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8086 Assembler:
EQUs und Datendefinitionen für BIOS zur gefälligen Übernahme

Dieser Abschnitt enthält eine Sammlung von EQUs und Datendefinitionen für BIOS

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Zur Verbesserung der Lesbarkeit ist die Programmauflistung maschinell in Kleinschrift umcodiert worden. Ich hoffe, es hat sich dabei kein Fehler eingeschlichen!

                subttl rom bios data areas and equates
; equates
port_a          equ     60h     ;8255 port a addr
port_b          equ     61h     ;8255 port b addr
port_c          equ     62h     ;8255 port c addr
cmd_port        equ     63h
inta00          equ     20h     ;8259 port
inta01          equ     21h     ;8259 port
eoi             equ     20h
timer           equ     40h
tim_ctl         equ     43h     ;8253 timer control port addr
timer0          equ     40h     ;8253 timer/cnter 0 port addr
tmint           equ     01      ;timer 0 intr recvd mask
dma08           equ     08      ;dma status reg port addr
dma             equ     00      ;dma channel 0 address reg port addr
max_period      equ     540h
min_period      equ     410h
kbd_in          equ     60h     ;keyboard data in addr port
kbdint          equ     02      ;keyboard intr mask
kb_data         equ     60h     ;keyboard scan code port
kb_ctl          equ     61h     ;control bits for keyboard sense data
; 8088 interrupt locations
abs0            segment at 0
stg_loc0        label   byte
                org     2*4
nmi_ptr         label   word
                org     5*4
ints_ptr        label   word
                org     8*4
int_addr        label   word
int_ptr         label   dword
                org     10h*4
video_int       label   word
                org     1dh*4
parm_ptr        label   dword   ;pointer to video parms
                org     01eh*4  ;interrupt 1eh
disk_ptr        label   dword
                org     01fh*4  ;location of pointer
ext_ptr         label   dword   ;pointer to extension
                org     7c00h
boot_locn       label   far
abs0            ends
; stack -- used during initialization only
stack           segment at 30h
                dw      128 dup(?)
tos             label   word
stack           ends
; rom bios data areas
data            segment at 40h
rs232_base      dw      4 dup(?) ;addresses of rs232 adapters
printer_base    dw      4 dup(?) ;addresses of printers
equip_flag      dw      ?       ;installed hardware
mfg_tst         db      ?       ;initialization flag
memory_size     dw      ?       ;memory size in k bytes
io_ram_size     dw      ?       ;memory in i/o channel
; keyboard data areas
kb_flag         db      ?
;------ shift flag equates within kb_flag
ins_state       equ     80h     ;insert state is active
caps_state      equ     40h     ;caps lock state has been toggled
num_state       equ     20h     ;num lock state has been toggled
scroll_state    equ     10h     ;scroll lock state has been toggled
alt_state       equ     08h     ;alternate shift key depressed
ctl_shift       equ     04h     ;control shift key depressed
left_shift      equ     02h     ;left shift key depressed
right_shift     equ     01h     ;right shift key depressed

kb_flag_1       db      ?       ;second byte of keyboard status
ins_shift       equ     80h     ;insert key is depressed
caps_shift      equ     40h     ;caps lock key is depressed_shift
num_lock        equ     20h     ;num lock key is depressed
scroll_shift    equ     10h     ;scroll lock key is depressed
hold_state      equ     08h     ;suspend key has been toggled

alt_input       db      ?       ;storage for alternate keypad entry
buffer_head     dw      ?       ;pointer to head of keyboard buffer
buffer_tail     dw      ?       ;pointer to tail of keyboard buffer
kb_buffer       dw      16 dup(?)       ;room for 15 entries
kb_buffer_end   label   word
;------ head = tail indicates that the buffer is empty
num_key         equ     69      ;scan code for number lock
scroll_key      equ     70      ;scroll lock key
alt_key         equ     56      ;alternate shift key scan code
ctl_key         equ     29      ;scan code for control key
caps_key        equ     58      ;scan code for shift lock
left_key        equ     42      ;scan code for left shift
right_key       equ     54      ;scan code for right shift
ins_key         equ     82      ;scan code for insert key
del_key         equ     83      ;scan code for delete key
; diskette data areas
seek_status     db      ?       ;drive recalibration status
; bit 3-0 = drive 3-0 needs recal before next seek if bit is = 0
int_flag        equ     080h    ;interrupt occurrence flag
motor_status    db      ?       ;motor status
; bit 3-0 = drive 3-0 is currently running
; bit 7   = current operation is a write, requires delay
motor_count     db      ?       ;time out counter for drive turn off
motor_wait      equ     37      ;two seconds of counts for motor turn off

diskette_status db      ?       ;single byte of return code info for status
time_out        equ     80h     ;attachment failed to respond
bad_seek        equ     40h     ;seek operation failed
bad_nec         equ     20h     ;nec controller has failed
bad_crc         equ     10h     ;bad crc on diskette read
dma_boundary    equ     09h     ;attempt to dma across 64k boundary
bad_dma         equ     08h     ;dma overrun on operation
record_not_fnd  equ     04h     ;requested sector not found
write_protect   equ     03h     ;write attempted on write prot disk
bad_addr_mark   equ     02h     ;address mark not found
bad_cmd         equ     01h     ;bad command passed to diskette i/o

nec_status      db      7 dup(?)        ;status bytes from nec
; video display data area
crt_mode        db      ?       ;current crt mode
crt_cols        dw      ?       ;number of columns on screen
crt_len         dw      ?       ;length of regen in bytes
crt_start       dw      ?       ;starting address in regen buffer
cursor_posn     dw      8 dup(?) ;cursor for each of up to 8 pages
cursor_mode     dw      ?       ;current cursor mode setting
active_page     db      ?       ;current page being displayed
addr_6845       dw      ?       ;base address for active display card
crt_mode_set    db      ?       ;current setting of the 3x8 register
crt_pallette    db      ?       ;current pallette setting color card
; cassette data area
edge_cnt        dw      ?       ;time count at data edge
crc_reg         dw      ?       ;crc register
last_val        db      ?       ;last input value
; timer data area
timer_low       dw      ?       ;low word of timer count
timer_high      dw      ?       ;high word of timer count
timer_ofl       db      ?       ;timer has rolled over since last read
;counts_sec     equ     18
;counts_min     equ     1092
;counts_hour    equ     65543
;counts_day     equ     1573040 = 1800b0h
; system data area
bios_break      db      ?       ;bit 7 = 1 if break key has been depressed
reset_flag      dw      ?       ;word = 1234h if keyboard reset underway
data            ends
; extra data area
xxdata          segment at 50h
status_byte     db      ?
xxdata          ends
; video display buffer
video_ram       segment at 0b800h
regen           label   byte
regenw          label   word
                db      16384 dup(?)
video_ram       ends

Letztes Upload: 13.10.2015 um 14:09:58