the liber809 is built specially for the atari 800xl (and some other similar) the 6502 used on atari is not the standard one 3 pins are differents RW is not on pin 34 but on pin 36 (on sally 34 is NC) there is a HALT signal on pin 35 (nc on a 6502) the clock used on the atari is 1.75Mhz (not 1mhz) to produce Q the liber809 is using a digital delay line calculated for a 1.75Mhz so if your clock is 1Mhz Q arrives too late in the past I had a project to put a 6809 on a 6502 socket or a 6512 on a 6809 socket :) but never had time I'm trying to check on how I could make that type of adaptors but compatible with several clocks On 19/10/2017 21:53, Mia Magnusson wrote: > Den Thu, 19 Oct 2017 09:26:40 +0200 skrev didier derny > <didier@aida.org>: >> in fact by the way it is build liber809 is also bound to the >> frequency used on the atari 1.75Mz (use of DS1100L-175) >> >> so even with pin 34..36 corrected it can't work with a clock a 1 or 2 >> Mhz > Why wouldn't a 6809 good for 1,75MHz run with liber809-ish > hardware even at 1MHz? The timing won't be symmetrical but each phase > would be within the timing specs for a 2MHz 6809. > > But there is no reason to try to copy the liber809 if it doesn't work > out of the box anyway. > Message was sent through the cbm-hackers mailing listReceived on 2017-10-19 21:04:07
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