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ST BusSpeeder

Posted: Thu Dec 28, 2017 11:15 am
by Administrator
20 years ago I upgraded a 520ST from 8MHz to 16MHz bus speed i.e. CPU and RAM were clocked with 16MHz, a 100% increase in speed. That way I was able to use a RSVE RS232 speeder with 38400bps and use the ST as an answering/fax machine. The old PCB was single sided home-brew type i.e. ugly :D
This year I reworked the design for SMD part use and it's ready for testing:
As the ST's clock tree needs to be revised some tracks on the ST's mainboard need to be cut! You need a 16MHz CPU and you probably need to replace the RAM as this project needs 70ns DRAM. So if you haven't done it yet it's a good idea to upgrade to 4MB with a PS/2 SIMM for example.
This project is definitely NOT for hardware rookies. The original design was created by Stefan Nitschke.

Re: ST BusSpeeder

Posted: Fri Dec 29, 2017 10:15 am
by Administrator
First benchmarks available 8-)

Re: ST BusSpeeder

Posted: Fri Feb 02, 2018 7:59 pm
by crashman

I really envy you.

Good work!