Jim Patchell Posted November 28, 2014 Share Posted November 28, 2014 I decided it might be fun to reverse the ATR8000. The schematic really sucks, at least, by todays standards. My first step is to redraw the schematic. The copy I have is a Rev C. Were there any other revs? The second question is, does any body know the bit pattern in U46. This part is a 32x8 prom. But only 16x4 of it is being used. It would be nice if somebody has already done this, but I will get it myself if I have to. Just for fun, here is the image of the Data Separator for the ATR8000. 3 Quote Link to comment Share on other sites More sharing options...
+warerat Posted November 28, 2014 Share Posted November 28, 2014 Hi Jim, I have the bit sequence and equivalent GAL equations for this PROM. Only 16 bytes are used. I am out of state for Thanksgiving but will post them when I get back tomorrow or maybe someone can beat me to it. 1 Quote Link to comment Share on other sites More sharing options...
Jim Patchell Posted November 29, 2014 Author Share Posted November 29, 2014 Pal equations will be Great! Thanks. -Jim Quote Link to comment Share on other sites More sharing options...
+warerat Posted November 29, 2014 Share Posted November 29, 2014 The nibble data from low-to-high order addresses is: $1, $1, $3, $2, $4, $3, $5, $4, $e, $e, $e, $e, $f, $f, $1, $0 D0 => !A1 & !A2 & !A3 # !A0 & A1 & !A3 # !A0 & A2 & A3 # A0 & !A1 & A2 D1 => !A0 & !A1 & A2 & A3 # A1 & !A2 # A0 & !A1 & A2 # !A1 & !A2 & A3 D2 => A1 & !A2 & A3 # !A0 & A2 & !A3 # A0 & A1 & A2 & !A3 # !A1 & A3 D3 => A1 & !A2 & A3 # !A1 & A3 1 Quote Link to comment Share on other sites More sharing options...
Jim Patchell Posted November 30, 2014 Author Share Posted November 30, 2014 Thank you very much. This simplifies things a lot. Quote Link to comment Share on other sites More sharing options...
Jim Patchell Posted December 1, 2014 Author Share Posted December 1, 2014 I have updated the drawing, with the supplied info. See Above. I am working on getting the whole schematic redrawn. Quote Link to comment Share on other sites More sharing options...
+Larry Posted December 1, 2014 Share Posted December 1, 2014 Maybe a new pcb could be somewhat smaller... -Larry 2 Quote Link to comment Share on other sites More sharing options...
Jim Patchell Posted December 2, 2014 Author Share Posted December 2, 2014 Ultimate goal is to put the whole thing into an FPGA. 1 Quote Link to comment Share on other sites More sharing options...
Bill Lange Posted December 2, 2014 Share Posted December 2, 2014 Found this ad in Analog #20 Quote Link to comment Share on other sites More sharing options...
Defender II Posted December 2, 2014 Share Posted December 2, 2014 Do the ATR8500 with Hard Drive support. Quote Link to comment Share on other sites More sharing options...
TXG/MNX Posted December 3, 2014 Share Posted December 3, 2014 Yep 8500 sound nice never saw info/pics abput that Quote Link to comment Share on other sites More sharing options...
ricortes Posted December 4, 2014 Share Posted December 4, 2014 For some reason I thought the 8500 needed a co-power88 board to work. Can anyone confirm this? I also thought the 8500 was scsi so a bit hard to find drives nowadays. hehe a bit hard to find floppies too! Quote Link to comment Share on other sites More sharing options...
