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83 lines
2.5 KiB
Plaintext
83 lines
2.5 KiB
Plaintext
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;************************************************
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;* Disk System Header Equate File *
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;* File name: diskhdr.equ *
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;* Last update: 11/10/83 *
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;************************************************
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;
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; Read and Write disk parameter equates
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;
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; At the disk read and write function entrys
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; all disk I/O parameters are on the stack
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; and the stack at these entrys appears as
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; follows:
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;
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; +-------+-------+
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; +14 | DRV | MCNT | Drive and Multi sector count
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; +-------+-------+
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; +12 | TRACK | Track number
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; +-------+-------+
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; +10 | SECTOR | Physical sector number
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; +-------+-------+
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; +8 | DMA_SEG | DMA segment
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; +-------+-------+
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; +6 | DMA_OFF | DMA offset
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; +-------+-------+
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; +4 | RET_SEG | BDOS return segment
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; +-------+-------+
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; +2 | RET_OFF | BDOS return offset
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; +-------+-------+
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; SP+0 | RET_ADR | Local entry return address
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; +-------+-------+
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;
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; These parameters may be indexed and modifide
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; directly on the stack and will be removed
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; by the BDOS after the function is complete
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; These are the euates for the above pictured data structure
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DRIVE equ byte ptr 14[bp]
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MCNT equ byte ptr 15[bp]
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TRACK equ word ptr 12[bp]
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SECTOR equ word ptr 10[bp]
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DMASEG equ word ptr 8[bp]
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DMAOFF equ word ptr 6[bp]
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; These equates are for the DPH's
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xlt equ word ptr 0 ; tranalation table offset in dph
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dpb equ word ptr 8 ; disk parameter block offset in dph
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mf equ byte ptr 5 ; disk specific media flag
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; These equates are for the DPB's
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spt equ 0 ; sectors per track offset in dpb
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psh equ 15 ; physical shift factor offset in dpb
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; Retry equates
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RW_RECAL_COUNT EQU 5 ; Max number of recals
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RETRY_COUNT EQU 10 ; Max number retries
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; Path tracer equates
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PATH_ENTRY EQU word ptr 0 ; Path counter when routine entered
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PATH_EXIT EQU word ptr 2 ; Path counter when routine exited
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LAST_RETRY EQU word ptr 4 ; Retry counter at last exit
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LAST_RETURN EQU word ptr 6 ; Last returned value
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USE EQU word ptr 8 ; number of time routine called
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RETRY_SUM EQU word ptr 10 ; sum of all retry attempts
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RETRY1_SUM EQU word ptr 12 ; sum of all retry attempts
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RECAL_SUM EQU word ptr 14 ; sum of all retry attempts
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PATH_RETRY_HIST EQU 16 ; length of above data structure
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