On 6/18/20 7:28 PM, silverdr_at_wfmh.org.pl wrote: > At some point in time CBM loaded their replacements for some common LS TTLs, like 7712 in place of 74LS08. Rumour has it that it was due to supply shortages and they had to do something quickly, which led to the birth of chips like 7712 - supposedly notorious for their reliability. Do we know anything more about those chips? Some datasheets? Never seen any, but the numbers suggest HMOS-I as the process used. There were also a few 87xx, meaning HMOS-II. Here's the list of all that I have seen so far and what they can be replaced with: 7707 7406 or 74LS06 7708 74LS257 7709 74LS258 7710 74LS138 7711 74LS139 7712 74LS08 7713 74LS04 7714 74LS02 7715 74LS373 65245 74LS245 (found in VIC-20) 8708 74LS257 8712 74LS08 8713 74LS04 As for reliability... They did work, but it seems they don't age well. But that's OK after more than 30 years. GerritReceived on 2020-06-18 20:03:14
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