

;	CP/M disk control block equates which define the
;	disk types and maximum storage capability of each
;	disk type.

;	CP/M to host disk constants

hstsiz	EQU	1024		;blocking/deblocking buffer size
cpmsib	EQU	1024/128	;standard sectors in block
fpysib	EQU	2048/128	;sectors in floppy disk block
hblksiz	EQU	4*1024		;M20 block size
hhstsiz	EQU	512		;M20 bytes per sector
hdspt	EQU	21		;M20 physical sectors per head/track
hhstspt	EQU	hdspt*8		;M20 physical sectors per track
hhstblk	EQU	hhstsiz/128	;M20 CP/M records per physical sector
hcpmspt	EQU	hhstblk*hhstspt	;M20 CP/M records per track
hardsib	EQU	hblksiz/128	;standard records in hard disk data block


dskhd	EQU	8		;hard drive, 512-byte sectors
s1dsm	EQU	((77-2)*26)/cpmsib
s2dsm	EQU	((77-2)*2*26)/fpysib
d1dsm	EQU	((77-2)*2*26)/fpysib
d2dsm	EQU	((77-2)*2*2*26)/fpysib
d3dsm	EQU	((77-2)*4*15)/fpysib
d4dsm	EQU	((77-2)*2*4*15)/fpysib
d5dsm	EQU	((77-2)*8*8)/fpysib
d6dsm	EQU	((77-2)*2*8*8)/fpysib
h0dsm	EQU	97*hcpmspt/hardsib	;1st 97 tracks of M20
h1dsm	EQU	h0dsm			;2nd 97 tracks of M20
h2dsm	EQU	49*hcpmspt/hardsib	;last 49 tracks of M20

ndsk	EQU	5		;number of logical disk drives
csvflen	equ	256/4		;csv length for floppies
alvflen	equ	(d6dsm+7)/8	;alloc vector length for floppies
alvh0ln	EQU	(h0dsm+7)/8	;alv length for logical hard drive 0
alvh1ln	EQU	(h1dsm+7)/8	;alv length for logical hard drive 1
alvh2ln	EQU	(h2dsm+7)/8	;alv length for logical hard drive 2
