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Re: ProDOS Plus
mdj <mdj.mdj@gmail.com> wrote:
>> Sparse files were available already in Apple DOS 3.3 as well as in CP/M-80,
>> both of which predated ProDOS.
>
> Curious. I never saw one in DOS 3.3, and didn't do a lot with CP/M.
Random-access text files can be sparse. For example, in the CiderPress
tutorial sample disk image (an 800K disk with a DOS partition), there's a
sparse file called "RANDOM:L128":
Name Type Auxtyp Modified Format Length
------------------------------------------------------------------------------
TestFiles DIR $0000 17-Jan-03 19:27 ProDOS 512
TestFiles:SPARSE NON $0000 11-Jan-03 16:24 ProDOS 16777215
TestFiles:EMPTY.SPARSE NON $0000 11-Jan-03 15:54 ProDOS 43969
TestFiles:EMPTY.SPARSE.R NON+ $0000 11-Jan-03 15:51 ProDOS 6844
[...]
_DOS001:RANDOM:L128 TXT $0000 [No Date] DOS 384030
I hadn't realized that was possible until I had to implement them. :-)
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