Monster 6502

Eric had it at the Maker Faire. He'd covered it with a antistatic plexiglass but it still had some static sensitivity. He was exercising it with ( I think ) a R Pi. He'd been depending on the gate capacitance only. I told him that to get it a little more reliable, he would need to increase the capacitance a little for the floating nets. It will cost a little on power but there isn't that high a toggle on all of the nets that are dynamic. 10 to 20 pf should make it more stable. He needed a separate body attachment for the transmission gates. Al he could find were multi transistor packs. Most all of the important buss and status locations have LEDs on them. The layout is close as practical to the original silicon. Dwight ________________________________________ From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Eric Smith <spacewar at gmail.com> Sent: Saturday, May 28, 2016 10:31:39 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Monster 6502 On Sat, May 28, 2016 at 5:31 AM, Corey Cohen <applecorey at optonline.net> wrote: 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. 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.