Monster 6502

Corey Cohen applecorey at
Sat May 28 14:55:06 CDT 2016

> On May 28, 2016, at 1:31 PM, Eric Smith <spacewar at> wrote:
>> On Sat, May 28, 2016 at 5:31 AM, Corey Cohen <applecorey at> wrote:
>> I can't wait to buy one!!!  I have a spare Replica-1 just waiting to hook up to a Monster 6502.
> It doesn't run at full speed. It presently runs in the tens to low
> hundreds of kHz.  If a Replica-1 can be run slower than normal, that
> might work.  Other common 6502-based micros, such as the Apple II or
> Atari 400/800 will not work at low speed due to inherent timing
> requirements related to video generation and DRAM refresh.
>> Just need to wire up a single step switch and this thing will be awesome!!!
> If you wire single-stepping using the RDY line, that should work,
> though it will only single-step read cycles, not write cycles.
> You can't single-step the actual clock because it is dynamic logic.

The replica-1 uses a propellor chip for video and static ram so I don't think it's that critical to timing. 

More information about the cctalk mailing list