mg.man
Well-known member
If so... does that mean my GC can't do 16bit color? = the 0266 ROM will be no good to me?
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Anyone know what this NuBUS card might be?
- Thread starter mg.man
- Start date
mg.man
Well-known member
Hmm... in my limited experience, 'higher' part numbers usually = 'newer' things... You're saying my -0812 is 'older' than your -0266? Is yours an EPROM or Mask ROM? Mine appears to be the latter, though it could be a EEPROM I suppose (but back then?).
Phipli
Well-known member
I believe the RAMDAC changed on Rev B boards, if you have a Rev A board, even with a later ROM, it won't do 16bit. I'd have to look up part numbers, I'm half asleep and working from memory.If so... does that mean my GC can't do 16bit color? = the 0266 ROM will be no good to me?
Also, the internet is full of errors, so there is nothing quite like giving it a try
Do you have an A or B board?
Phipli
Well-known member
mg.man
Well-known member
Dunno... how do I tell? I see the article you posted mentions "a new CLUT/DAC chip" - but no detail?
Phipli
Well-known member
Same - the stuff I can find unhelpfully has something like the apple catalogue part numbers... not the silkscreened numbers.Dunno... how do I tell? I see the article you posted mentions "a new CLUT/DAC chip" - but no detail?
Your card is 1990 is the best I can do. When did they roll out the B?
Phipli
Well-known member
This is the same card date, but a newer ROM :
wiki.preterhuman.net
Apple Macintosh Display Card 8-24 GC - Higher Intellect Vintage Wiki
NuBus based video card from Apple Computer.
wiki.preterhuman.net
Phipli
Well-known member
@MrFahrenheit what ROM does your board have and what silkscreen dates on the board?
mg.man
Well-known member
Snap... found that - which shows :Apple Macintosh Display Card 8-24 GC - Higher Intellect Vintage Wiki
NuBus based video card from Apple Computer.
Mine has :
...which seems to have a 'higher' Apple P/N?
HOWEVER, this [https://support.apple.com/kb/TA48238?locale=en_US] lists the card with the -0266 ROM (which the preterhuman one appears to be) as a Rev. B? SO what DO I have? Rev. C?
cheesestraws
Well-known member
The copyright date on the Bt RAMDAC is earlier than the AMD one, though, which also backs up that the one mentioned on preterhuman is a rev B and yours is a Rev A. I don't think that it's safe to assume any ordering of Apple part numbers.
mg.man
Well-known member
Phipli
Well-known member
I think you have a Rev A, but not having 16bit isn't that much of a problem
Do you have any vanilla 8•24s? The GC can bus master them and accelerates one or more of the plain framebuffer cards.
mg.man
Well-known member
Good spot... perhaps the "Serial Number" is a (more?) reliable indicator?
preterhuman (higher):
mine (lower):
mg.man
Well-known member
I *think* so... need to check.
Phipli
Well-known member
Weird! They're the same week!? And both before the RAMDAC copyright for the AMD part?!?
mg.man
Well-known member
You're assuming "Mac" format Serial, though? I was wondering if it might just be the linear number of the card produced?
Phipli
Well-known member
That's an 8•24. The 4•8 also works. Looks the same, but with 4 VRAM chips and the two SIMM slots fitted.
Phipli
Well-known member
Given it is an Apple product, I'm not sure that it wouldn't be.
jeremywork
Well-known member
This is what I've thought as well from my research. My card came with 16-bit working via its original 341-0266 ROM and even after PRAM reset, all I could get with 832 x 624 sense pins was a black screen when 341-0812 was inserted into the same card. Not even mono or 8-bit.
I'm curious to know the state of @mg.man's card- is 16-bit selectable in 640 x 480, and is 832 x 624 a working resolution when using a monitor/adapter with the correct sense pins? Then it'd be good to see what changes with 341-0266. It may enable 16-bit color if previously missing, and it may or may not enable 832 x 624 depending on whether that was missing and the card is a Rev A or B or that information was even valid in the first place.
I did try to make this work a few times, but it seemed to always show an X when loading, and acceleration wasn't seemingly any different. The 7.0.1 CP works with the same caveats all the way from when it was seemingly broken by Macintosh Drag and Drop v1.1 around 7.1.1 > 7.1.2/P all the way through 8.1 on the 030 machines. I believe the incompatibility on Quadras was due to the busmastering pins being configured before Nubus 90 required the same pins for different functions (which all Nubus Quadras at least partially implement.) I haven't tried the ATI drivers there but I can attempt. Maybe x100 PowerMacs too?
I was under the same impression; and it confused me when I was missing Rev B features... Speculating based on the lack of 16-bit/832x624 support when installed and the ROM sticker itself is copyright 1989-1991 on my 341-0266, but curious to know what yours does out of the box.
The chip is an AM27C512 -200PC (the UV erasable variety.)
The serial number of my card does start with CA2... Still, give it a go.If so... does that mean my GC can't do 16bit color? = the 0266 ROM will be no good to me?
Last edited:
cheesestraws
Well-known member
Does anyone know what Brooktree part that Bt RAMDAC really is, underneath its Apple disguise?
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