{"id":6231,"date":"2023-03-11T17:18:46","date_gmt":"2023-03-11T17:18:46","guid":{"rendered":"https:\/\/loadzx.com\/timexcomputerworld\/?page_id=6231"},"modified":"2023-12-15T18:53:47","modified_gmt":"2023-12-15T18:53:47","slug":"ti-technical-info","status":"publish","type":"page","link":"https:\/\/loadzx.com\/timexcomputerworld\/ti-technical-info\/","title":{"rendered":"TI &#8211; Technical Info"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"6231\" class=\"elementor elementor-6231\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-8c07a5d elementor-section-stretched elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"18794\" data-id=\"8c07a5d\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-080594e\" data-eae-slider=\"9438\" data-id=\"080594e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-inner-section elementor-element elementor-element-690fb63 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"49995\" data-id=\"690fb63\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-dc84625\" data-eae-slider=\"80393\" data-id=\"dc84625\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ef3ff72 elementor-widget elementor-widget-heading\" data-id=\"ef3ff72\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">TI - Technical Info<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c6dbe92 elementor-widget elementor-widget-spacer\" data-id=\"c6dbe92\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d7aef14 elementor-widget elementor-widget-image\" data-id=\"d7aef14\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"829\" src=\"https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/ti1-1024x829.jpg\" class=\"attachment-large size-large wp-image-5984\" alt=\"\" srcset=\"https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/ti1-1024x829.jpg 1024w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/ti1-300x243.jpg 300w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/ti1-768x621.jpg 768w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/ti1-1536x1243.jpg 1536w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/ti1-2048x1657.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3666a51 elementor-widget elementor-widget-spacer\" data-id=\"3666a51\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-19a0801 elementor-widget elementor-widget-text-editor\" data-id=\"19a0801\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>TMX Portugal has done two versions of the FDD interface: one for TC2048 (can be used with TC2068 with emulator cartridge) and one for TC2068 (this version, the reset button is silver. The rest is equal). This is because FDD interface ROM initialization works with the computer ROM. If the right version of the FDD interface isn&#8217;t used with the computer it was designed for, the computer simply crashes.<\/p><p><strong>The FDD Interface<br \/><\/strong><strong>Author of this text: Jarek Adamski<\/strong><\/p><p>FDD 3000 communicates through the FDD interface. The interface has one connection for Edge Connector and on the other side, has the connector to FDD. So you can use any type of FDD interface for any type of FDD 3000. For ZX&#8217;s who have 128 FDD interface requires special Eprom reprogramming (port conflict). Only FDD interfaces from STAVI are free of that bug.<\/p><p>FDD 3000 is connected to the FDD interface through spiral cable, the transfer is half duplex 6 bit ( 1 bit is STROBE, all bits can be used normally) which gives a low transfer rate.<\/p><p>The FDD interface is not a complex unit. Port accesible by out\/in #EF.<\/p><p>Inside FDD is it port #0F, and MIRRORED: #2F, #4F, #6F, #8F, #AF, #CF, #EF.<\/p><p>Ports are connected this way: (TI BIT n MEAN BIT in Timex Interface #ef)\u00a0<\/p><p>BIT READ WRITE NOTE<br \/><span style=\"font-size: 18px;\">7 DREQ FDC 1772 ?\u00a0<br \/><\/span><span style=\"font-size: 18px;\">6 TI BIT 6 TI BIT 6<br \/><\/span><span style=\"font-size: 18px;\">5 DREQ FDC 1772 ?\u00a0<br \/><\/span><span style=\"font-size: 18px;\">4 TI BIT 4 OR 7 TI BIT 4 OR 7 DEPENDS ON TI VERSION&#8230; STANDARD IS 4<br \/><\/span><span style=\"font-size: 18px;\">3 TI BIT 3 TI BIT 3<br \/><\/span><span style=\"font-size: 18px;\">2 TI BIT 2 TI BIT 2<br \/><\/span><span style=\"font-size: 18px;\">1 TI BIT 1 TI BIT 1<br \/><\/span><span style=\"font-size: 18px;\">0 TI BIT 0 TI BIT 0<\/span><\/p><p>The interface has also a RESET switch, and an amplifier of the CV signal, which is more <span style=\"font-size: 18px;\">accessible than at TIMEX FDD 3000 at MONITOR output (chinch). It has a lot <\/span><span style=\"font-size: 18px;\">of interferences (TTL signals in spiral cable, no shield, 1 meter long.)