68kMLA Classic Interface
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| Anyone know what this NuBUS card might be? | |
Posted by: mg.man on 2023-02-24 01:46:4316bit is a hardware change, not just ROM.If so... does that mean my GC can't do 16bit color? = the 0266 ROM will be no good to me? 🤔 | |
Posted by: mg.man on 2023-02-24 01:48:40341-0812 is not mentioned explicitlyHmm... 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?). | |
Posted by: Phipli on 2023-02-24 01:49:58If so... does that mean my GC can't do 16bit color? = the 0266 ROM will be no good to me? 🤔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. 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? | |
| Posted by: Phipli on 2023-02-24 01:52:06 | |
Posted by: mg.man on 2023-02-24 01:54:10Do you have an A or B board?Dunno... how do I tell? I see the article you posted mentions "a new CLUT/DAC chip" - but no detail? 🤔 | |
Posted by: Phipli on 2023-02-24 01:59:23Dunno... how do I tell? I see the article you posted mentions "a new CLUT/DAC chip" - but no detail? 🤔Same - the stuff I can find unhelpfully has something like the apple catalogue part numbers... not the silkscreened numbers. Your card is 1990 is the best I can do. When did they roll out the B? 😆 | |
| Posted by: Phipli on 2023-02-24 02:01:57 This is the same card date, but a newer ROM : 
Apple Macintosh Display Card 8-24 GC - Higher Intellect Vintage WikiNuBus based video card from Apple Computer.
wiki.preterhuman.net
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| Posted by: Phipli on 2023-02-24 02:05:29 @MrFahrenheit what ROM does your board have and what silkscreen dates on the board? | |
Posted by: mg.man on 2023-02-24 02:09:06Snap... found that - which shows :  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? | |
Posted by: cheesestraws on 2023-02-24 02:24:55...which seems to have a 'higher' Apple P/N? 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. | |
Posted by: mg.man on 2023-02-24 02:27:54I don't think that it's safe to assume any ordering of Apple part numbers.🤷♂️ | |
Posted by: Phipli on 2023-02-24 02:32:11SO what DO I have? Rev. C?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. | |
Posted by: mg.man on 2023-02-24 02:33:21The copyright date on the Bt RAMDAC is earlier than the AMD oneGood spot... perhaps the "Serial Number" is a (more?) reliable indicator? preterhuman (higher):  mine (lower):  | |
Posted by: mg.man on 2023-02-24 02:34:44Do you have any vanilla 8•24s? The GC can bus master them and accelerates one or more of the plain framebuffer cards.I *think* so... need to check. | |
Posted by: Phipli on 2023-02-24 02:35:21Good spot... perhaps the "Serial Number" is a reliable indicator?Weird! They're the same week!? And both before the RAMDAC copyright for the AMD part?!? | |
Posted by: mg.man on 2023-02-24 02:36:34They're the same week!?You're assuming "Mac" format Serial, though? I was wondering if it might just be the linear number of the card produced? | |
Posted by: Phipli on 2023-02-24 02:37:40I *think* so... need to check.  That's an 8•24. The 4•8 also works. Looks the same, but with 4 VRAM chips and the two SIMM slots fitted. | |
Posted by: Phipli on 2023-02-24 02:39:11You're assuming "Mac" format Serial, though? I was wondering if it might just be the linear number of the card produced?Given it is an Apple product, I'm not sure that it wouldn't be. | |
Posted by: jeremywork on 2023-02-24 03:22:0516bit is a hardware change, not just ROM.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. Have you tried it with the first gen ATi Driver? Doesn't that apparently, completely weirdly, likely due to being based on Apple 8•24 GC example code, enable acceleration on the GC?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? 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?).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.) If so... does that mean my GC can't do 16bit color? = the 0266 ROM will be no good to me? 🤔The serial number of my card does start with CA2... Still, give it a go.  | |
| Posted by: cheesestraws on 2023-02-24 03:32:52 Does anyone know what Brooktree part that Bt RAMDAC really is, underneath its Apple disguise? | |
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