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File List | 1985-05-15 | 2.5 KB | 80 lines |
- page ,132
- ;--------------------------
- ; This text is a partial listing of BIOS low memory
- ; see tech ref.
- ; Malcolm McCorquodale
- ;--------------------------
- data segment at 40h
- rs232_base dw 4 dup(?) ;addr of rs232 adapters.
- printer_base dw 4 dup(?) ;addr of printers
- equip_flag dw ? ;installed hardware
- mfg_test 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 w/i 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_shift equ 08h ;alt shift key depressed
- ctl_shift equ 04h ;ctl shift key depressed
- left_shift equ 02h ;left shift key depressed
- right_shift equ 01h ;right shift key depressed
-
- kb_flag_1 db ?
-
- ins_shift equ 80h ;insert state is depressed
- caps_shift equ 40h ;caps lock state is depressed
- num_shift equ 20h ;num lock state is depressed
- scroll_shift equ 10h ;scroll lock state is depressed
- hold_state equ 08h ;suspend key has been toggled
-
- alt_input db ? ;storage for alternate keypad entry
- buffer_head dw ? ;ptr 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
- ;---------------------------------
- ; diskette data areas w/o equates
- ;---------------------------------
- seek_status db ?
- motor_status db ?
- motor_count db ?
- diskette_status db ?
- nec_status db 7 dup(?)
- ;----------------------------------
- ; 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
- data ends
-
- ;--------------------------------
- ; video diplay buffer
- ;--------------------------------
- video_ram segment at 0b800h
- regen label byte
- regenw label word
- video_ram ends
-
- ;--------------------------------
- ; Stack segment
- ;--------------------------------
- stack segment stack 'stack'
- stk db 32 dup (?)
- stack ends