Subby Posted December 7, 2014 Share Posted December 7, 2014 Now there is something that needs to be duplicated, the Co-Power88 board. Quote Link to comment Share on other sites More sharing options...
tschak909 Posted December 8, 2014 Share Posted December 8, 2014 As someone who actually had one: It's like every other modicum of MS-DOS compatibility from 1982 to 1984...it's OS compatible, not hardware compatible, IBM PC stuff which addresses hardware directly (Lotus 1-2-3) will not work. The advantage to have one, seriously, is for the RAMDISK. -Thom Quote Link to comment Share on other sites More sharing options...
ricortes Posted December 8, 2014 Share Posted December 8, 2014 Well, it is a hobby! If only I had a Co-Power88. I could use it to run a CP/M emulator that would run a 6502 emulator that would run a Z-machine interpreter and play Zork.<sic> I had a Sanyo MBC550<?> back in the day. Even belonged to a user group. Fortunately the guy who ran the user group was no small genius who patched everything to work with our hardware. Soon as I got a clone that had better compatibility I gave the Sanyo to my kids. I think I had absconded with one of the disk drives from the Sanyo for another project so just used electrical tape to cover the hole. After several months I got a report back that the computer was no longer working. I opened it up and my kids had shoved a sandwich through the electrical tape and into the computer. I'm not sure, I think they also shoved a VHS tape in there. Expecting to watch a video I imagine. I never fixed it but may have a copy of MS DOS 1.1ish for the Sanyo laying around on a 160k floppy somewhere. Using those loosely compatibles was not that horrible. They all ran WordStar and had some level of floppy compatibility. I think I still have a version of LISP for the machine too. 2 Quote Link to comment Share on other sites More sharing options...
+warerat Posted December 9, 2014 Share Posted December 9, 2014 All this talk about the Co-Power made me pull mine out. My ATR-8000 came equipped with the Co-Power Plus with 1MB of memory. This board and the regulator are mounted below the Z80 motherboard. It's a pretty simple setup and would be trivial to reproduce with a handful of ICs, a CPLD, and some SRAM. Unfortunately I don't have CP/M up and running to test it. 2 Quote Link to comment Share on other sites More sharing options...
pixelmischief Posted December 9, 2014 Share Posted December 9, 2014 All this talk about the Co-Power made me pull mine out. Whoa, dude. Put that away. There's kids. Quote Link to comment Share on other sites More sharing options...
+Stephen Posted December 9, 2014 Share Posted December 9, 2014 Whoa, dude. Put that away. There's kids. That thing's bigger than a pay-phone, smaller than a Cadillac Quote Link to comment Share on other sites More sharing options...
TheEditor Posted December 9, 2014 Share Posted December 9, 2014 Not sure if it will help but I found quite a bit of info on the ATR8000 on this page, http://blog.3b2.sk/igi/post/ATR-8000.aspx There is also a link for schematics, I have not looked yet to see how indepth they may be. 2 Quote Link to comment Share on other sites More sharing options...
Wally1 Posted December 11, 2014 Share Posted December 11, 2014 best of luck with this...looking forward to it! Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted December 19, 2014 Share Posted December 19, 2014 Very nice link! Useful! Quote Link to comment Share on other sites More sharing options...
Defender II Posted December 19, 2014 Share Posted December 19, 2014 All this talk about the Co-Power made me pull mine out. My ATR-8000 came equipped with the Co-Power Plus with 1MB of memory. This board and the regulator are mounted below the Z80 motherboard. It's a pretty simple setup and would be trivial to reproduce with a handful of ICs, a CPLD, and some SRAM. Unfortunately I don't have CP/M up and running to test it. Nice Co-Power II/Plus board. Quote Link to comment Share on other sites More sharing options...
evilmoo Posted December 19, 2014 Share Posted December 19, 2014 All this talk about the Co-Power made me pull mine out. Can you dump that ROM chip? Quote Link to comment Share on other sites More sharing options...
+warerat Posted December 19, 2014 Share Posted December 19, 2014 Can you dump that ROM chip? Yep.. This goes on a 2732, but really only about 1.5K is used. SWP_8088.ROM Quote Link to comment Share on other sites More sharing options...
Almost Rice Posted December 22, 2014 Share Posted December 22, 2014 wow, I just notice the address. I will be in that area in a couple days. I'll stop and take some pictures. Quote Link to comment Share on other sites More sharing options...
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