Search results

There was a very thorough IWII repair/refurbish thread from techknight either hear or on 68Kmla a few years ago. Not needed by the OP here, but mentioning it in case someone needs it later.

A 1 MB PCB design should work, if you don't mind bodging wires from pin 5 (A10) of the memory chips to the appropriate pin on the SIMM. Or a 1 MB layout would be easy to modify.

By production ROM, do you mean shipping ROM for machines intended to run AIX? Mr. Macintosh needs a plain AIX ROM for his ANS. He lacks even that. Is 2.2b6 a MacOS ROM at all, then?

Yes, I listed my sources of some hard to find sockets in another thread, and they didn't have hundreds, but no one is likely to need more than one or two. And they're all gone now. On the other hand, parts places do sometimes dispose of stock, I suppose.

I hesitate to ask, because I've seen a few publicly posted sources cleaned out, but where in the world do you find the DW80s for about £1 each? When available I'm seeing prices near $10 - $15 each.

Thank you. I guess I'm just going to have to try it some day. I'll put it on the list of projects waiting for bench space.

So far I have a two requests for ROMs. I'm going to leave the request line open until 5/22/26 (Friday) and then fire up the soldering pencil. It looks like there are four different ANS/MacOS ROMs in the .zip file that joevt kindly created...

Has anyone tested whether the DW80 specifically is needed? Motorola also made 88916DW70 and 88916DW55, and while those are rated slower in the datasheet, sometimes in practice, they're all the same part, once they have the process tweaked. Asking, because I have a full (minus a handful) reel...

It helps when you get the reward of having them work. In my experience, reworking these boards more than once is usually pretty dicey. I don't understand it either, because on visual inspection, they look fine, but then they just don't work. I assembled almost 200 of these when I was making...

I equipped two different DIMMs with those back around 2008. I had zero luck getting them to work. That was the start of the PEx ROM project. James in Britain sent me a few sets of those sockets with the agreement that I would make him a PEx ROM DIMM, but I could never get the socketed...

Regarding making more ROMs: 1) Should I start a second thread to handle the logistics? 2) I suspect I should wait a little while so folks can digest @ClassicHasClass 's information. Some folks may want 2.0, others 1.1.20.1 or both and deciding may take a bit. 3) There will be no...

On any of the X100 family, I strongly recommend installing Connectix's Speed Doubler. Apple had not made the 68K interpreter caching at that point and Speed Doubler delivers a very substantial improvement in performance.

Well, pin 33 on all four chips is definitely tied to a thicker trace and via as is typically used for ground or power plane connections. Visual doesn't tell us which one it is tied to, but given that the 29F800 on 7100 DIMM works, it must be tied to Power. I wonder why? The ROM chips have a...

Pin 33 definitely appears to be tied to something in @mizerable 's photo. Must be power plane.

There were a number of signals listed in the ANS CPU pinout that weren't in the Apple CPU card, or the other way around or something like that. I had an engineer from NewerTech giving me a little help on the sly; I think he's safe if I mention that now... But in the end, IIRC, there were...

Those conversions really shouldn't work, unless the 7100 ROM DIMM is supplying 5V on pin 33 for each of the chips. Perhaps it is. Now I wish I hadn't put that 7100 ROM away. I don't want to dig it out again. At least I know where it is... These chips (AM29F800/HY29F800) can work in 8 bit...

Never mind. Almost made it to bed and then remembered that there's a thread somewhere where someone replaced the chips on a 7100 module to make an ANS ROM. Dug out an old 7100 ROM and checked pin 28 and it is NC. So, assuming that report was a good one, not having pin 28 connected should...

Found in my notes from about 20 years ago when I was pinning out various ROM modules by hand, that Pin 28 of the ANS ROM is tied to GND through a 10K resistor. I hope that isn't necessary for them to work because the modules I made don't do that... I think I see a way to add a bodge, if...

Let's let ClassicHasClass do his testing first, to determine whether I made any fundamental errors. I would hate to start assembling these for folks only to find that every single one has some fatal problem. I made four because that way, if they all fail, it's probably a procedure flaw. If...

Typically, the heat sink grease has turned to chalk with age and needs to be cleaned off and replaced. Machine is overheating causing random crashes. Probably runs longer from a cold start and then starts crashing more frequently after being on. When removing hte heat sink from the CPU be...