<\/span><\/p><p><strong>But What is inside?<\/strong><\/p><p>INSIDE FDD &#8211; PORTS, and SHORT this PORT INSIDE CHIP STERRED WHAT IT DO?<\/p><ul><li>#10 WD2123 configuration (write) CHA<\/li><li>#11 WD2123 configuration (write) CHB<\/li><li>#40 WD2123 data CHB<\/li><li>#41 WD2123 status\/command CHB<\/li><li>#80 WD2123 data CHA<\/li><li>#81 WD2123 status\/command CHA<\/li><li>#C0 FDC1770 steering port\/status<\/li><li>#C1 FDC1770 track port<\/li><li>#C2 FDC1770 sector port<\/li><li>#C3 FDC1770 data port<\/li><li>#E0 HELPING helping port(below)<\/li><\/ul><p><strong>How to use these ports? I still wait for the info&#8230; but : PORT #E0<\/strong><\/p><p>BIT WRITE 1 0<br \/><span style=\"font-size: 18px;\">7 HEAD DOWN UP<br \/><\/span><span style=\"font-size: 18px;\">6 #0000-#1FFF ROM RAM<br \/><\/span><span style=\"font-size: 18px;\">5 DENSITY FM MFM<br \/><\/span><span style=\"font-size: 18px;\">4 SIDE 1 0<br \/><\/span><span style=\"font-size: 18px;\">3 DRIVE 3 ON OFF<br \/><\/span><span style=\"font-size: 18px;\">2 DRIVE 2 ON OFF<br \/><\/span><span style=\"font-size: 18px;\">1 DRIVE 1 ON OFF<br \/><\/span><span style=\"font-size: 18px;\">0 DRIVE 0 ON OFF<\/span><\/p><p><strong>Interface structure.<\/strong><\/p><p>The interface looks like this:\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ed9aa1d elementor-widget elementor-widget-image\" data-id=\"ed9aa1d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"448\" src=\"https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/tiinside-1024x448.jpg\" class=\"attachment-large size-large wp-image-6713\" alt=\"\" srcset=\"https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/tiinside-1024x448.jpg 1024w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/tiinside-300x131.jpg 300w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/tiinside-768x336.jpg 768w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/tiinside-1536x672.jpg 1536w, https:\/\/loadzx.com\/timexcomputerworld\/wp-content\/uploads\/2023\/03\/tiinside-2048x897.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-46b14b9 elementor-widget elementor-widget-text-editor\" data-id=\"46b14b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>On the top is a connector to the real FDD 3000\/3 below you have RAM, below EPROM, <span style=\"font-size: 18px;\">and from the top right: two line buffers. and 2 GAL&#8217;s (dolny\/gorny). <\/span><span style=\"font-size: 18px;\">On the bottom, you have an edge connector.<\/span><\/p><p>The description of TIMEX INTERFACE, which is used to connect the computer with a ZX SPECTRUM compatible edge connector to the TIMEX FDD 3000 or Unipolbrit clones.<\/p><p><strong>Interface decodes addresses:<\/strong><\/p><p>memory : #0000 and #0008 with _M1 active &#8211; disconnection of ZX ROM.<br \/><span style=\"font-size: 18px;\">memory : #0604 with _M1 &#8211; reconnection of ZX ROM<br \/><\/span><span style=\"font-size: 18px;\">port #xxEF &#8211; input\/output 8 bit.<\/span><\/p><p>After disconnection of ZX ROM interface connect his memory in the areas :<\/p><p>#0000..#1FFF TI (Timex Interface) ROM (4KB, two times)<br \/><span style=\"font-size: 18px;\">#2000..#3FFF TI RAM (1KB eight times or 2KB four times)<\/span><\/p><p>(1) TI (Timex Interface) with double-sided PCB painted at the bottom on the green, without any numbers, at the bottom (lower side) at the center of the &#8220;SER&#8221; sign.<\/p><p>Components : (IC1)TMM2016 (RAM), (IC2)D2732D (ROM), (IC5)SN74LS273N (output line driver), (IC6)HD74LS244P (input line driver), (C1)473\/50V, (C2)ASE4832ZIB, (D1)1N4148R, (R1)680ohm 5%, microswitch black, edge connector ZX, and DA15M\u00a0 connector.<\/p><p>Rewired connections under PAL components.<\/p><p>In the DA15M pins 7 and 8 are not connected. Mask of the connector: %11001111, Bits 4 and 5 not connected to 244 and 273 &#8211; in the reading state is not known. (recommended &#8211; connecting them to the unused 244 outputs, and the corresponding 244 inputs &#8211; to the ground)<\/p><p>(2) TI with double-sided glass laminate, yellow color, without numbers, and the visible manufacturer signs, the side holes are circular.