A2osX/.Docs/LIBBLKDEV.md
2018-10-11 17:23:06 +02:00

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GetProDOSCatSize

Compute space needed for ProDOS Catalog

C

int getprodoscatsize (short int options, short int catsize, int devsize );

ASM

In:
PUSHW = DevSize (in 512b blocks)
PUSHB = Catalog Size (in blocks)
PUSHB = Options

RETURN VALUE

X=BlockCount (max 22)
Y,A=BufSize (max $4400)

BuildProDOSCat

In:
PUSHW = DevSize (in 512b blocks)
PUSHB = Catalog Size (in blocks)
PUSHB = Options
PUSHW = VolName (PSTR)
PUSHW = DstBuf (Zero filled)
Blk0 : ProDOS.BootBlk
Blk1 : SOS.BootBlk
Blk2...n : Volume Directory
Blkn+1.. : Volume Bitmap (4096/Blk)
max devSize = 65535 -> max 16 Bitmap Blk
absolute MAX DstBuf size=
7 for Disk II(280blk),3.5(1600),3.5HD(2880)
22 for 32mb Hardisk...

TrkW16s

Write a track (16 sectors)
In:
PUSHW = Ptr to 16*256 buffer
PUSHB = TrackNum * 4 : 0->140+
PUSHB = DSSS0000

RETURN VALUE

CC : success
CS : A = Error
A=0, currently starting/seeking...

TrkWNIB

Write a track (NIBBLE)
In:
PUSHW = Ptr to NIBBLE buffer (0 ended)
PUSHB = TrackNum * 4 : 0->140+
PUSHB = DSSS0000

RETURN VALUE

CC : success
CS : A = Error
A=0, currently starting/seeking...