I already had the hacking going before by socketing the DIPs, but now the REAL hacking can begin since it'll be WAY easier to change the ROMs without yanking out the hard drive and floppy drive, and it'll be way easier for everyone else to play around with the hacking too.
Speaking of others, I have 11 more boards here (with no jolly roger yet). Who all is interested in one? You'll still need an EEPROM burner to put programs on the chips until I can figure out how to make it fully programmable over USB or whatever -- or even a programmer board with a 64-pin SIMM socket would be great, but I can't find 64-pin SIMM sockets anywhere
(plus I'd have to bring out the write enable line somehow). Once I get the jolly roger stuff finished I'll do a bigger order from Seeed (50 boards perhaps?).
But until then, is anybody interested in boards? I'd be happy to send out bare boards to anyone for $2.90 (1/12 of my PCB order cost) plus the cost of shipping
Like I said, the SIMM should work in any of the II series Macs that have a ROM SIMM socket with the exception of the IIsi but that can be fixed by cutting a trace, and also the SE/30. That cost will go down once I order a bigger quantity. You can provide your own sockets, capacitors, EEPROMs, and soldering in that case.
For an assembled one, I'd be happy to solder sockets and capacitors onto the boards but I'll have to charge a small amount more than just the parts cost because my time is worth *something*
You'll still need an EEPROM burner to flash the chips though. The sockets and capacitors cost about $4 in total to put on the board, the board is about $3, and I think it's fair to charge about $8 for my time, so I'm looking at $15 plus shipping for an assembled SIMM. Any objections?
That doesn't count the EEPROMs which you can get yourself from Mouser or another distributor like that for about $2 a pop. You'll probably want a PLCC extractor tool too. Anyway, I will reserve a board for tt just in case because I know he was interested way back when...let me know for sure tt.
bigmessowires wrote:How did you figure out the chips were byte-reversed? Just staring at the schematics again while looking for explanations? That could have taken a long time to realize, but you found it quickly.
Well I knew it was either going to be 1-2-3-4 or 4-3-2-1, so I just tried both combinations after I fixed the short. I had already known about the interleaving going on when I was hacking with the DIPs, but I never paid attention to which data lines each chip was connected to. Then I wanted an explanation for why it was the way it was, so that's when I sat down and thought about it
olePigeon wrote:Will the revision have the pirate?
The 12 boards I have now do not have the pirate, but the next PCBs I order from Seeed will. I'll probably go for the red silkscreen again too
And those will also have the fix so they will work unmodified in the IIsi.