Ethan Dicks wrote: Or so I've been told. You wouldn't be saying that if you'd seen the PCB though. The one I had manufactured looked really slick, the homebrew one is covered in wire patches. Note the schematic says "Rev C" - my PCB is a Rev A, with Roadrunner-wire patches to bring it up to Rev C. I did think of that - there's a Slave I/O port. You have one unit set as a master, and any number set as slaves with their own unique addresses. The master takes commands over RS232 and feeds any commands for other units over the SIO bus. But I never wrote the code for that... It could be done fairly easily, just I haven't done it. Mainly because I only have one unit, so debugging would be a pain. Good point, but I've only ever done 8-bit work. That might change once I get around to building a Coldfire-based SBC (I've got the chips, I just need the design time), but not at the moment. Porting it is on my to-do list. I'm sorely tempted to rewrite it from scratch, adding Intel HEX read support and Windows/Linux multiplatform compatibility. That's a job for later, though. An optional wxWidgets-based status window/file picker interface might be a neat toy too, but that's an 'if everything else is done' project. In fact, I need to drag all the design docs for the EPROM emulator onto my website at some point... It's a shame I lost all the mechanical diagrams I did in AutoSketch - that was the kick that started me backing things up onto the NAS. Losing a 40GB backup file to a dodgy backup tool (and equally dodgy supplier that attempted to sell me a 'recovery' tool to fix said backup file) was an additional, painful kick that made me start using ZIP and TAR files again... They do make a lot of things easier. I couldn't imagine how much trouble it would be to have written my 6502-MBC's boot block code without the emulator. The logic analyser helped too - especially when I finished off the inverse assembler module and symbol-to-address-label converter. HP 1650 series analysers rock. A bigger symbol table would be nice though - IIRC the limit is a few hundred, but I've got all the BIOS hooks and callbacks in there at least. It's easier to figure out what's going on when you get "JSR PUTCHR" on the display instead of "JSR &FDF0"... -- Phil. | (\_/) This is Bunny. Copy and paste Bunny classiccmp at philpem.me.uk | (='.'=) into your signature to help him gain http://www.philpem.me.uk/ | (")_(") world domination.

On Aug 28, 2007, at 10:21 PM, Ethan Dicks wrote: Ahh, no I hadn't. I pulled down the manuals; my unit looks to be a good bit older than that (though still similar). Upon digging it out and looking it over, it seems to be reasonably well-labeled, with a big DIP switch to select emulated EPROM size, and some jumpers for other stuff. The serial port is an RJ12 modular connector. Ahh, the manual for the unit I have is on bitsavers! I think I can make up the required cables with relative ease. -Dave -- Dave McGuire Port Charlotte, FL Farewell Ophelia, 9/22/1991 - 7/25/2007

On 28 Aug 2007 at 22:10, Dave Dunfield wrote: ...or for a 2764, you could probably do the same with an FM1808 FRAM substituted for a 2764 (write 4 copies of the data) or 27128 (write 2 copies of the data). P/ maps to WE/ on the FRAM. Pin 1 (Vpp) either high or low (but not at the programming voltage) is a don't care, as long as it's at 0 or 5v. Or so it appears to me. Cheers, Chuck