mirror of
https://github.com/SEPPDROID/Digital-Research-Source-Code.git
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184 lines
3.8 KiB
Plaintext
184 lines
3.8 KiB
Plaintext
;****************************************************
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;*
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;* Globals
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;*
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;****************************************************
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.global _T0S0, _T1S0, _T1S1
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;****************************************************
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;*
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;* Constants
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;*
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;****************************************************
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SYSTEM .equ 0A000000h ; system address
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SYSSTK .equ SYSTEM+0BFFEh ; system stack top
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rtc_ext .equ 02000022h ; real-time clock
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; ext. call addr
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BPT .equ 16 ; #blocks in a track
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BPS .equ 256 ; #bytes in a sector
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NBLKS .equ 2*16 ; #blocks in boot
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HDRSIZE .equ 24 ; #bytes in header
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FILSIZE .equ 256*(NBLKS-1) ; file data size
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SYSSIZE .equ FILSIZE-HDRSIZE ; total system size
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S1SIZE .equ BPS-HDRSIZE ; data in sector 1
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SEG4 .equ 04000000h
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SEG2 .equ 02000000h
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SYSPSA .equ SEG2+100h ; system PSA
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BOOTPSA .equ SEG4+100h ; PSA in PROM for boot
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;****************************************************
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;*
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;* Track 0 Sector 0
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;*
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;* This sector contains the pointer to the
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;* bootstrap file's FDB.
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;*
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;****************************************************
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__data: .sect
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_T0S0:
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.byte 0 ; major version
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.byte 0 ; minor version
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.word 40 ; #tracks/surface ?? 35 ??
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.byte 2 ; #surfaces
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.byte 16 ; #sectors/track
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.word 256 ; #bytes/sector
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.word 40 ; ??? track # of control blk
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.word 38h ; ??? vdb size
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.word 136 ; ??? block bitmap size
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.byte 30 ; ??? directory bitmap size
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.byte 0 ; ??? track count direction ???
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.byte 0 ; number of uses (if 0, no boot)
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.byte 0 ; copy protection (OFF)
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.byte 0 ; boot block read protect (OFF)
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.byte 0 ; boot block write protect (OFF)
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.word 0 ; soft error count
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.word 0 ; hard error count
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.word 0 ; lowest useable track side 0 ?1?
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.word 39 ; highest
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.word 0 ; side 1
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.word 39 ;
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.word 0 ; side 2
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.word 0 ;
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.word 0 ; side 3
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.word 0 ;
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.long BPT ; BOOT FILE FDB BLOCK NUMBER
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.byte "PCOS" ; system name??
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.long 2 ; ??? directory start addr
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.long 0 ; ??? drive data ???
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.long 0
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.long 0
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.long 0
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.long 0
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.word 1 ; disk valid (VALID)
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.byte 0 ; drive number required ???
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.byte 0 ; disk open
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.byte 0 ; format major version #
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.byte 0 ; minor
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.byte 2 ; disk type = 320Kb
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.byte 0 ; 27 bytes of nothing
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.byte 0 ; 26
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.byte 0 ; 25
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.byte 0 ; 24
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.byte 0 ; 23
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.byte 0 ; 22
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.byte 0 ; 21
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.byte 0 ; 20
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.byte 0 ; 19
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.byte 0 ; 18
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.byte 0 ; 17
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.byte 0 ; 16
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.byte 0 ; 15
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.byte 0 ; 14
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.byte 0 ; 13
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.byte 0 ; 12
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.byte 0 ; 11
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.byte 0 ; 10
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.byte 0 ; 9
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.byte 0 ; 8
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.byte 0 ; 7
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.byte 0 ; 6
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.byte 0 ; 5
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.byte 0 ; 4
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.byte 0 ; 3
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.byte 0 ; 2
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.byte 0 ; 1
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.block 22 ; forgotten, aparently
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;****************************************************
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;*
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;* Track 1 Sector 0
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;*
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;* This sector is the FDB for the bootstrap
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;* file. It has a single extent.
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;*
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;****************************************************
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_T1S0:
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.long FILSIZE ; file length in bytes
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.word 1 ; #extents
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.byte 0 ; 14 password (14 bytes)
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.byte 0 ; 13
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.byte 0 ; 12
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.byte 0 ; 11
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.byte 0 ; 10
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.byte 0 ; 9
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.byte 0 ; 8
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.byte 0 ; 7
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.byte 0 ; 6
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.byte 0 ; 5
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.byte 0 ; 4
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.byte 0 ; 3
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.byte 0 ; 2
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.byte 0 ; 1
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.word 0 ; ??? verify location ???
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.byte 0 ; write protect
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.byte 0 ; future
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.long BPT+1 ; STARTING BLOCK OF EXTENT
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.word NBLKS-1 ; NUMBER OF BLOCKS IN EXTENT
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.block 222 ; other extents
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.long 0 ; next fdb
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;****************************************************
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;*
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;* Track 1 Sector 1
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;*
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;* This sector is the header for the bootstrap
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;* file, followed by the first S1SIZE bytes of
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;* data, which are copied in.
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;*
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;****************************************************
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_T1S1:
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.word 0101h ; magic number
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.byte "PCPM" ; identifier
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.byte "x01."
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.byte "01"
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.long SYSTEM ; starting addr.
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.word 1 ; #code blocks
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.long SYSTEM ; load address
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.word SYSSIZE/2 ; #words
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s1data .block S1SIZE ; data area
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