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EQUs und Datendefinitionen für BIOS zur gefälligen Übernahme
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Bei Bedarf bitte die entsprechenden Teile übernehmen 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
page
;-------
; 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
page
;-------
; 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
page
;--------
; 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
page
;-------
; 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
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