At 04:55 PM 5/20/98 +0200, you wrote:
>The standard does not say that mapper register may be read.
They would have saved a lot of trouble if they stated it more explicit...
>As far as I know the only problem child with the mapper-page-read-back
>method is the turbo-R...
Also some MSX2+ models.
>hmmmm.... if this readback would be the standard, 4 bytes of data RAM
would >be saved, even more
>would be save because the opcodes to read them are shorter...
All mappers use ports FC-FF. More than one mapper can be present in a
system. When writing, no problem, all mappers accept the same value. When
reading, there is a problem when two mappers want to return different
values (for example because they are not equally large).
Bye,
Maarten
****
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body (not subject) "unsubscribe msx [EMAIL PROTECTED]" (without the
quotes :-) Problems? contact [EMAIL PROTECTED] (www.stack.nl/~wiebe/mailinglist/)
****
