RE: Building my monster C64 accelerator

From: Oliver Achten (
Date: 2003-08-20 11:41:45

> But, please tell us what idea you had in mind? I tried thinking of several
> altenatives but all had at least one disadvantage: the needed I/O was
> visible for all the virtual C64.

Hmm, my idea was circling around something like an Amiga like memory
configuration, which cold look like....

$000000 - $0fffff : 1MB Ram with standard memory mapping (C64 i/o space),
i.e. 16 virtual C64s
                            Memory is slow ram due to extra cycles needed by
the VIC.
$100000 - $ffffff : 15MB area which is completely free to use. Memory runs
with full speed, since
                           it is unaccessible to the VIC. Could be called
fast ram... ;-) 

You could stuff all extra gimmicks in the $100000 - $ffffff area not
conflicting with the existing c64 memory scheme. And you could make full use of the
whole dot clock, running the CPU at 7,84Mhz.

How about that?

COMPUTERBILD 15/03: Premium-e-mail-Dienste im Test
1. GMX TopMail - Platz 1 und Testsieger!
2. GMX ProMail - Platz 2 und Preis-Qualitätssieger!
3. Arcor - 4. - 5. T-Online - 6. - 7. daybyday - 8. e-Post

       Message was sent through the cbm-hackers mailing list

Archive generated by hypermail pre-2.1.8.