On Tue, 5 May 2015, Martin Hoffmann-Vetter wrote: > Hallo William, > Yes, it think too, this 970150-07 must be near to 901474-03 with changed > crtc registers. But it's possible, they changed anything else, too. I think it more likely a 901447-29 with crtc initialization added. >> This could also be used with an adapter to drive external >> monitors. The 50Hz PAL is probably for an external monitor, otherwise >> there is no reason to make it PAL compatible. In which case, monitor >> size doesn't matter. > > Isn't it? This 901474-04_ can be for an european system board replacement > with 50 Hz. This must be working with a 9" crt. The changes about 970150-07 > and 901774-04_ must be the 50 / 60 Hz difference. So 901774-04_ looks to > 970150-07 as 901774-04 to 901774-03! Was there a different system board for the European thin 40 or was there just a different video board? The system board would not need to be different and the power transformer could be wired to be either 220 or 110 V. The ramp generator for the horzontal sync would have to be different. However, this could be accomplished by changing the capacitor in the horizontal ramp generator. wlevak@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org Message was sent through the cbm-hackers mailing listReceived on 2015-05-06 21:00:06
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