<\/p><p>Elements: TMM2016, D2732D, SN74LS273N, SN74LS244N, (2x)+2.2\/+25V(C), 22uF\/25V, DA9C38(T), microswitch white, edge connector ZX to the soldiering, DA15M.<\/p><p>Unused inputs 244 and 273 are connected to the ground thru wires.<\/p><p>In the DA15M pins 7 and 8 are not connected and cutted. Mask of the connector: %11001111.<\/p><p>Bits 4 and 5 are connected thru wires to 244 &#8211; low state when read.<\/p><p>GAL (PAL, PALCE) chips 16V8 are connected so:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-16c6cb8 elementor-widget elementor-widget-text-editor\" data-id=\"16c6cb8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-family: 'Times New Roman'; font-size: medium; font-style: normal; font-weight: 400;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0__\u00a0 __\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 __\u00a0 __<\/span><br style=\"font-family: 'Times New Roman'; font-size: medium;\" \/><span style=\"font-style: normal; font-weight: 400; font-family: Courier; font-size: large;\"><strong>-\\\u00a0\u00a0\u00a0 CLK\u00a0\u00a0 Io \\\/\u00a0 | +5V\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 A12\u00a0\u00a0 Io \\\/\u00a0 | +5V\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/-<br \/>\u00a0|\u00a0\u00a0\u00a0 A14\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 I \/L3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/IORQ I\u00a0\u00a0\u00a0\u00a0\u00a0 O \/IN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |F<br \/>Z|\u00a0\u00a0\u00a0 A13\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 O CLK\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/RD\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 I A0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |D<br \/>X|\u00a0\u00a0\u00a0 A10\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 I A15\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 A8\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 I \/WR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |D<br \/>\u00a0|\u00a0\u00a0\u00a0 A9\u00a0\u00a0\u00a0 I IC3\u00a0 O \/ROM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 A11\u00a0\u00a0 I IC4\u00a0 | nc (A1)\u00a0\u00a0 |<br \/>B|\u00a0\u00a0\u00a0 A3\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 O \/RAM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 A7\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 O \/L3\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |3<br \/>u|\u00a0\u00a0\u00a0 A2\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 I \/L2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 A6\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 O \/L2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |0<br \/>s|\u00a0\u00a0\u00a0 \/MREQ I\u00a0\u00a0\u00a0\u00a0\u00a0 O \/L1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 A5\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 I \/L1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |0<br \/>\u00a0|\u00a0\u00a0\u00a0 \/M1\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 O ZXDIS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 A4\u00a0\u00a0\u00a0 I\u00a0\u00a0\u00a0\u00a0\u00a0 O \/OUT\u00a0\u00a0\u00a0\u00a0\u00a0 |0<br \/>-\/\u00a0\u00a0\u00a0 GND\u00a0\u00a0 |______I GND\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 GND\u00a0\u00a0 |______I A1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \\-<\/strong><\/span><br style=\"font-family: 'Times New Roman'; font-size: medium;\" \/><span style=\"font-family: 'Times New Roman'; font-size: medium; font-style: normal; font-weight: 400;\">\u00a0<\/span><br style=\"font-family: 'Times New Roman'; font-size: medium;\" \/><br style=\"font-family: 'Times New Roman'; font-size: medium;\" \/><span style=\"font-style: normal; font-weight: 400; font-family: Courier; font-size: large;\"><strong>CPU inputs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : A0..A15, \/IORQ, \/M1, \/MREQ, \/RD, \/WR<br \/>Power\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0: GND, +5V<br \/>TI sterring\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0: \/IN\u00a0 &#8211; read from port #EF (74244, pin 1 &amp; 19)<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/OUT &#8211; write to port #EF (74273, pin 11)<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/RAM &#8211; activate TI RAM\u00a0\u00a0 (2016, pin 18 &amp; 20)<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\/ROM &#8211; activate TI ROM\u00a0\u00a0 (2732D, pin 18 &amp; 20)<br \/>ZX sterring\u00a0\u00a0\u00a0\u00a0\u00a0 : ZXDIS &#8211; thru 680om to +5V, thru diode to \/ROMCS<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0(or to the transistor base in the same purpose)<br \/>local connections : CLK, \/L1, \/L2, \/L3<br \/>Other\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0: nc &#8211; not connected inside the chip.