Ian Primus Posted October 18, 2003 Share Posted October 18, 2003 I just finished repairing my EPROM programmer, and I am eager to try it out. I want to make an EPROM cart, but I seem to have forgotten how, and I can't find the schematics I printed out way back when. I remember that Hozer Video games used to have instructions on their site, but it seems that Hozer is no longer in business (or at least, his site is down). Anyone have some decent schematics or instructions for wiring up the 7404 and 2732? What about using larger EPROMs as 4k? I have a large pile of 27256 and 27512 EPROMs, and I wouls assume that there shouldn't be any problem just programming the first 4k, and not connecting the higher address lines. Also, I would like to make a couple of 8k carts, anyone happen to have information on the bank switching? I know F8 bank switching was pretty common, but for the life of me, I can't remember how to do it. Thanks! Ian Primus ian_primus@yahoo.com Quote Link to comment Share on other sites More sharing options...
Cupcakus Posted October 18, 2003 Share Posted October 18, 2003 it's been a while for me as well... but if I remember correctly the pinout is similar, however you have to gnd the /WE and invert the /CE on the EPROM. Larger EPROM's can work, but the extra address lines have to be grounded some how, and the other lines have to be soldered to the PCB correctly. Your best bet is probably to get one of the Pixels Past PCB's here on AA which are all set for the 4k EPROM and inverter. --Chris Quote Link to comment Share on other sites More sharing options...
Cupcakus Posted October 18, 2003 Share Posted October 18, 2003 Found my notes from when I was designing the flash cart, hope this helps. Cartridge Pins From The Front Left to Right (PROM facing up) 1 -> Q3 2 -> Q4 3 -> Q5 4 -> Q6 5 -> Q7 6 -> /CE (Inverted) 7 -> A10 8 -> A11 9 -> A9 10 -> A8 11 -> Vcc 12 -> GND Back (Pins from the back, left to right if back side is facing you, or right to left if front side is facing you) 12 -> A7 11 -> A6 10 -> A5 9 -> A4 8 -> A3 7 -> A2 6 -> A1 5 -> A0 4 -> Q0 3 -> Q1 2 -> Q2 1 -> Prom GND (Pin 12) /OE goes to GND Quote Link to comment Share on other sites More sharing options...
Ian Primus Posted October 18, 2003 Author Share Posted October 18, 2003 Thanks for the help. I managed to get a cartridge working this morning. I took a Pac-Man, and desoldered the old PROM chip, and installed a socket, and modified the traces on the board and added a 7404. It worked first try. I have made this into a "test cartridge", by cutting a hole through the cartridge casing and stacking another socket on the first one so that it comes up flush with the cartridge casing. I'll post pictures soon. Now, if only I could figure out the wiring for F8 bank switching. Ian Primus ian_primus@yahoo.com Quote Link to comment Share on other sites More sharing options...
Cassidy Nolen Posted October 18, 2003 Share Posted October 18, 2003 I typed this up on my site, no pics, but it does the job.... http://www.atarionline.com/ataricart.html HTH, but looks like you already have it all down.. Cassidy Quote Link to comment Share on other sites More sharing options...
jsoper Posted October 18, 2003 Share Posted October 18, 2003 Now, if only I could figure out the wiring for F8 bank switching. www94.pair.com/jsoper has F8, F6, and Parker Bros theory and circuits. I'm gonna do Tigervision too one of these days. It also has links to buy the Pixel's Past pre-made boards. Quote Link to comment Share on other sites More sharing options...
maximebeauvais Posted October 20, 2003 Share Posted October 20, 2003 http://www.atarionline.com/ataricart.html Great job Quote Link to comment Share on other sites More sharing options...
san-d-2000 Posted October 20, 2003 Share Posted October 20, 2003 Maybe a ignorent question, but my girlfriends father is going to burn me some 2 and 4 k games onto Eproms, and he asked me the burn settings he said he could burn the rom in 20 different ways Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted October 20, 2003 Share Posted October 20, 2003 Maybe a ignorent question, but my girlfriends father is going to burn me some 2 and 4 k games onto Eproms, and he asked me the burn settings he said he could burn the rom in 20 different ways Does that mean you don't need me to do it for you anymore ? Quote Link to comment Share on other sites More sharing options...
san-d-2000 Posted October 20, 2003 Share Posted October 20, 2003 @ CPUWIZ nope not at all unless you dont want to ofcourse Quote Link to comment Share on other sites More sharing options...
jsoper Posted October 20, 2003 Share Posted October 20, 2003 Maybe a ignorent question, but my girlfriends father is going to burn me some 2 and 4 k games onto Eproms, and he asked me the burn settings he said he could burn the rom in 20 different ways Not quite sure what he means, but one thing that might help is doubling the 2k roms up so they are 4k, which is what most people do. You could leave the A11 line open, but it's easier to just treat it like a 4k rom. Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted October 20, 2003 Share Posted October 20, 2003 It may very well be an older EPROM programmer and he is talking about the various voltage and timing settings. @san-d-2000: If he is burning you some, why do you want me to do it as well ? Quote Link to comment Share on other sites More sharing options...
san-d-2000 Posted October 20, 2003 Share Posted October 20, 2003 Well he already burnt me one and it didn´t work so we sort of gave up on the project Quote Link to comment Share on other sites More sharing options...
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