Date: 2003-08-20 06:16:50
Hi All, I'll answer a few issues in the one reply... >> Try for a simple and compatible design. I mean, you're talking about >> replacing the DRAM's with faster SRAM's. MagerValp just pointed out that >> you'd have to physically replace the PLA with a new one that will redirect >Actually making a cartridge is harder because the cartridge port has not all >neccesary control lines to simply integrate a faster CPU into the system. >Thats why the SuperCPU uses complex caching techniques for itīs on board ram >access. I have currently no possibilities to design such a complex device. And I think the cartridge (or even CPU socket) route offers the potential for a three chip solution, providing you can "give up" on some of the complex things like caching etc... when you start talking about replacing DRAMs etc the project gets exponentially more complicated, and also compounds in that you will be dealling with at least three major C64 board revisions. For example, to replace the DRAMs, you'll need buffers, latches etc ==>> at least one 44pin CPLD + SRAM. To replace the CPU ==> at least one more 44pin CPLD + CPU, to upgrade the PLA... and so on. In TTL it will even be more complex... wire-wrapping three 28-44chips may *just* be bareable for a hacker... wirewrapping a something like the 64er project is out of the question! > I did like Nicholas Coplin's c64 accellerator ideas; He talked about using > a Pentium-class computer running a 6502 (65816?) clone via software based Agree, turning on a second PC would be a *pain* especially given how slow their boot process is.... but I'm thinking with a CPLD I could improve the through-put problems... stay turned ;) But a mini-SCPU would truely be better! - Nick - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Your Engineering Solutions Provider http://www.orbeng.com.au/orbital/engineeringServices/engServices.htm - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - PLEASE TAKE NOTE: The contents of this email (including any attachments) may be privileged and confidential. Any unauthorised use of the contents is expressly prohibited. If you have received this email in error, please advise us immediately (you can contact us by telephone on +61 8 9441 2311 by reverse charge) and then permanently delete this email together with any attachments. We appreciate your co-operation. Whilst Orbital endeavours to take reasonable care to ensure that this email and any attachments are free from viruses or other defects, Orbital does not represent or warrant that such is explicitly the case (C) 2003: Orbital Engine Company (Australia) PTY LTD and its affiliates Message was sent through the cbm-hackers mailing list
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