<\/strong><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d8e6ab7 elementor-widget elementor-widget-text-editor\" data-id=\"d8e6ab7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Direction, purpose, and polarisation of CLK, \/L1, \/L2, \/L3 signals are taken freely and can vary between particular versions. This doesn&#8217;t matter, as long as both PALs are programmed together (they must cooperate).<\/p><p>IC3 signals:<br \/>ZXDIS := \/A9<br \/>(high state on the D of the latch only for addresses which disconnects ZX ROM: #0000 and #0008 &#8211; in real life (CLK signal coding) \/A9 is enough.)<\/p><p>L1 = A2 * A3<br \/>(output inverted &#8211; low state on \/L1 for the #xxEF port address)<\/p><p>RAM = ZXDIS * A13 * \/A14 * \/A15 * MREQ<br \/>(output inverted &#8211; low state on \/RAM, if ZX ROM is disconnected and memory #2000..#3FFF addressed)<\/p><p>ROM = ZXDIS * \/A13 * \/A14 * \/A15 * MREQ * RD<br \/>(output inverted &#8211; low state on \/ROM if ZX ROM disconnected and memory #0000..#1FFF is addressed for reading)<\/p><p>CLK = L2 * \/A3 * \/A9 * \/A10 * \/A13 * \/A14 * \/A15 * MREQ * M1<br \/>+ L3 * \/A2 * \/A3 * A9 * A10 * \/A13 * \/A14 * \/A15 * MREQ * M1<br \/>(high state for the instruction getting from addresses switching ZX ROM)<\/p><p>IC4 signals:<br \/>OUT = L1 * A0 * A1 * \/A4 * A5 * A6 * A7 * IORQ * WR<br \/>(output inverted &#8211; low state on \/OUT for #xxEF port address for writing)<\/p><p>L2 = \/A0 * \/A1 * \/A4 * \/A5 * \/A6 * \/A7 * \/A8 * \/A11 * \/A12<br \/>(output inverted &#8211; low state on \/L2 for #0000 and #0008)<\/p><p>L3 = \/A0 * A1 * \/A4 * \/A5 * \/A6 * \/A7 * \/A8 * \/A11 * \/A12<br \/>(output inverted &#8211; low state on \/L3 for address #0604)<\/p><p>IN = L1 * A0 * A1 * \/A4 * A5 * A6 * A7 * IORQ * RD<br \/>(output inverted &#8211; low state on \/IN for #EF port address for reading)<\/p><p>&#8220;output inverted&#8221; in the description means a lack of signal negation on the XOR gate, done by bits SL1n=0<\/p><p>The type of connection should be checked with the above description. All modifications should be done on the circuit board(PCB).<\/p><p><strong>Timex FDD with ZX Spectrum 128K (Plus\/Plus 2\/Plus 3\/Plus 2A\/B)<\/strong><\/p><p>The Timex FDD can work with the 128K versions of ZX Spectrum. To use the Timex FDD the ROM in the FDD interface must be replaced because a part of ROM1 is used to reset the Spectrum. In case the 128K code is taken from ROM0, results in a crash.<\/p><p>So to the 128K and 128K+2, the FDD interface must perform an OUT #7FFD,#10 before initialization. This change was made by STAVI in Poland.<\/p><p>To work with ZX Spectrum 128K Plus 3, except the \/ROMCS fix, an OUT #1FFD,#04 must be performed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d571d25 elementor-widget elementor-widget-spacer\" data-id=\"d571d25\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62143a6 elementor-widget elementor-widget-spacer\" data-id=\"62143a6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-454c18d elementor-widget elementor-widget-spacer\" data-id=\"454c18d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8086521 elementor-widget elementor-widget-html\" data-id=\"8086521\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<a class=\"top-link hide\" href=\"\" id=\"js-top\">\r\n  <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 12 6\"><path d=\"M12 6H0l6-6z\"\/><\/svg>\r\n  <span class=\"screen-reader-text\">Back to top<\/span>\r\n<\/a>\r\n\r\n<style>\r\n\r\n\r\n.intro-copy {\r\n  padding: 1em;\r\n  margin: 50vh auto;\r\n  max-width: 15em;\r\n  font-family: Helvetica;\r\n  font-weight: lighter;\r\n  font-size: 2em;\r\n  line-height: 1.2;\r\n  text-align: center;\r\n}\r\n\r\n.top-link {\r\n    z-index: 99999;\r\n  transition: all .25s ease-in-out;\r\n  position: fixed;\r\n  bottom: 0;\r\n  right: 0;\r\n  display: inline-flex;\r\n  cursor: pointer;\r\n  align-items: center;\r\n  justify-content: center;\r\n  margin: 0 3em 3em 0;\r\n  border-radius: 50%;\r\n  padding: .25em;\r\n  width: 50px;\r\n  height: 50px;\r\n  background-color: #F8F8F8;\r\n}\r\n.top-link.show {\r\n  visibility: visible;\r\n  opacity: 1;\r\n}\r\n.top-link.hide {\r\n  visibility: hidden;\r\n  opacity: 0;\r\n}\r\n.top-link svg {\r\n  fill: #000;\r\n  width: 24px;\r\n  height: 12px;\r\n}\r\n.top-link:hover {\r\n  background-color: #E8E8E8;\r\n}\r\n.top-link:hover svg {\r\n  fill: #000000;\r\n}\r\n\r\n.screen-reader-text {\r\n  position: absolute;\r\n  clip-path: inset(50%);\r\n  margin: -1px;\r\n  border: 0;\r\n  padding: 0;\r\n  width: 1px;\r\n  height: 1px;\r\n  overflow: hidden;\r\n  word-wrap: normal !important;\r\n  clip: rect(1px, 1px, 1px, 1px);\r\n}\r\n.screen-reader-text:focus {\r\n  display: block;\r\n  top: 5px;\r\n  left: 5px;\r\n  z-index: 100000;\r\n  clip-path: none;\r\n  background-color: #eee;\r\n  padding: 15px 23px 14px;\r\n  width: auto;\r\n  height: auto;\r\n  text-decoration: none;\r\n  line-height: normal;\r\n  color: #444;\r\n  font-size: 1em;\r\n  clip: auto !important;\r\n}\r\n<\/style>\r\n\r\n<script>\r\n    \/\/ Set a variable for our button element.\r\nconst scrollToTopButton = document.getElementById('js-top');\r\n\r\n\/\/ Let's set up a function that shows our scroll-to-top button if we scroll beyond the height of the initial window.\r\nconst scrollFunc = () => {\r\n  \/\/ Get the current scroll value\r\n  let y = window.scrollY;\r\n  \r\n  \/\/ If the scroll value is greater than the window height, let's add a class to the scroll-to-top button to show it!\r\n  if (y > 0) {\r\n    scrollToTopButton.className = \"top-link show\";\r\n  } else {\r\n    scrollToTopButton.className = \"top-link hide\";\r\n  }\r\n};\r\n\r\nwindow.addEventListener(\"scroll\", scrollFunc);\r\n\r\nconst scrollToTop = () => {\r\n  \/\/ Let's set a variable for the number of pixels we are from the top of the document.\r\n  const c = document.documentElement.scrollTop || document.body.scrollTop;\r\n  \r\n  \/\/ If that number is greater than 0, we'll scroll back to 0, or the top of the document.\r\n  \/\/ We'll also animate that scroll with requestAnimationFrame:\r\n  \/\/ https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/window\/requestAnimationFrame\r\n  if (c > 0) {\r\n    window.requestAnimationFrame(scrollToTop);\r\n    \/\/ ScrollTo takes an x and a y coordinate.\r\n    \/\/ Increase the '10' value to get a smoother\/slower scroll!\r\n    window.scrollTo(0, c - c \/ 10);\r\n  }\r\n};\r\n\r\n\/\/ When the button is clicked, run our ScrolltoTop function above!\r\nscrollToTopButton.onclick = function(e) {\r\n  e.preventDefault();\r\n  scrollToTop();\r\n}\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c5c47a0 elementor-widget elementor-widget-spacer\" data-id=\"c5c47a0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>TI &#8211; Technical Info TMX Portugal has done two versions of the FDD interface: one for TC2048 (can be used with TC2068 with emulator cartridge) and one for TC2068 (this version, the reset button is silver. The rest is equal). This is because FDD interface ROM initialization works with the computer ROM. If the right [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"enabled","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"wf_page_folders":[17],"class_list":["post-6231","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>TI - Technical Info - LOAD ZX - TIMEX COMPUTER World<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/loadzx.com\/timexcomputerworld\/ti-technical-info\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TI - Technical Info - LOAD ZX - TIMEX COMPUTER World\" \/>\n<meta property=\"og:description\" content=\"TI &#8211; Technical Info TMX Portugal has done two versions of the FDD interface: one for TC2048 (can be used with TC2068 with emulator cartridge) and one for TC2068 (this version, the reset button is silver. 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The rest is equal). This is because FDD interface ROM initialization works with the computer ROM. 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