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kreats

Micron Xceed docs on ebay

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The only thing I can add, is the XCEED I found had some QC markings on the chips.  The Micron GAM 0398 AIS has a sticker that says "grayscale OK", and the Bt473KPJ80 has the resolutions written on it.

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trag, thanks for uploading your floppy! The software is as important as the hardware design. And the source code can give some clues into the hardware as well.

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Well that brings back memories. That's the thread that ultimately led to Gamba and me collaborating on the IIci ROM for SE/30.

 

Trag - saw you in there, wasn't trying to call you out. If anything, that thread is a little hard to read so I couldn't tell who knew what. Thanks for your honest reply and thanks for digging through the sticky black tar of memories about something you wrote years ago. Thanks for the floppy image, too.

 

The Vintage Mac wing at the maybe-someday Smithsonian Museum of Computer History should have a Gamba room and a Trag room. ; )

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The only thing I can add, is the XCEED I found had some QC markings on the chips.  The Micron GAM 0398 AIS has a sticker that says "grayscale OK", and the Bt473KPJ80 has the resolutions written on it.

 

Micron GAM 0398 appears to be a Micron part number, but not any kind manufacturer reference. This is some sort of programmable logic, do we know the make/model of it? Also, this is the soldered chip in the top right corner(?), do we know what the socketed chip closer to the DIN connector is? I assume that's some sort of ROM or glue logic, correct? Are any of these dumpable? (My degree says EE, but my experience says spreadsheet monkey)

 

Edit: On these older PLA chips, the programming was burned in wasn't it? Finding this same chip today, even if we had a ROM dump, might not necessarily do us any good? Again, out of my depth here.

Edited by danpoarch

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Trag - saw you in there, wasn't trying to call you out. If anything, that thread is a little hard to read so I couldn't tell who knew what.

No worries, Dan. I didn't feel persecuted or even pointed at.

 

I too had trouble sorting out that thread's presentation. Probably doesn't help that I read it on a tablet. The formatting was a mess.

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Thanks trag - don't suppose there is any chance of some scans of the remaining material?

 

The glass fell out of my SCSI scanner years ago and I've never replaced it.   I'll keep it in mind as a to do, but honestly, the other stuff just isn't that helpful.  Maybe if one is doing repairs on an existing Xceed card, but even then, we've seen several variations on the card with different amounts and arrangements of VRAM, so the schematics on these sheets only apply to one particular model.

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Not sure if anyone is still following this thread.

 

The pages here seem to match up to some of the pages visible in that eBay listing, as well as the Micron Xceed ROM.sit file containing a folder called Rob is Barts Friend, looks interesting but I haven't had a chance to actually look through the files.

 

https://archive.org/details/MicronXCeedTechDocs/mode/2up

 

Hope this is useful to someone, looks like it was uploaded almost a year ago (April 30, 2019).

 

Edited by just.in.time
Correct link to go to page 1 of document.

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