Re: Buffers

From: Andre Fachat (a.fachat_at_gmx.net)
Date: 2000-09-13 08:09:45

Maybe at the weekend I can produce a map. Anyway, there is some info on
the
funet, pub/cbm/drives/old/8050 or so. And VICE already implements the
memory
map.

Andre

g.j.p.a.a.baltissen@kader.hobby.nl wrote:
> 
> Hallo allemaal,
> 
> Reading "User's manual for CBM5 1/4 inch Dual Floppy Disk Drives" (October
> 1980, P/N 320899, page 47), I read that such a drive has 16 buffers of
> which 3 are used by the machine itself. 16 buffers is equivalent to 4K, no
> problem here. The example for "memory-execute" (page 51) says "writes four
> bytes to buffer 2 ($1200 or decimal 4608)".
> 
> Questions:
> -     Regarding the above, the 4 KB of RAM is not in one row. Who knows the
>       memory mapping of the RAM? (obviously NOT $0000 - $0FFF)
> 
> -     Which buffernumber is coupled to which memory area?
> 
> -     According my info the 1581 has 4 buffers. But it also has 8 KB of
>       RAM. How many buffers has the 1581 indeed?
> 
> -     The memory mapping of these buffers?
> 
> Many thanks.
> 
> Groetjes, Ruud
> 
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