johnf@runx.ips.oz (John F. Baird) (05/13/88)
Does anybody know if DOSREAD, DOSWRITE and DOSDIR on Minix 1.2
can read and write 3 1/2" MSDOS disks?. DOSREAD etc on 1.1
works out the disk's "dimensions" via the "Media Descriptor"
byte in the first entry of the FAT table. It will thus
confuse 720k disks with 1.2M. I've just re-written it to use
the info in the boot sector - so it now copes with virtually
ANY format. I'll post it to the group (or wherever) if
Minix 1.2's hasn't been "updated". It's also got a lot of other
mods to allow it to run on my Applix (don't worry, you wont
have heard of it) under it's OS (which can't open /dev/fd?
files), but these are all #ifdef'd, so that's ok. Oh yeah;
another thing:- can anyone explain why DOSREAD doesnt just
do calls to "printf" etc etc. Why does it have all that
"print_string" stuff?. why not use printf directly? (my
modified version does - will it still work on Minix?).
Thankx,
Greyham
* Greyham Stoney:
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UUCP: {enea,hplabs,mcvax,prlb2,seismo,ubc-vision,ukc}!munnari!utscsd.oz!greyhamhuisjes@cs.vu.nl (Michiel Huisjes) (05/18/88)
In article <1516@runx.ips.oz> johnf@runx.ips.oz (John F. Baird) writes: > Does anybody know if DOSREAD, DOSWRITE and DOSDIR on Minix 1.2 > can read and write 3 1/2" MSDOS disks?. DOSREAD etc on 1.1 > ... > ... Oh yeah; > another thing:- can anyone explain why DOSREAD doesnt just > do calls to "printf" etc etc. Why does it have all that > "print_string" stuff?. why not use printf directly? (my > modified version does - will it still work on Minix?). > Thankx, > Greyham The original version of dosread/write/dir as written by me, could only handle 360K and 1.2M diskettes. Watch out for patches that include diskettes (hard-disks) of which the FAT entries are not 1.5 but 2 bytes. Also you will have to check the amount of bytes used for the Root directory and both FAT tables. I left out the "stdio" library and inserted this limited version of print_string, because by the time I wrote dosr/w/d, there were serious troubles concerning the amount of disk space left. Using print_string kept the binary about 3 or 4K smaller. -- Michiel Huisjes. (huisjes@cs.vu.nl) {seismo|decvax|philabs}!mcvax!vu44!huisjes