On 10/06/2018 08:52 PM, Mia Magnusson wrote: > Den Sat, 6 Oct 2018 19:52:23 +0200 skrev Francesco Messineo > <email@example.com>: >> On Sat, Oct 6, 2018 at 7:45 PM Gerrit Heitsch >> <firstname.lastname@example.org> wrote: >>> >>> >>> Well, this version is using an early version of the Zorro bus, the >>> whole logic implemented in PALs and TTLs and not a BUSTER chip as >>> in the later A2000 where AGNUS came in 84pin PLCC instead of 48pin >>> DIP. There are some problems with the bus protocol on the Zorro >>> slots. > > Well, the "protocol" itself is mostly just the autoconfig process, > which is super simple to implement (and most likely not a problem). The > problems it might have seems more likely to be of the analogue kind, > i.e. reflections or similar. > > That might, or might not, be an issuie in your case. All interesting signals (address, data and some control signals) for the Zorro slots have to go through a bunch of 74LS245, so reflections on the long traces for the slots can't be the issue. GerritReceived on 2018-10-06 22:00:05
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