On 2012-10-07, at 12:44, silverdr@wfmh.org.pl wrote: > > I did it eventually (and lost last night completely in order for "Inbetriebnahme".. :-) and it works... sort of.. > > The sort of part is that while the machine boots to BSOL most of the times (and when it does I have both charsets too), sometimes it doesn't. And what's worse whenever I plug in my IDE64 it never boots to BSOL but sometimes shows an interesting picture: > > http://dl.dropbox.com/u/58002657/cbm/c64/2012-10-07%2012.29.07.jpg > > (note the vertical bars in the border - probably some kind of Soci's signature? - and the charset too) > > and sometimes just ends with a black screen.. any ideas? I used 200ns EPROM but checked also faster ones with the same or worse results. My 150ns for example never booted to BSOL nor showed the IDE64 mysterious screen. 120ns behaves similar to 200. While it doesn't make much sense, I still tried uncoupling the _CS from _OE but as expected there was no difference in behaviour. > > Something is really strangely off / on the verge of specs here. Any help ideas? Thinking aloud as I don't have a scope here at hand to verify.. could it be that PLA's outputs are not fully compatible with the LS inputs? When sinking off the original ROMs there are no pullups nor anything else on the way. Maybe we need something when connecting those outputs to the LS? -- SD! Message was sent through the cbm-hackers mailing listReceived on 2012-10-07 12:00:12
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