At 04:16 PM 05/22/98 +0200, you wrote:
>> If you want to avoid the mapper problem, expand to 512K. Only larger
>> mappers have the problem.
>
>Are you saying that I can expand my computer to 512 kb without
>problems? (internally or externally?)
Yes. In the S1990 the upper 3 bits are fixed to '1'. So the lower 5 bits
work. 5 bits gives you 2^5 = 32 pages, 32*16K = 512K.
Note that if you use an external mapper of a different size that the
internal mapper, you will get the problem of two mappers returning
different sizes when read. Although this probably will work correctly (it
did in my NMS8250), it might damage your MSX in the long run (although I'm
not sure, I'm not really good at hardware). But this problem is not related
to the S1990 problem, it will happen in any MSX.
Anyway, an internal expansion has the advantage that you have one more free
slot. Also some programs (mainly poorly cracked games) assume your RAM is
in slot 3.
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/)
****
