
rplacd
68kMLA Supporter-
Content Count
296 -
Joined
-
Last visited
About rplacd

Recent Profile Visitors
The recent visitors block is disabled and is not being shown to other users.
-
I have PowerBook 180 with a 10MB memory expansion – I don't know off the top of the head whether they're compatible. However, if you're interested, I'd be happy to sell one to ya... as long as you take the bottom half of my PB180 along with it! I'm too afraid to disassemble it again to see what I'll break, and the damn thing is a white elephant at this point.
-
Honestly, why the hell not. I think I'd learn a lot from this project about how the Toolkit works. Macintosh Common Lisp is fantastic – it's a good way quickly working and prototyping with the Toolbox. Here's an article from MacTech. However, anyone you create on it probably won't run on a Mac with less than multiple MBs of RAM. Also, as a fun aside: as a joke, I tried to do a similar IMGUI prototyping environment, but with JavaScript (I used Duktape for a modern JavaScript environment.) It took 45 seconds to initialize the VM on System 7 on a Macintosh Classic.
-
Incidentally, I wonder if your PCB layouts would still show which pads on an original SE/30 board are connected to each other. I imagine it'd be useful for repairs/bodge writing/troubleshooting.
-
I'd choose the Classic II as a good starter Mac. Actually, I have a really soft spot for them. I'm inclined to think that the Classic II AB will be more robust: it's a lot less dense, there is no longer a separate PSU; Apple also moved the fan to a different location in the case for better cooling. A couple of other reasons, some that may or may not be relevant to you: – the Classic II's construction is a lot simpler than the SE, and so disassembling one to get to the logic board is a lot more straightforward compared to the SE; – doing simple mods like replacing aging fa
-
Out of curiosity, what's the socketed accelerator you've cloned there? Not the PDS one sitting on your desk – although I'm now pretty curious about that too
-
Oh, stupid me, you're right. That's what I get for posting late at night. Least I can do is actually look it up. I'll be lazy and give a ballpark figure – I think 9 power pins (including fan voltage supply), plus an FPU select pin. So we can get away, conservatively, with 86. Ack, I'll look over this more properly in the morning!
-
Ah, drat! Welp, I guess I'll stay up for another hour searching the internet... 96 pins for the '020 PDS interface – I looked it up in Designing Cards and Drivers for the Macintosh Family, v3.
-
Did a little internet shopping for off-the-shelf dev boards that might work, just for fun. If you want to do a lot of work for a relatively low price, Lattice has the iCE40-HX8k breakout board that exposes 4 * 40 = 160 IO pins. So 120 for PDS, which leaves barely enough for memory, 40 pins for DRAM or whatever (not including power supply pins.) Solder in 40-pin headers, stack a daughterboard on top, who knows. But what can you do in 7680 logic blocks? If you have a Terasic dev board with an HSMC connector (which cost multiple $100s, are only on their higher-end dev boards