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Atari 1200XL REV 11 OS install

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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

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@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...

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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!"

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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

 

 

 

 

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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.

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