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Old 18th May 2021, 11:00 am   #92
ortek_service
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Join Date: May 2018
Location: Northampton, Northamptonshire, UK.
Posts: 1,394
Default Re: Early EPROM programmer.

I'd expect the 74S287 Character Generator PROM to be the same as that for the same one on the Softy-1 - as the video circuitry doesn't really appear to have been changed much from that.
In fact, from looking at pictures of the Softy-2 in the past, and now most of the circuitry that can be seen, it does seem to be mostly the same as the Softy-1 - just with twice as much RAM and the power supply circuitry changed for (simplier) single-rail supplies.
And the firmware may also not be that much different, just needing to handle the larger memory / slight-changes to connections of the larger EPROM's.

But getting copies of all that would still be good, given the rarity of this for the S2 so far. Although reading the PROM may be more tricky, without a PROM programmer etc. that supports it / using an Arduino etc. to write some software to readout contents.
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