From: Nicolas Welte; address is valid for replies (Re:) only! (welte_spam_at_freenet.de)
Date: 2002-09-01 00:32:21
Hallo Ruud, > > Rossmöller 8MHz Z80 accellerator module for the C128, some news about this: Of course it's GAL chip is read protected, so it can't be cloned the easy way. I also made my first own GAL for the PETRAM expansion. Everything works nicely so far, now my 2001 has 32kB of RAM and 64kB of ROM :-) I put some pictures onto my projects page. > The moment the z80 initializes a transfer, a circuit puts the Z80 in > waitstate and waits for the positive edge of PHI2. The negative edge > releases the Z80 again. The 573 makes sure that the read data is still > available for the Z80. Hmm. I think the C128 already latches the data from the Z80 anyway, and the waitstate idea is exactly what is used on the Rossmöller board. I saw that it connects to the waitstate input on the Z80. I really must draw a schematic of the little board. Nicolas Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.4.