Recent content by cjs

Thanks for that. There are already a couple of scans of the manual up on archive.org, but this one is higher resolution.

Well, I would call those "computer" stores, not "electronics" stores. The latter makes me think of walls of drawers filled with resistors, caps, diodes, transistors, 7400 parts etc. But they're still around; there are dozens in Akihabara. I think maybe you just need to move to a better country...

That seems really weird. Can you perhaps just tell it it's a straight .BIN file, give it a starting offset of nnnn:0100h, and let it go at the code that way?

The small board in the third photo is a stand-alone SBC: it has a crystal resonator for the clock, an 1802 CPU, an NEC D446C 2Kx8 static RAM, the ROM, and the CDP1852 is a byte-wide I/O port. I'm not sure about the other small board. The MC14517 is a dual 64-bit shift register. There's no CPU...

Ooops, yes; you're absolutely correct. I left a (binary) zero off the end of my previous calculation somehow. @new_castle_j You should re-run that first read/write/read test against ports $260/$261/$260. (Though I suspect that, given your driver didn't work, this won't work. But either way, it...

Ah, your further explanation clears up a lot, thanks. Well, that's a good sign that the schematic isn't completely different, at least, and lets us know that the lowest address bit is selecting A0=read/write data and A1=write command ports. Another quick check you could do is confirm that pin...

Yes, the MZ-80A was part of the whole MZ-xxxx series of computers (which has a rather confusing numbering system), and these may well be coming up because they're Z80-based. It's their own architecture, and has no connection to S-100 whatsoever.

Well, this is the first we've heard in this thread about a driver, and also the first time we've seen this schematic of mysterious provenance. It's really a good idea, when you introduce something, to say where it came from and what you believe the connection is between that and the actual board...

Lol. That one has a '245 on it, too.

The latch, from its positioning and what I can see of the traces near it, looks as if it's likely latching data for the data pins of the CH375. Anyway, unless you can dump the 16V8, my only idea is to set the thing up on a test rig (or maybe just use a 'scope while it's on your computer) and...

Yes, Oregon Trail for the Apple II was copy-protected. I don't recall the details of the copy protection, but if you want a cracked version, it's available on archive.org. (That's a 5.25" version, however; it used both sides of the floppy.) Actually, it would be really nice to get a 3.5"...

Neither I nor (as far as I can tell) you have the source code or a disassembly of that two-year newer version of BASIC-80, so I don't see how either of us could have noticed how close or far it was. And I will answer honestly: yes. Yes. That's exactly what you'd expect, since all versions of...

Well, as a blanket statement, that is wrong. If your memory is slow enough that wait states are being inserted, merely removing the wait states will also require faster memory. (Given how slow that ROM is, this is what I had assumed that krebizfan was talking about, though tweaking other things...

Post #46 specifically and carefully says, "A number of efforts at speeding up the Model 100 line include replacing the ROM with a faster one." [Emphasis mine.] Which was what I was pointing out when I suggested that, "you probably do agree with krebizfan that speeding up the Model 100 could...

Fair enough, but why debunk fallacies that nobody has brought up?