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bios2.asm
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bios2.asm
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;===============================================================================
;
; bios2 code to go in the ROM2 page that can be called
;
;===============================================================================
DEVICE NOSLOT64K
PAGE 5
SLDOPT COMMENT WPMEM
include "zeta2.inc" ; common definitions
include "macros.inc"
include "vt.inc"
BIOSROM equ ROM2 ; which ROM page are we compiling
BIOSRAM equ RAM5
org PAGE3
logo db "BIOS2 ", __DATE__, " ", __TIME__, 0
; the works of the calling mechanism is in the share file router.asm
; but it wants a table of functions and a count supplied here
bios_functions
dw f_biosver ; 0
dw f_stacktest ; 1
dw f_error ; 2 interpret last_error
dw f_help ; 3 show command help
dw f_romcommand ; 4 ROM command
dw f_hexcommand ; 5 HEX command
dw f_waitcommand ; 6 WAIT command
dw f_copycommand ; 7 COPY command
dw f_debug ; 8 DEBG command
bios_count equ ($-bios_functions)/2
ram_test db 0
f_biosver ld a, 1
ld [ram_test], a
call stdio_str ; uses nothing
RED
db "\r\nBIOS2 loaded "
db __DATE__
db " "
db __TIME__
db 0
ld a, [ram_test]
or a
jr z, .fb1
call stdio_str
YELLOW
db " in RAM",0
.fb1 call stdio_str
WHITE
db 0
jp good_end
;-------------------------------------------------------------------------------
; test dump the stack
;-------------------------------------------------------------------------------
f_stacktest
ld hl, [Z.cr_sp]
DUMPrr 0xff, hl, 32
scf
ret ; should go to return
;-------------------------------------------------------------------------------
; HEX command
;-------------------------------------------------------------------------------
f_hexcommand
ld ix, [Z.def_address] ; default value
ld bc, [Z.def_address+2] ; !! not ld c,(...) which compiles
call gethex32 ; in BC:IX
jp nc, err_badaddress ; value syntax
ld [Z.def_address], ix
ld [Z.def_address+2], bc
push hl ; preserve command string stuff
call stdio_str
db "\r\nhex: ",0
ld hl, ix
call stdio_32bit ; output BC:HL
call stdio_str
db " decimal: ",0
call stdio_decimal32 ; BC:HL again
pop hl
call skip ; more data on line?
jp z, good_end ; none so ok
call stdio_str
db " delimited by: ",0
dec e ; unget
.ch1 call getc ; echo
jp nc, good_end ; end of buffer
call stdio_putc
jr .ch1
;-------------------------------------------------------------------------------
; WAIT command
;-------------------------------------------------------------------------------
f_waitcommand
in a, (SWITCHES)
if LIGHTS_EXIST
ld b, a
bit 6, b
jr z, .fw1
ld a, 0xff ; trigger the led strobe
ld [led_countdown], a ; running on the interrupts
.fw1 ld a, b
endif
bit 7, a
jr nz, f_waitcommand
scf
ret
;-------------------------------------------------------------------------------
; COPY command destination20 source 20 count16
;-------------------------------------------------------------------------------
f_copycommand
ld ix, 0 ; default value
ld bc, 0
call gethex32 ; in BC:IX
ld [.source], ix
ld a, c
ld [.source+2], a
ld ix, 0 ; default value
ld bc, 0
call gethex32 ; in BC:IX
ld [.dest], ix
ld a, c
ld [.dest+2], a
ld ix, 0 ; default value
call gethexW ; in IX
ld [.count], ix
ld hl, [.source]
ld a, [.source+2]
ld c, a
ld de, [.dest]
ld a, [.dest+2]
ld b, a
ld ix, [.count]
call bank_ldir ; copy from C:HL to B:DE for IX counts
jr nc, .cc1
scf
ret
.cc1 or a
ret
; local variables
.source d24 0
.dest d24 0
.count dw 0
;-------------------------------------------------------------------------------
; copied from bios.asm - probably need thinking about
;-------------------------------------------------------------------------------
err_outofrange
ld a, ERR_OUTOFRANGE
cmd_err ld [Z.last_error], a
jp bad_end
err_runout
ld a, ERR_RUNOUT
jr cmd_err
err_unknownaction
ld a, ERR_UNKNOWNACTION
jr cmd_err
err_badaddress
ld a, ERR_BAD_ADDRESS
jr cmd_err
;-------------------------------------------------------------------------------
; DEBG command
;-------------------------------------------------------------------------------
f_debug call stdio_str
RED
db "\r\nDebug module loaded"
WHITE
db 0
xor a
out (LIGHTS), a
ld a, 0xa0
ex af, af'
ld a, 0xaf
ex af, af
ld bc, 0xbcb0
ld de, 0xded0
ld hl, 0x1234
exx
ld bc, 0xcbcf
ld de, 0xedef
ld hl, 0x4321
exx
ld ix, 0x2345
ld iy, 0x3456
nop
nop
nop
call debugSetup ; enter debug control mode
nop
nop
ld a, 0x55
out (LIGHTS), a
nop
nop
rst 0x28
nop
nop
xor a
inc a
inc a
inc a
inc a
ld ix, 1234 ; 4 byte instruction
inc a
.back inc a
inc a
inc a
inc a
inc a
SNAPT "loop"
inc a
inc a
inc a
inc a
inc a
inc a
in a, (SWITCHES)
and 0x80
jr nz, .back
jp good_end
if SHOW_MODULE
DISPLAY "bios2 size: ", /D, $-logo
endif