208 lines
7.2 KiB
ArmAsm
208 lines
7.2 KiB
ArmAsm
;
|
|
; Memory locations for the DOS
|
|
;
|
|
|
|
; NOTES:
|
|
; - starting from $8000, 16KB RAM is available (starting from $10000 in C65 address space)
|
|
; - additional 16KB RAM is reserved for DOS too ($14000-$17FFF), and can be banked-in if needed
|
|
|
|
|
|
;
|
|
; Temporary storage locations
|
|
;
|
|
|
|
!addr FS_HVSR_DIRENT = $1000
|
|
|
|
|
|
;
|
|
; Page start+0
|
|
;
|
|
|
|
!addr MAGICSTR = $8000 ; magic string; if not matching, DOS considered non-functional
|
|
|
|
; Register storage
|
|
|
|
!addr REG_A = $8005
|
|
!addr REG_X = $8006
|
|
!addr REG_Y = $8007
|
|
!addr REG_Z = $8008
|
|
|
|
; System configuration
|
|
|
|
!addr RAM_ATTIC = $8009 ; $8000000-$87FFFFF RAM status; 0 = not present, $FF = present
|
|
!addr RAM_CELLAR = $800A ; $8800000-$8FFFFFF RAM status; 0 = not present, $FF = present
|
|
|
|
; Reserved: $800B - $800C
|
|
|
|
; General DOS configuration
|
|
|
|
!addr UNIT_SDCARD = $800D ; unit number for device, 0 = none
|
|
!addr UNIT_FLOPPY = $800E ; as above
|
|
!addr UNIT_RAMDISK = $800F ; as above
|
|
|
|
; General DOS status
|
|
|
|
!addr IDX1_LISTENER = $8010 ; listener idx, >=$80 = none
|
|
!addr IDX2_LISTENER = $8011 ; listener idx * 2, >=$80 = none - for calling routines via vector table
|
|
!addr IDX1_TALKER = $8012 ; talker idx, >=$80 = none
|
|
!addr IDX2_TALKER = $8013 ; talker idx * 2, >=$80 = none - for calling routines via vector table
|
|
|
|
; Helper subroutines to fetch data
|
|
|
|
!addr code_LDA_nnnn_Y = $8014 ; - LDA nnnn, Y instruction
|
|
!addr par_LDA_nnnn_Y = $8015 ; - 2 bytes; address
|
|
!addr code_RTS_04 = $8017 ; - RTS instruction
|
|
|
|
; Parameters for utilities/helpers
|
|
|
|
!addr PAR_TRACK = $8018 ; track number, also for status/error
|
|
!addr PAR_SECTOR = $8019 ; sector number, also for status/error
|
|
|
|
!addr PAR_FSIZE_BYTES = $801A ; 4 bytes - file size in bytes
|
|
!addr PAR_FSIZE_BLOCKS = $801E ; 2 bytes - file size in blocks
|
|
|
|
!addr PAR_FTYPE = $8020 ; bits 0-5 - type, bits 6-7 - protected, closed
|
|
!addr PAR_FNAME = $8021 ; 16 bytes - filename, filled with $A0
|
|
!addr PAR_FPATTERN = $8031 ; 16 bytes - pattern to match, filled with $A0
|
|
|
|
; Various temporary data
|
|
|
|
!addr XX_DIR_PHASE = $8041 ; directory output phase, values deponds on device driver, but 0 = not reading
|
|
!addr SD_DIR_PHASE = $8041 ; - SD card
|
|
!addr FD_DIR_PHASE = $8042 ; - floppy
|
|
!addr RD_DIR_PHASE = $8043 ; - ram disk
|
|
|
|
; Free space: $8044-$8063
|
|
|
|
!addr SD_ACPTR_helper = $8052 ; subroutine in RAM to read a byte
|
|
!addr code_LDA_01 = $8052 ; - LDA instruction
|
|
!addr SD_ACPTR_PTR = $8053 ; - 2 bytes; address in buffer, SD card
|
|
!addr code_RTS_01 = $8055 ; - RTS instruction
|
|
|
|
!addr FD_ACPTR_helper = $8056 ; subroutine in RAM to read a byte
|
|
!addr code_LDA_02 = $8056 ; - LDA instruction
|
|
!addr FD_ACPTR_PTR = $8057 ; - 2 bytes; address in buffer, floppy
|
|
!addr code_RTS_02 = $8059 ; - RTS instruction
|
|
|
|
!addr RD_ACPTR_helper = $805A ; subroutine in RAM to read a byte
|
|
!addr code_LDA_03 = $805A ; - LDA instruction
|
|
!addr RD_ACPTR_PTR = $805B ; - 2 bytes; address in buffer, ram disk
|
|
!addr code_RTS_03 = $805D ; - RTS instruction
|
|
|
|
!addr XX_ACPTR_LEN = $805E ; 2 bytes - length of data left for ACPTR
|
|
!addr SD_ACPTR_LEN = $805E ; - SD card
|
|
!addr FD_ACPTR_LEN = $8060 ; - floppy
|
|
!addr RD_ACPTR_LEN = $8062 ; - ram disk
|
|
|
|
!addr XX_MODE = $8064 ; current mode (0 = none, 1 = receiving command/file name)
|
|
!addr SD_MODE = $8064 ; - SD card
|
|
!addr FD_MODE = $8065 ; - floppy
|
|
!addr RD_MODE = $8066 ; - ram disk
|
|
|
|
!addr XX_CHANNEL = $8067 ; current channel
|
|
!addr SD_CHANNEL = $8067 ; - SD card
