:> HARDWARE PROPOSAL:
:> ------------------
:> In stead of building an internal 3.58MHz clock in all SCC's, Audio's and
:> Musics it would be convenient to have a fixed 3.58MHz clocksignal
:> available on the cartridgeconnector and also a 'BUSCLOCK' which reflects
:> the processor's speed. My proposal is to use pin16 for this (currently
:> 'Reserved')
:
:The idea is excellent....I had it some 3 years ago, BUT:
:
:There's no way you can 'standardise' this somehow. No matter what
:reserved cartridge-pin you take, or what signals you put on them,
:you'll always have the same problem:
:
:You'll have to modify SOME cartridges to work in a modified machine,
:or some modified cartridges won't work in non-modified machines,
:and/or some non-modified cartridges won't work in modified machines.
Yup, he's completely correct. Just run your machine on 3.5MHz if you want to
hear the music correct or build a 3.5MHz clock chrystal in the cartridge...
:Do this for yourself, for your computer(s) & your cartridges,
:fine, but I would not support any attempt to set some standard for
:these modifications. That would only be a source of problems for
:years to come....
:
:If you do, I suggest you make it switchable, such that in one state,
:it works like non-modified (like with turbo-circuits: switch it off,
:and it works like it wasn't there).
:
:Putting a fixed frequency signal, and a variable CPU clock/bus speed
:signal, side by side on a cartridge-connector is a good thing, but
:for the MSX system, the chance to do so was lost with the definition
:of the MSX standard, no way to re-do this.
Another idea: if someone can make some "in-between-cartridge", which you
have to put in the cartridge-slot and then you'll have to put the expansion
you want to run on 3.5MHz in this cartridge (so this cartridge has got 1
male and 1 female connector). This cartridge contains a 3.5MHz clock
chrystal... And in the case of the MSX-Audio... Another cartridge to send a
wait-state to the MSX everytime I/O-acces is done??? With a switch,
ofcourse, so that you can switch it on when nessacary... Or maybe put both
those thingies in one cartridge... Shouldn't be too expensive... (would 25
guilders be a realistic price??? I would certainly pay that for it...)
~Grauw
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