SFD-700/800 .dsk Disk analyse

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Pacman
Posts: 172
Joined: Mon Feb 05, 2018 2:59 pm

SFD-700/800 .dsk Disk analyse

Post by Pacman »

Hello,

I am looking at the contents of .dsk for SFD700 / 800 (+1500) interfaces.

I would like to know 3 things:
- For the SFD-700, is the automatic start of a program detected by $02 + "IPLPRO" ?
- For the SFD-800 (and 1500), is the automatic start of a program detected by $03 + "IPLPRO" ?
- On the catalog sector, the first 32 bytes are reserved :
If I understand correctly the byte [$00]=$80 and [$01]=Disk Identification.
Do the other bytes have a meaning ?

Thank you.
S_U_C
Posts: 69
Joined: Sun Feb 17, 2019 6:41 pm

Re: SFD-700/800 .dsk Disk analyse

Post by S_U_C »

Hi,
the IPLPRO tags are to indicate that a disk is bootable i.e. a system disk.
It contains a short sys-name, size, load , exec address and the start position (logical sector) on the disk.
To stop a machine booting a incorrect system disk each IPLPRO is prefixed with byte.
Sharp used
01 for MZ80B
02 for MZ80A
03 for MZ700
Nice system, but the MZ800 also uses 03 and K&P disks also use 02.
The empty 1st directory entry type 80H is resevred for the SWAP file details.
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Pacman
Posts: 172
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Re: SFD-700/800 .dsk Disk analyse

Post by Pacman »

Hi S.U.C.,

Thank you for the answer.

By SWAP file details, do we mean that the reserved area is used in temporary memory to have the details of a particular file without having to access the declaration area in the catalog itself?
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