Recent content by trag

You are a PLD deity, Bolle.

I'm looking at the caches on Fizzbinn's excellent guide: https://tinkerdifferent.com/resources/ppc-macintosh-l2-cache-modules.19/ Specifically in the last category for PowerSurge and Catalyst machines: D - 7200/7300/7500/7600/8500/8600 160 pin Cache DIMM Pin groupings: 25 - 35 - 20...

Just saw this on Ebay: https://www.ebay.com/itm/306945112145 And notice that the main chipset is the same as the valuable Nubus cards. Looks like there are three or four PLDs that are different, and of course, the entire circuit board. Still, if someone is bored and wants to make a Thunder...

I had an Adaptec 3940U I converted way back when. Desolder/solder the PLCC32 EEPROM. Didn't work, until some nice fellow recommended I clean up residual flux. Then it did. It's a longshot, but might do the trick.

Yes it should. Did you clean up after soldering the resistors? Even if there's no solder bridges, residual solder flux can cause issues. So a flux remover or just an isopropyl scrub is good practice. Other that I'm out of ideas and eagerly awaiting when you have that eureka moment, so...

You might try shopping on this page: https://dalbani.com/product-category/tv-components-and-peripherals/flyback-transformers-tv-components-and-peripherals/ Way back in the before times, they had the flybacks for the 9" B&W for about $5 each, until they realized there was a market for them...

I don't have an answer to your question but am also interested in the solution/trouble shooting. I will contribute that you should check the Revision of the card. The revision is typically silk screened on the circuit board pretty much dead center. Sometimes it's covered by a sticker. The...

DId it boot once and load drivers? Sometimes, if the Mac is not shut down, but restarted, the drivers will stay in memory. There used to be a long explanation about this phenomenon with respect to CDROM drivers. Boot once, get your HD CDTK loaded, and after that the CD ROM drive was...

I have not done the testing in practice. In theory, it depends on the card. While one would expect it to just give one more capacity and therefore more colors and screen size/resolution, there is a way it could improve performance. If the added memory actually widens the data bus (goes...

Never mind. CE# of the chips is tied to pin 115 on the DIMM. Grackle (MPC106) has two RCS signals, RCS0 and RCS1 and the former goes to pin 115 and the latter to pin 35, but pin 35 is not connected to anything on the DIMM except that blank resistor.

Anyone know what this signal does? It's connected to pin 35. It's shown on this schematic (page 6) https://www.macdat.net/files/pdf/apple/schematics/apple/powermac_g3_gossamer.pdf On actual ROM DIMMs, on most of them it's not connected to anything. On the 820-0961A module it goes to a...

Getting ready to fabricate ANS ROMs as requested. I have PM'd the four people who have made requests to finalize. If anyone else wants one, now's the time. Depending on final answers, it looks like there are requests for between six and nine modules so far. I'd like to get soldering done...

That is very cool. I wouldn't have any trouble reproducing the hardware, but at a casual glance I can't figure out what to do with the various software listings. How to compile? Where to load? I'm not in any danger of trying to make one any time soon. My bench is backed up indefinitely...

Very nice. Thank you. Looked for that off and on for the last ~30 years... I know I've browsed bitsavers before. Either it was added later, or I just overlooked it. And it led to another white whale. The datasheet for the 85C80 (combo 53C80 and 85C30) found in some powerBooks. It is...

Apple used the AM79C950 on the ANS and PCI PowerMacs (and AV Quadras). It was code named CURIO. Is your datasheet for the AM79C950, or are they using a sheet for the 940 because it's related to the 950? AMD had a family of "composite" chips that combined ethernet and SCSI or ethernet and...