I don't know, i think the.memotecs used dynamic memory which means their will be sone sort of refresh mechanism, so it very likely that it won't work with such memory...
What I can say is that is if a memory expansion can be used for hi-res graphics then it is likely to work with the UDG board.
Regards Andy
Last edited by Andy Rea on Fri Sep 01, 2017 1:30 pm, edited 1 time in total.
what's that Smell.... smells like fresh flux and solder fumes...
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Andy Rea wrote: ↑Thu Aug 24, 2017 8:15 pm
A new plug in board that allows the use of external WRX enabled memory
Hi Andy.
I have got a new (old ) Zeddy, having an external 64KByte-Ram of unknown type (probably no WRX). Do you think that it is possible to use your interface (maybe after an update to make also WRX in a "standard" external ram) for that Zeddy?
As i sure your aware for video patterns to be successfully retrieved from ram ( internal or external ) that ram has to be active during refresh, if that ram is static ram then usually it can be altered ( sometimes extra logic is required ) to be active during the refresh, with dynamic rams it can be much harder to achieve.
The UDG board intercepts the zeddies external address lines ( A0 thru A10) and only during refresh the alternate address is placed on the thru address bus, at all other times the original signal is a pass thru as are all the other signals on the edge connector.
Regards Andy
what's that Smell.... smells like fresh flux and solder fumes...