+DrVenkman Posted September 4, 2020 Share Posted September 4, 2020 56 minutes ago, leech said: So trying to find the right 24pin 8kb chips. I bought these and they worked fine. I used a third one to put Altirra BASIC into a 600XL in place of the buggy Atari Rev B BASIC it came with. https://www.ebay.com/itm/STMicroelectronics-M27C64A-15F1-27C64-8K-x-8-UV-EPROM-CDIP28-x-1pc/150727709447?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted September 4, 2020 Share Posted September 4, 2020 @leech In your last motherboard photos above - your pictures show Jumpers on W6, W7, W8, W9. - which according to Bob's earlier post is the 24 pin/mask ROM config. When switching to the 28-pin eprom pair did you also set no jumper on W6, jumper on W11, W12, W13? Your AM2764-3DC's are 300ns, and seem really old, probably predating chip ID similar to 2732's. I can't figure out what the programming voltage is, but it's likely 21V or 25V, which the TL866 can't do. (It can get to about 16-18V which is enough for SOME 21V specced chips I've found... hit and miss) I'd recommend specifically seeking out DIP28 8KB EPROMS on the TL866 support list (and easily found on eBay) such as ST 27C64A, NSC NMC27C64Q, and AMD AM27C64A.The C = CMOS - basically means lower power needed, and more likely to be a more 'modern' 12-13V programming voltage. Also check out EEPROMs like AMD AM28C64A - these are cool because the TL866 can erase them with a single click. Saves lots of time when trying out different programming. All of those models I've successfully used with the TL866 v1... Quote Link to comment Share on other sites More sharing options...
leech Posted September 4, 2020 Share Posted September 4, 2020 1 hour ago, Nezgar said: @leech In your last motherboard photos above - your pictures show Jumpers on W6, W7, W8, W9. - which according to Bob's earlier post is the 24 pin/mask ROM config. When switching to the 28-pin eprom pair did you also set no jumper on W6, jumper on W11, W12, W13? Your AM2764-3DC's are 300ns, and seem really old, probably predating chip ID similar to 2732's. I can't figure out what the programming voltage is, but it's likely 21V or 25V, which the TL866 can't do. (It can get to about 16-18V which is enough for SOME 21V specced chips I've found... hit and miss) I'd recommend specifically seeking out DIP28 8KB EPROMS on the TL866 support list (and easily found on eBay) such as ST 27C64A, NSC NMC27C64Q, and AMD AM27C64A.The C = CMOS - basically means lower power needed, and more likely to be a more 'modern' 12-13V programming voltage. Also check out EEPROMs like AMD AM28C64A - these are cool because the TL866 can erase them with a single click. Saves lots of time when trying out different programming. All of those models I've successfully used with the TL866 v1... Awesome info, I ordered those based on one of the earlier lictures and wasn't aware of the difference between an AM2764-3DCand 2DC. The programmer I have is the TL866CS. I have now ordered the ones linked to by the Ghostbuster. As a side note: last night I was loming around with Shadow Memory in my Atari PC4 when a sales person knocked on my door. I should have opened the door with a quote from @DrVenkman "I'm right in the middle of something, Ray!" Quote Link to comment Share on other sites More sharing options...
+bob1200xl Posted September 29, 2020 Share Posted September 29, 2020 Are you still working on this? I'm going to do one of mine next week. Once I get it working, I can send you some EPROMs already programmed and tested. Bob Quote Link to comment Share on other sites More sharing options...
leech Posted September 29, 2020 Share Posted September 29, 2020 33 minutes ago, bob1200xl said: Are you still working on this? I'm going to do one of mine next week. Once I get it working, I can send you some EPROMs already programmed and tested. Bob That would be awesome. I got some various chips in, but haven't had the time to program them yet. Quote Link to comment Share on other sites More sharing options...
Mclaneinc Posted August 14, 2022 Share Posted August 14, 2022 Was there ever a win on this one? Quote Link to comment Share on other sites More sharing options...
leech Posted August 14, 2022 Share Posted August 14, 2022 5 hours ago, Mclaneinc said: Was there ever a win on this one? Ha, no it is sitting in a box somewhere. Quote Link to comment Share on other sites More sharing options...
