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+--- Thread: cpm hdd (/thread-817.html)
cpm hdd - paulmackay - 07-07-2024
this is about cpm....
how can we break the 8mg hdd partition barrier..
is this a software block or hardware
RE: cpm hdd - ChickenMan - 07-07-2024
An 8bit Z80 limitation I believe, so hardware.
RE: cpm hdd - greybeard - 07-07-2024
128 byte sector * 65536 ~= 8MB max for a cpm2.2 logical partition
16 bit maths limitation in bdos
You will also be constrained by the maximum directory entries.
use cpm 3 or rewrite bdos
8MB of cpm files is a hell of a lot of files. trying to navigate that many files with only 16 user sections to put them in is also going to be fun.
ymmv
RE: cpm hdd - paulmackay - 08-07-2024
(07-07-2024, 11:55 PM)greybeard Wrote: 128 byte sector * 65536 ~= 8MB max for a cpm2.2 logical partition
16 bit maths limitation in bdos
You will also be constrained by the maximum directory entries.
use cpm 3 or rewrite bdos
8MB of cpm files is a hell of a lot of files. trying to navigate that many files with only 16 user sections to put them in is also going to be fun.
ymmv
I am not up to date on cpm. whatis the 16 X users and will cpm3 run cpm 2.2 (microbee software). also what would the difference be between 2.2 and 3.0 for harddisk use (size, maybe sub directories)
RE: cpm hdd - greybeard - 11-07-2024
Best way to get up to date with cpm would be to spend some time with google. Otherwise none of the responses will make any sense