[EMAIL PROTECTED] schreef:
>
> Hello, after studying the schematics of the NMS 8250 i found out that the msx-machine
> has at least two pins which are not connected.
> The pins are called SLT1/01 and CAS3.
> For this machine slot 1 is an external slot.
>
> Is there a msx which has cas3 connected ? (256 K internal ram?)
> Where can the slot 1 page 1 selection line be used for ? (internal rs232 ?)
>
> greetz,
>
these pins , from the msx engine , are used for different slot
configurations.
it depends on some diode's on the keyboard matrix how this engine will
work
(it's somewhere in the tech doc's )
cas 3 is for ram in slot 0 on adres space 8000h - ffffh (msx1 with 32k
rom and 32kram)
slt01/31 (slot 3-1 on this configuration) can be easy when you build in
dos2
(or rs232 bios but that almost never used and for rs232 i/o you do not
need a slot)
(and for 256K ram you need some extra wires on ic149)
erik de boer
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