RE: More CPLD explorations

From: Baltissen, GJPAA (Ruud) <>
Date: Tue, 25 Feb 2014 07:58:57 +0000
Message-ID: <>
Hallo Jim,

> But, if you had a switchable PLA, what new modes would be of interest? (are there any?)

More then enough :)

The xc9536 has at least 44 pins, so outputs aren't any problem.
- At this moment both the 6526s occupy 256 bytes. By limiting it to 16 bytes you free up some space for extra hardware, like extra 6526s.
- The same can be done for the VIC and SID. I used this trick quite often to have space for extra RAM and/or EEPROM. An extra 6526 can be used for paging.
- Replace the 4164s by 41256, use an extra 6526 for paging, including user defined common areas.
- Start up normally, load some programs in RAM, then switch  I/O to $E000, and you cam implement a CP/M-like OS. I know, weird, but doable :)

Met vriendelijke groet / with kind regards,
Ruud Baltissen

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