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2017-02-12 21:53

willymanilly

Registered: Jan 2016
Posts: 27

C128 Clock Stretching

I've just started working on a c128 emulator and my first goal is to get the VIC version of Risen from Oblivion (Risen from Oblivion) working. I've been making good progress including getting the final frog screen showing graphics in the upper/lower border but I've hit a roadblock with a couple of the effects because I'm finding it challenging to get my hands on any detailed information on how clock stretching actually works for the c128. The best I have been able to find is the obvious information that PLA, processor, and VIC chip are involved with syncing the 2MHz clock with the 1MHz I/O chips. I've been hammering away for the last few days but just can't get the timing right. If anyone can point me in the right direction with more detailed information than what the C128 programmers reference guide and mapping the c128 offer, it will be much appreciated. :)

You can download my emulator here to see the progress I have made. ==> http://www.z64k.com

2017-02-13 06:09

chatGPZ

Registered: Dec 2001
Posts: 11089

i'd ask on the cbmhackers mailinglist - which bil herd is reading

2017-03-06 22:32

willymanilly

Registered: Jan 2016
Posts: 27

Quoting Groepaz