Re: C64 ROMs on a MAX?
Date: 2001-02-09 01:46:59

On Thu, 8 Feb 2001, Ruud Baltissen wrote:

> > eg the Kernal hangs 'cause it can't find a second CIA to
> > intialize or something.
> If the Max has only one CIA, at what address does it show up? The C64 has
> two CIA's. Remove the "keyboard"-CIA, and you have no interrupt: cursor does
> not blink. Remove the "drive"-CIA and you have no normal screen as this CIA
> steers two lines of the VIC.

Ya know, this is quiet curious, because the max needs the CIA for the
keyboard because there's a keyboard ON it ;)  Makes me wonder.. hm.  I
wonder if the vicII isnt locked to the low 16k of ram, since there's only a
few k in there.

> Presume the CIA of the MAX is the "drive"-CIA and the rest of the hardware
> (addresses and wiring) is the same, you only have to "move" the interrupt by
> replacing the addresses of the used timer by the ones of the "drive"-CIA.

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