Den Fri, 13 Apr 2018 21:59:10 +0200 skrev Gerrit Heitsch <gerrit@laosinh.s.bawue.de>: > On 04/13/2018 09:10 PM, Mia Magnusson wrote: > > Den Fri, 13 Apr 2018 17:46:27 +0200 skrev Michał Pleban > > <lists@michau.name>: > >> Hello! > >> > >> Gerrit Heitsch wrote: > >> > >>> A 4464 cannot be put in place of a 4164, so I don't quite see how > >>> to make that 'solderless'... Could you provide a bit more detail? > >> > >> The high-profile board has 128 kB soldeded and sockets for > >> additional 128 kB RAM. The board with 4464's would go into these > >> sockets. > > > > You might aswell go for 41256 or 44256 then. > > 44256 need more refresh... 41256 and 4464 use 8 Bit refresh, just > like most 4164, but the 44256 need a 9 Bit refresh which you will > have to generate in some way or you will lose data. Oh, thanks, I've totally missed that. The signal that controls the existing refresh counters seems to be available in the expansion connector as RDY which would need to be combined with P2REFGNT in the coprocessor socket. Those two combined could control a counter for the extra bits a 44256 (or higher) needs. -- (\_/) Copy the bunny to your mails to help (O.o) him achieve world domination. (> <) Come join the dark side. /_|_\ We have cookies.Received on 2018-04-13 23:02:24
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