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40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
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; CP/M disk control block equates which define the
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; disk types and maximum storage capability of each
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; disk type.
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; CP/M to host disk constants
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hstsiz EQU 1024 ;blocking/deblocking buffer size
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cpmsib EQU 1024/128 ;standard sectors in block
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fpysib EQU 2048/128 ;sectors in floppy disk block
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hblksiz EQU 4*1024 ;M20 block size
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hhstsiz EQU 512 ;M20 bytes per sector
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hdspt EQU 21 ;M20 physical sectors per head/track
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hhstspt EQU hdspt*8 ;M20 physical sectors per track
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hhstblk EQU hhstsiz/128 ;M20 CP/M records per physical sector
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hcpmspt EQU hhstblk*hhstspt ;M20 CP/M records per track
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hardsib EQU hblksiz/128 ;standard records in hard disk data block
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dskhd EQU 8 ;hard drive, 512-byte sectors
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s1dsm EQU ((77-2)*26)/cpmsib
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s2dsm EQU ((77-2)*2*26)/fpysib
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d1dsm EQU ((77-2)*2*26)/fpysib
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d2dsm EQU ((77-2)*2*2*26)/fpysib
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d3dsm EQU ((77-2)*4*15)/fpysib
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d4dsm EQU ((77-2)*2*4*15)/fpysib
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d5dsm EQU ((77-2)*8*8)/fpysib
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d6dsm EQU ((77-2)*2*8*8)/fpysib
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h0dsm EQU 97*hcpmspt/hardsib ;1st 97 tracks of M20
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h1dsm EQU h0dsm ;2nd 97 tracks of M20
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h2dsm EQU 49*hcpmspt/hardsib ;last 49 tracks of M20
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ndsk EQU 5 ;number of logical disk drives
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csvflen equ 256/4 ;csv length for floppies
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alvflen equ (d6dsm+7)/8 ;alloc vector length for floppies
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alvh0ln EQU (h0dsm+7)/8 ;alv length for logical hard drive 0
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alvh1ln EQU (h1dsm+7)/8 ;alv length for logical hard drive 1
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alvh2ln EQU (h2dsm+7)/8 ;alv length for logical hard drive 2
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