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OK240.2-Firmware/CPM_v2.2_r7_b89a7e16/cpm_vars.inc

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; =======================================================
; Ocean-240.2
; Module CPM - BIOS/BDOS/CPP variables
; RAM Range: 0xba09-0xbf00
;
; Disassembled by Romych 2025-09-09
; =======================================================
IFNDEF _CPM_VARS
DEFINE _CPM_VARS
MODULE CPM_VARS
ORG 0xba09
cpm_vars_start EQU $
; Filled by zeroes by BIOS at cold boot
; until ccp_vars_end
; Output disabel if non zero
bdos_no_outflag DS 1
bdos_strtcol DS 1
bdos_column DS 1
; Copy output to printer in non zero
bdos_prnflag DS 1
bdos_kbchar DS 1
; Stored user stack pointer on enter bdos fn
bdos_usersp DS 2 ; 0xba0e
; BDOS Stack
DS 48
bdos_stack EQU $
; -------------------------------------------------------
; Common values shared between bdosi and bdos
; -------------------------------------------------------
; current user number 0..15
bdos_userno DS 1 ; 0xba40
; current disk number
bdos_curdsk DS 1
; reg DE (pointer) value to call BDOS fn
bdos_info DS 2 ; 0xba42
; Address value to return
bdos_aret DS 2 ; 0xba44
; Empty FCB
bdos_efcb DS 1 ; 0xba46 = 0xE5 at init
; Read-only disks flag
bdos_rodsk DS 2 ; 0xba47
; Drive login vector
bdos_dlog DS 2 ; 0xba49
; Address of DMA buffer
bdos_dmaad DS 2 ; 0xba4b = 0x80 at init
bdos_cdrmax DS 2 ; 0xba4d
; Current track
bdos_curtrk DS 2 ; 0xba4f
; Current record (sector)
bdos_currec DS 2 ; 0xba51
; Address of user buffer
bdos_buffa DS 2 ; 0xba53
; Address of cur disk DPB
bdos_dpbaddr DS 2 ; 0xba55
; Calculated checksum
bdos_cksum DS 2 ; 0xba57
; Address of cur disk allocation map
bdos_alloca DS 2 ; 0xba59
; Sectors per track
dbos_sectpt DS 2 ; 0xba5b
bdos_blkshf DS 1 ; 0xba5d
bdos_blmsk DS 1 ; 0xba5e
bdos_extmsk DS 1 ; 0xba5f
; Max allocation number (disk size)
bdos_maxall DS 2 ; 0xba60
bdos_dirmax DS 2 ; 0xba62
; Size of directory
bdos_dirblk DS 2 ; 0xba64
bdos_alloc1 DS 2 ; 0xba66
; First track offset
bdos_offset DS 2 ; 0xba68
; Disk traslation vector address
bdos_tranv DS 2 ; 0xba6a
; Open and closed flag 0xff - closed
bdos_fcb_closed DS 1 ; 0xba6c
; Read file modified flag. 0xff - not allow read unwritten
bdos_rfm DS 1 ; 0xba6d
bdos_dirloc DS 1 ; 0xba6e
; File access mode (0=random, 1=sequential, 2=special)
bdos_seqio DS 1 ; 0xba6f
; Reg E value to call BDOS fn
bdos_linfo DS 1 ; 0xba70
bdos_dminx DS 1 ; 0xba71
; Length in bytes to match when search
bdos_searchl DS 1 ; 0xba72
; Address of buffer where to search
bdos_searcha DS 2 ; 0xba73
DS 2
; 0 - big disk (>255 blk), 0xff - small disk
bdos_small_disk DS 1 ; 0xba77
; Drive selected (0xff) by user specified FCB flag
bdos_resel DS 1 ; 0xba78
bdos_olddsk DS 1 ; 0xba79
; Saved disk of user FCB
bdos_fcbdsk DS 1 ; 0xba7a
; Number of records in extent
