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Subject:
ISA BUS question
From:
Giampaolo Bellini <[log in to unmask]>
Reply To:
PCBUILD - Personal Computer Hardware discussion List <[log in to unmask]>
Date:
Wed, 19 May 2004 09:57:40 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (21 lines) 
Hi all...

I have a question regarding the ISA bus: looking at the specs, it seems
that a device can drive the MEMCS16 signal if it want to be serviced
with a 16 bit data bus.
But MEMCS16 is decoded from SA17-SA23 lines address... so it seems that
I cannot have a 16bit device in the low memory (under 0x03FFFF)... is
this right ?

also... can I address an IO device and a memory-mapped device in the
same space (for example at 0xd000) ?

thanks a lot for any comments...


        Giampaolo Bellini

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