Some PETs came with a HD46505R as original CRTC. On Thu, 16 Sep 2021, Francesco Messineo wrote: > Hi all, > I am servicing a few PETs, all are "universal board" types. > In one of them I've found an HD46505R CRTC, it was socketed on a previous > repair attempt, so I don't know all the history of this machine. > However, it didn't produce any sync until I swapped the CRTC for a R6545 > one. > I've quickly had a look at the Hitachi datasheet and it seems that the > difference lies > on the Status Register, present on the 6545 but missing from the MC6845 > compatible CRTCs like the Hitachi. Is that a good reason for the PET > failing to initialize the display controller? > Thanks in advance. > Frank IZ8DWF > wlevak_at_sdf.org SDF Public Access UNIX System - http://sdf.orgReceived on 2021-09-18 09:00:02
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