----- Original Message ----- From: "Baltissen, GJPAA (Ruud)" <firstname.lastname@example.org> To: <email@example.com> Sent: Wednesday, April 25, 2012 1:56 AM Subject: RE: 6545 40/80 col register values > For those not familiar with the CBM hardware: > - an 80-cols machine has 2 KB of RAM instead of 1 KB for the 40-cols one, > not a real problem > - this RAM is wired in a different way for each machine. And that is a > problem! > I used to have a board equiped with some added 74157 2-to-1 demultiplexers > replacing those wires plus a small board with extra ROMs. By flipping a > switch one could have either 40-cols or 80-cols mode after a reset. --------------------- As a matter of fact Steve and I were just discussing that a few days ago; as you say, the hardware to switch RAM & ROM etc. is pretty straightforward, but we were speculating if it were feasible to switch modes (preferably in software with a poke or printing a CHR$(x) ) *without* resetting the computer... Opinions? Message was sent through the cbm-hackers mailing listReceived on 2012-04-25 07:00:21
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