Ricky Spanish Posted August 14, 2022 Share Posted August 14, 2022 5 hours ago, leech said: Ha, no it is sitting in a box somewhere The OS rev 11 chips? Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted February 3, 2023 Share Posted February 3, 2023 On 8/14/2022 at 1:02 PM, leech said: Ha, no it is sitting in a box somewhere. It still needs to escape the box, I hear it calling out in anguish 1 Quote Link to comment Share on other sites More sharing options...
leech Posted February 3, 2023 Share Posted February 3, 2023 On 8/14/2022 at 4:11 PM, Ricky Spanish said: The OS rev 11 chips? It's the 32 in 1 upgrade. Quote Link to comment Share on other sites More sharing options...
+bob1200xl Posted February 4, 2023 Share Posted February 4, 2023 It sounds like you have the Reset Problem. Easy Fix? Replace the 74LS14 at U16 with a 74AC14. Bob Quote Link to comment Share on other sites More sharing options...
leech Posted February 7, 2023 Share Posted February 7, 2023 On 2/3/2023 at 9:27 PM, bob1200xl said: It sounds like you have the Reset Problem. Easy Fix? Replace the 74LS14 at U16 with a 74AC14. Bob Hmm, I'd have to go digging for the upgrade, I know where the 1200xl is (in a pile of 8bits). Quote Link to comment Share on other sites More sharing options...
Ricky Spanish Posted April 12, 2023 Share Posted April 12, 2023 So.. who wants to burn a rev.11 HI/LO OS for this pilgrim ? Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted July 3, 2023 Share Posted July 3, 2023 On 6/12/2020 at 4:15 AM, Kyle22 said: Burn the latest XEGS OS on to a 27128, set a few jumpers, add one wire, and you can put BASIC in the other socket. Simple. Follow the first part of Bob Woolley's excellent instructions. First half of instructions pasted below: A Parallel Bus Interface for your 1200XL [...] Do the simple mods, replace OS and MMU. Put BASIC in the other socket. Simple. Do you know if it's possible to take an XL ROM image (16KB), divide it into two halves, burn them into two 64Kbit EPROMS and just install them instead of the original ones (adjusting the W-jumpers of course)? So to do an upgrade like with the rev.11 version but using a more modern ROM? Without replacing the MMU nor jumper wires? Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted July 3, 2023 Share Posted July 3, 2023 1 Quote Link to comment Share on other sites More sharing options...
ACML Posted July 4, 2023 Share Posted July 4, 2023 On 7/3/2023 at 3:54 AM, Peri Noid said: Do you know if it's possible to take an XL ROM image (16KB), divide it into two halves, burn them into two 64Kbit EPROMS and just install them instead of the original ones (adjusting the W-jumpers of course)? So to do an upgrade like with the rev.11 version but using a more modern ROM? Without replacing the MMU nor jumper wires? Here is an alterative. Quote Link to comment Share on other sites More sharing options...
leech Posted July 4, 2023 Share Posted July 4, 2023 6 minutes ago, ACML said: Here is an alterative. Has anyone hacked the cool logo from the Rev11 OS into other OS versions? Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 4, 2023 Share Posted July 4, 2023 1 hour ago, leech said: Has anyone hacked the cool logo from the Rev11 OS into other OS versions? I took an XL OS, made a lot of changes, and put the Atari Logo on it for an 800. It needs a ROM card that allows for ROM in the $C000-$CFFF range in order to function. My RAMROM 2022 card and a Newell card would allow for this. 1 Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted July 4, 2023 Share Posted July 4, 2023 1 hour ago, leech said: Has anyone hacked the cool logo from the Rev11 OS into other OS versions? @Stephen did something a couple years back ... 2 1 Quote Link to comment Share on other sites More sharing options...
leech Posted July 4, 2023 Share Posted July 4, 2023 14 minutes ago, DrVenkman said: @Stephen did something a couple years back ... Ha, I often wonder how many different Atari 8bits people have... first you make me jealous over your 1088XEL, and now the 576NUC+? (I swear I don't need another 8bit computer... but so tempted...) Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted July 4, 2023 Share Posted July 4, 2023 14 minutes ago, leech said: first you make me jealous over your 1088XEL, and now the 576NUC+? (I swear I don't need another 8bit computer... but so tempted...) It was a fun but challenging build - I'm not a fan of SMD stuff, lol. Anyway, there's also the 1088XLD you could build if you have a spare 1050 case handy. Quote Link to comment Share on other sites More sharing options...
janzh Posted July 5, 2023 Share Posted July 5, 2023 I have added Fuji. https://github.com/HolgerJanz/BW-DOS/blob/main/1.4/SOURCES/EXT_CMD/SELFTEST.ASM 1 Quote Link to comment Share on other sites More sharing options...
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