a500 Flashkick

[Doobrey]

Amiganew wrote:

Did anybody use Kickflash? What is /ROMEN, or what signal it must have.

I haven't built one for my A500 yet..been meaning too, but other stuff gets in the way  :-(

Anyway, IIRC /ROMEN is the the chip select signal that Gary generates when the address on the address bus matches one of the ranges of memory space reserved for ROMs, $f80000-$ffffff , $e00000-$e7ffff (and also $0-$7ffff when the /OVL signal is asserted to map ROM to low mem so the kickstart can boot the Amiga).
 Remember it's an active low signal, so if you're seeing more than 2-2.5v on your meter/probe it's not active.

[Doobrey]

Amiganew wrote:
That is really the original /OE Signal from Board

Doh, sorry I forgot the A500 is different to the A1200 ! In the A500 the /CS at the ROM is tied to ground so it's always active, and like you said /ROMEN goes to /OE, Whereas on the A1200 /ROMEN goes to /CS and /OE (at the ROM) is generated by OR'ing /ROMEN and Gayle's /OE  ...guess I'll have to play with my A500 a bit more :hammer:

BTW, for A500 schematics there's a link on Ian Stedman's website, but it doesn't mention what revision board they're for.

[Doobrey]

Amiganew wrote:
OK Now a small PCB.

Looks like it's gonna be a nice job, certainly better than my rats nest of wires and veroboard!! (which currently has a broken wire, but I can't see where it's broken from  :-x )

[Doobrey]

Amiganew wrote:
P.S. What is veroboard

It's a brand of prototyping stripboard. If you want a nasty shock here's some in action :-o  (well, I did say your pic was neater!)