|
|
!addr FD_CHANNEL = $8068 ; - floppy
|
|
!addr RD_CHANNEL = $8069 ; - ram disk
|
|
|
|
!addr XX_CMDFN_IDX = $806A ; index byte for storing file name/command
|
|
!addr SD_CMDFN_IDX = $806A ; - SD card
|
|
!addr FD_CMDFN_IDX = $806B ; - floppy
|
|
!addr RD_CMDFN_IDX = $806C ; - ram disk
|
|
|
|
!addr XX_STATUS_IDX = $806D ; index byte for reading status
|
|
!addr SD_STATUS_IDX = $806D ; - SD card
|
|
!addr FD_STATUS_IDX = $806E ; - floppy
|
|
!addr RD_STATUS_IDX = $806F ; - ram disk
|
|
|
|
; Various, most likely to be reworked
|
|
|
|
!addr SD_DESC = $8070 ; current file descriptor
|
|
!addr FD_DIRENT = $8071 ; directory entry to read, 0-15
|
|
|
|
!addr FD_LOADTRACK = $8072 ; current track for file loading
|
|
!addr FD_LOADSECTOR = $8073 ; current sector for file loading
|
|
|
|
!addr RD_STARTSEG = $8074 ; RAM disk start address, 2nd most significant byte (or $FF if no RAM)
|
|
!addr RD_MAXTRACK = $8075 ; maximum RAM disk track number
|
|
|
|
|
|
; XXX Free space
|
|
|
|
|
|
;
|
|
; Various buffers, caches, and other large memory chunks
|
|
;
|
|
|
|
|
|
; General purpose buffers, 512 bytes each, each starts at page start - XXX dynamic alllocation to be written
|
|
|
|
!addr SHARED_BUF_0 = $8200 ; XXX temporarily hardcoded for usage by SD card
|
|
!addr SHARED_BUF_1 = $8400 ; XXX temporarily hardcoded for usage by floppy
|
|
!addr SHARED_BUF_2 = $8600
|
|
!addr SHARED_BUF_3 = $8800
|
|
!addr SHARED_BUF_4 = $8A00
|
|
!addr SHARED_BUF_5 = $8C00
|
|
!addr SHARED_BUF_6 = $8E00
|
|
!addr SHARED_BUF_7 = $9000
|
|
!addr SHARED_BUF_8 = $9200
|
|
!addr SHARED_BUF_9 = $9400
|
|
!addr SHARED_BUF_A = $9600
|
|
!addr SHARED_BUF_B = $9800
|
|
!addr SHARED_BUF_C = $9A00
|
|
!addr SHARED_BUF_D = $9C00
|
|
!addr SHARED_BUF_E = $9E00
|
|
!addr SHARED_BUF_F = $A000
|
|
|
|
; BAM cache for floppy drives; 2 KB (4 blocks) each, to cover up to ED floppies
|
|
|
|
!addr FD_BAM_CACHE_0 = $A200 ; - floppy disk 0 BAM
|
|
!addr SHARED_BUF_X0 = $A400 ; - buffer which can be used if disk is not ED
|
|
!addr FD_BAM_CACHE_1 = $A600 ; - floppy disk 1 BAM
|
|
!addr SHARED_BUF_X1 = $A800 ; - buffer which can be used if disk is not ED
|
|
|
|
; Memory shadow, needed for SD card support
|
|
|
|
!addr SD_MEMSHADOW_BUF = $AA00 ; 256 byte buffer for preserving original memory content
|
|
|
|
; Command/filename buffers, 128 bytes each - XXX extend to 256 bytes (change implementation)
|
|
|
|
!addr SD_CMDFN_BUF = $AB00 ; - SD card
|
|
!addr FD_CMDFN_BUF = $AC00 ; - floppy
|
|
!addr RD_CMDFN_BUF = $AD00 ; - ram disk
|
|
|
|
; Directory entry buffers, in BASIC format, $30 bytes each
|
|
|
|
!addr XX_DIRENT_BUF = $AE00
|
|
!addr SD_DIRENT_BUF = $AE00 ; - SD card
|
|
!addr FD_DIRENT_BUF = $AE30 ; - floppy
|
|
!addr RD_DIRENT_BUF = $AE60 ; - ram disk
|
|
|
|
; Status buffers, content terminated by 0, $30 bytes each
|
|
|
|
!addr XX_STATUS_BUF = $AE90
|
|
!addr SD_STATUS_BUF = $AE90 ; - SD card
|
|
!addr FD_STATUS_BUF = $AEC0 ; - floppy
|
|
!addr RD_STATUS_BUF = $AEF0 ; - ram disk
|
|
|
|
; Shared buffer metadata tables, 18 bytes each
|
|
|
|
!addr BUFTAB_UNIT = $AF20 ; which unit the buffer is assigned to
|
|
!addr BUFTAB_DEV = $AF32 ; which device within the unit
|
|
!addr BUFTAB_TRACK = $AF44 ; which track (or other kind of handle)
|
|
!addr BUFTAB_SECTOR = $AF56 ; which sector is stored in the first half of the buffer
|
|
|
|
; Common DMA list, 15 bytes
|
|
|
|
!addr DMAJOB_LIST = $AF68
|
|
!addr DMAJOB_SRC_MB = DMAJOB_LIST+2
|
|
!addr DMAJOB_DST_MB = DMAJOB_LIST+4
|
|
!addr DMAJOB_SIZE = DMAJOB_LIST+7 ; keep $0200 here
|
|
!addr DMAJOB_SRC_ADDR = DMAJOB_LIST+9
|
|
!addr DMAJOB_DST_ADDR = DMAJOB_LIST+12
|
|
|
|
;
|
|
; Reserved 20 KB for floppy track buffers + some area still free
|
|
;
|
|
|
|
!addr XX_REMAINING = $AF87
|