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Look at the four ROM chips on the back. They're 44 pin chips about 1.1" X .5". The original 8600 will have chips labeled 343S0280 - 343S0283. (343 might be 341.) The Enhanced 8600 has chips labeled 343S0380 - 343S0383. Also, I believe the Enhanced lacks a cache slot. There should just be...

There was a topic similar to this recently either here of on 68Kmla. Turned out the resistance between power and Ground was normal for that board. You must account for leakage in all the chips that connect between 3.3V and Gnd. 3.3V/28ohm = 100 mA, which does not sound out of line. What...

When you have successfully identified it would you please post a report in this thread: https://tinkerdifferent.com/threads/macintosh-connector-part-numbers.135/

If this interests you, you might try to track down the author of Asterax. I guesss it's a later game, so maybe not interesting in the original 68000 sense, but it's fun and runs really well.

There is some evidence to support this hypothesis. Sun Remarketing was the company selling Lisa hardware forever and other Mac stuff. When they decided to close up they sold lots of 10 and 50 Mac Plus mice on Ebay. I picked up one or two of those. Sold them all for under $10 each. Sigh...

I believe that the 9S08 series is backward code compatible with the 68HC05. The pinout won't match, so an interposer board would be necessary, but it ought to be fairly straight forward to move the Egret/CUDA code to a new 9S08 from NXP. In theory...

I used to do this to my '78 KZ1000LTD. If I forgot my keys, or locked them under the seat, pull off the left side cover, bend a paper clip strategically, insert it in the correct 2 holes on the connectors, and ready to run motorcycle... Amazing that any of those were not stolen...

I vastly prefer the written version. Videos are a frighteningly inefficient way to consume information in most cases. That said, what a great summary. This is a terrific narrative. Concise, but with all the important points covered. Also, thank you again for running the group buy.

Mine is packed away in a box in the attic somewhere. It needs to come down for cap replacement, but I'm not going in the attic until Summer is well over with (central Texas).

Me too times ten. I drive a 2010 Buick. It might not be what I would have chosen myself, but it was a hand-me-down from my parents, and I'm certainly not going to spend money on a car when I get one free. But when I look at the interfaces on the new cars -- What were they thinking!!!?!? I...

I wouldn't say that there is "no doubt". It's always possible that HP made more than one line/revision of PA RISC systems using different pinouts in the 72 pin sockets. That seems unlikely, but back in the day of mini-computers a lot of unlikely things happened...

Beautiful work. There was a thread somewhere in which a fellow basically rebuilt a hole in a board, or a fairly deep gouge, with a UV hardening solder mask. That might have some application in this type of situation. https://www.amazon.com/dp/B01MUB4PJL/?coliid=I1KVVVH33K1WIW I thought I had...

On the bright side, these solvents only cause cancer in California. Other locales, you're safe....

I totally agree with this, except, I might like XP better than 7. It's a tough call. What is this move to do away with clearly labeled menu items and replace everything with squiggles? And how the F(*(& am I supposed to just magically know what the squiggles mean? Yep. And I use Windows...

That does not sound out of line for transistor leakage in such a system. 5V / 16 ohms = ~1/3 amp. I suspect the ones that show 16 ohms are bypass caps which sit directly across GND and the 5V rail and the others are used in a different type of circuit somehow, such as audio. I don't have...

In my experience, the PA-RISC work stations used standard 72 pin SIMMs. At least the ones I worked with did. HP made a pretty penny claiming you needed their special memory in their PA workstations and in their printers of the time.... I once ordered a PaintJet XL300 (IIRC) and it would not...

Fishing weights are cheap and convenient and come in a dizzying assortment of sizes and shapes. However, not good for an environment where toxicity is a concern -- or did they stop making them out if lead? If you have a lot of time, browsing the metals category on Ebay can be useful. I've...

I should have stated it explicitly. I was suggesting electroplating as a method to thicken the connector region of the ROM SIMMs. Make the pins thicker. I don't know if electroplating is a practical way to add enough material to make the required difference.... If I ever find the top of...

Apple used to have a set of User (Human?) Interface Guidlines which they adhered to pretty strictly. The UIGs were based on actual testing and research of what was easiest for folks to learn and use. Or at least the folks they tested it on. I think around the beginning of OSX the UIG's went...

When you program in assembly, you control what your getting. If you're using a higher level language, you're just making suggestions.