bdos_rcount DS 1 ; 0xba7b
bdos_extval DS 1 ; 0xba7c
; Record number to read
bdos_vrecord DS 2 ; 0xba7d
; Record to access
bdos_arecord DS 2 ; 0xba7f
bdos_arecord1 DS 2 ; 0xba81
bdos_dptr DS 1 ; 0xba83
bdos_dcnt DS 2 ; 0xba84
;bdos_dcnt_hi DS 1 ; 0xba85
bdos_drec DS 20 ; 0xba86
tmp_dir_total DS 2 ; 0xba9a
; Save pointer at ccp entry, restore on exit
saved_stack_ptr DS 2 ; 0xba9c
DS 22
ccp_safe_stack
DS 2 ; 0xbab4
; --------------------------------------------------
; FCB
; --------------------------------------------------
ccp_FCB
ccp_FCB_DR DS 1 ; 0xbab6 drive letter to write file
ccp_FCB_FN DS 8 ; 0xbab7 file name
ccp_FCB_FT DS 3 ; file type
cpp_FCB_EXT DS 1 ; extent
cpp_FCB_S1 DS 1
cpp_FCB_S2 DS 1 ; extent hi bits
cpp_FCB_RC DS 1
cpp_FCB_AL DS 16 ; Second half of FCB
ccp_FCB_CR DS 1 ; Current record
ccp_FCB_Rn DS 1 ; Random access record number
DS 2
DS 2
DS 2
ccp_vars_end EQU $
; --------------------------------------------------
; Disk parameters headers/blocks in RAM
; --------------------------------------------------
DPH_RAM DS 16, 0 ; 0xbade
DPH1_RAM DS 16, 0
DPH2_RAM DS 16, 0
DPB64K_RAM DS 15, 0 ; 0xbb0e
DPB360K_RAM DS 15, 0 ; 0xbb1d
; --------------------------------------------------
cur_disk DS 1 ; 0xbb2c
dma_addr DS 2 ; 0xbb2d
curr_track DS 1 ; 0xbb2f
curr_sec DS 1 ; 0xbb30
slicer_disk DS 1 ; 0xbb31
slicer_track DS 1 ; 0xbb32
slicer_real_sector
DS 1 ; 0xbb33
tmp_slicer_real_sector
DS 1 ; 0xbb34
slicer_has_data DS 1 ; 0xbb35
slicer_need_save
DS 1 ; 0xbb36
slicer_uninited_count
DS 1 ; 0xbb37
slicer_uninited_disk
DS 1 ; 0xbb38
slicer_uninited_track
DS 1 ; 0xbb39
slicer_uninited_sector_128
DS 1 ; 0xbb3a
tmp_slicer_result
DS 1 ; 0xbb3b
tmp_slicer_can_read
DS 1 ; 0xbb3c
tmp_slicer_operation
DS 1 ; 0xbb3d
tmp_slicer_flush
DS 1 ; 0xbb3e
; The directory buffer is an area used by the BDOS for directory operations.
; There is only one of these for the entire system.
DIRBUFF DS DIR_BUFF_SIZE ; 0xbb3f
; Allocation map for drive A (Mark used allocation blocks)
AL_MAP_A DS 31 ; 248 bit
; Check vector for drive A (Checksumm of dir entries, used to detect disk change)
CHK_VEC_A DS 16 ; 0xbbde
; Allocation map for drive B
AL_MAP_B DS 23 ; 184 bit
; Check vector for drive B
CHK_VEC_B DS 16 ; 0xbc05
; Allocation map for drive C
AL_MAP_C DS 23 ; 184 bit
; Check vector for drive C
CHK_VEC_C DS 16 ; 0xbc2c
DS 196
slicer_buffer DS 512 ; 0xbd00
cpm_vars_end EQU $
ccp_vars_size EQU ccp_vars_end-cpm_vars_start
cpm_vars_size EQU cpm_vars_end-cpm_vars_start
; check integrity of original ROM
ASSERT tmp_dir_total = 0xba9a
ASSERT saved_stack_ptr = 0xba9c
ASSERT ccp_FCB_FN = 0xbab7
ASSERT DPH_RAM = 0xbade
ASSERT slicer_uninited_count = 0xbb37
ASSERT slicer_buffer = 0xbd00
DISPLAY "| CCP_VARS\t| ",/H,cpm_vars_start," | ",/H,cpm_vars_size," |\t |"
ENDMODULE
ENDIF
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