Hi All, I have some time this holiday weekend to revisit some of my vintage Mac projects. Since I posted this I have acquired a IIsi ROM and I am still getting the same error sho…

Excellent site; I'll go through my Mac archives and submit any other obscure drivers I have.

Thanks for that, noidentity. Might I suggest also offering them to the Mac Driver Museum?

Just updating the links again: CustomGraphicsDriver.sit Custom_TwinTurbo9600_Driver.sit

I purchased a tower model from the original owner back in 2002. It was a pretty tricked out original configuration, likely in the $5000 range! -G3 300Mhz ZIF with 1MB cache -Rev …

I've got a DT sitting in the shed which I have to get round to playing with.... I'm unsure of the specs as I only paid cursory attention to it when i got it. It was just a machine …

Bringing back an old thread, I scored the best upgrade for my G3 yet: a real Woz autography on a blank bezel!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! [] ]'> He was in town and did a…

But then if i do this…. I will end up talking my self out of wanting a Quadra 840av. I want one ! Click to expand... Yeah,but then you'll have to see how over clocked you can …

I'd love a copy of your diagram if you still have it!

Some LC475 run stable at 40MHz just as they are. Why not try it before you get a large 840av? And when it works, treat yourself by getting a new 840av. ;D

from the link above: I changed MC88920 to MC88916DW80, and my LC475 is working at 42Mhz perfectly. Higher clock causes unuseable serial ports (Ummm---regrettable). Click …

There's another simpler way to get to 40 MHz which used to be available from here:http://gabezing.sytes.net/LC475-40Mhz-E.html However, that site's been unavailable for a while an…

I have SUM II on floppies. If anyone wants it, I can image it and upload it somwehere

My SE/30 SCSi problem has been fixed!! The via connecting pin 25 of the SCSI chip to pin 9 of the SWIM chip was corroded by leaked capacitor fluids and was no longer conducting. …

TERMPWR checks out good (+5V) on both the internal and external SCSI connectors. I actually checked it at each of the inductors first and finally at the connectors themselves. I …

if you have no TERMPOWER, that means your fuse or inductor feeding the SCSI bus and/or IC is open circuit. Testing and replacement will bring the bus alive.

Z53C80 and NCR53C80 are the same part from different manufacturers. Often, one manufacturer will license the part from another. In some cases, they develop the part independently…

techknight, If i did my research correctly, I should have seen +5V across pins 24 and 25 of the external DB25 connector if the SCSI bus were working correctly. Unfortunately, I me…

techknight, thanks for weighing in. Your videos were very helpful in getting me rolling, but I'm afraid I'm lacking background information to act on your current suggestion. What…

check to make sure you have termpower at the DB25 connector as well. if not, theres the issue.

ixnay on the ematicschay request. I just realized that zuiko21 gave me the logic board connections for the 53C80 in the link in his response. I thought it was a pix of his board …

Cool. The symptoms were very similar to my problem, but on your board, the software at least detected that something was out there. On mine, SCSIProbe just blinks "SCSI Bus Not T…

That was my board in the video. It would boot up to the question mark, but wouldn't recognize any SCSI devices whatsoever. He fixed the bad connection and it works great now.

Gents, thanks for the quick update. Just got done watching about 4 of TheTechKnight's Youtube videos on resolving SE/30 problems to see if I could learn more. He also had a SCSi …

The link to the 53C80 datasheet has changed from to http://www.prismnet.com/~trag/DataSheet/Z53C80.pdf Basically, anywhere I ever used io.com, it is now prismnet.com. I wish I …