Recent content by CommodoreZ

How bad is it, beyond the structural/cosmetic damage we can see?

So, on the 8K core plane I've been using, I ran the 1200 Logic Test for like 80 minutes non-stop, and it ran without issue for the duration of the test. Then I switched over to the Memory Checkerboard III test, which also ran without issue for over an hour, no faults detected or reported. I...

I fixed it? I honestly don't know what happened. I replaced U42. And the tests kept failing. So I had my hand-entered diagnostic routines tested with a second set of eyes. Turns out I had some bits wrong... human error. :oops: I still don't know what initially caused the fault that sent...

Windows 95 OSR2 sounds like a great choice. As for software, 95 Plus!, Photoshop 4, MS Office 97, Command & Conquer, Red Alert, the Microsoft Best of Entertainment Pack, LEGO Island, Atomic Bomberman, Lode Runner Online: Mad Monk's Revenge, Rollercoaster Tycoon, Warcraft I and II, MS Flight...

Okay, we may have found the point of failure, and it's upstream of the part being explored per post #101. This N8271 shift register is used to store a bunch of states as we progress through processing. The signal we care about is how IO*E is generated from IO(F+D). Presumably, that data is...

Right, so look at the examples above: most of them don't bother to do that. The OSI-300 doesn't even care, it wants you to start from scratch each time with a reset CPU, and it accomplishes its goal. In order to single step an NMOS 6502, you keep the clock running, and instead control single...

I think that one is a modern machine. Awesome work, but again this modern machine made in the past few years. The thing that killed the front panel was the birth of the Appliance Computer, caused by a combination of circumstances of which came to a head in 1977. I've explored this aspect in...

From novasareforever.org: 096-000150-01__Nova_1200_Logic_Test_095-000036-01__1970-1974.pdf which is the manual for 095-000036-01__Nova_1200_Logic_Test__1970-1974.ab

It wasn't U11. As far as I can tell, the "P" pulse refers to a special pulse used for interacting with I/O devices. When a No I/O Transfer instruction is sent, which device it applies to depends on the last 6 bits of the instruction. Device code 0 refers to the CPU, and is sort of a dummy...

In the same vein as the Altair 8800 or Nova 1200 or other minis/micros have front panels, which historic (about 40 years or older) 6502-based machines contain front panels of that type? I'm not talking about the type of keypad designs seen on the KIM-1, or SYM-1, or the more advanced designs...

Did y'all not have fake 3½" floppy blanking plates in your 90's desktops? I see this as no different. If you want a real drive, remove the plate and install a real drive. What's the big deal?

I'm looking forward to this case. I've got the older GD09B that the FLP01 was based on, and it was far too cramped for my taste. This new tower has my attention, especially since it has multiple 5¼" bays which I can and will use.

Zeta, 08th MS Team, 0080, and Gundam Build Fighters are all favorites of mine. It's been awhile since I was in the mood for Gundam, but when I am, those first three are what I jump toward. I used to build gunpla, but it's been a few years since I had space to do proper airbrush work. I'm a...

The Nova 1200 made it less than week before it broke again. 😣 The good news is that serial echo routines and ASCII loop routines work okay. However, something failed so badly that I can't even get the bootstrap program to correctly pull in a the binary loader to bring in the full Nova 1200...

Yes, both ROMs were installed, just like I found it. Well, without the bent pins. Just to confirm, if I were to burn a ROM for U1101 and only use install one ROM chip, this is the file you were referring to, yes?