Re: Multi-ROM built, what now?

From: Michał Pleban <*lists_at_michau.name*> Date: Wed, 05 Jun 2013 23:09:37 +0200 Message-ID: <51AFA911.6050603@michau.name> · lists_at_michau.name

Hello!

Pete Rittwage wrote:

> Perhaps an internal EasyFlash then, for standardization's sake?  :)
> It would be nice to be able to reconfigure a flash device than burn
> EPROMs, but perhaps that was already the plan.

I am building exactly that right now, though I have very limited free
time at the moment...

It has a 39F040 chip and a custom circuitry programmed in a CPLD. It
allows selecting a bank for KERNAL and separately for BASIC/CHAR/extra
ROM at $D600-$D7EF. It allows to reprogram the Flash from C64 side.

It is working right now but requires access to the BASIC ROM for
reprogramming, thus making it incompatible with cartridges. I need to
make it use KERNAL address space for reprogramming, but this requires
coping with the 50ns spikes on the KERNAL select line I was describing.
Thus it needs changes to the PCB and CPLD.

Regards,
Michau.

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