Apple-2-SW/davex-mg-utils
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detab setyear.s

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mgcaret 2017-11-03 09:18:37 -07:00
parent cdf2db65d3
commit 7372aad10e
1 changed files with 20 additions and 20 deletions
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40
setyear.s
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@ -17,7 +17,7 @@ tmp = xczpage
year = tmp+1
count = year+1
prbyte = $fdda
prbyte = $fdda
;cout = $fded
DX_start dx_mg_auto_origin ; load address
@ -43,29 +43,29 @@ prbyte = $fdda
bcs :+ ; not given, do it
rts
; see if we can patch the driver
: lda $c08b
lda $c08b
ldx #$03
: lda $d7b4,x ; tdays table, at september
cmp tdaysv,x ; that what ProDOS has?
bne setyterr ; not the thunderclock driver
: lda $c08b
lda $c08b
ldx #$03
: lda $d7b4,x ; tdays table, at september
cmp tdaysv,x ; that what ProDOS has?
bne setyterr ; not the thunderclock driver
dex
bpl :-
bpl :-
; go ahead and patch
ldx #6
: lda yeartab,x
sta $d7b8,x ; address of year table in P8
ldx #6
: lda yeartab,x
sta $d7b8,x ; address of year table in P8
dex
bpl :-
bit $c082 ; ROM back before exit
bpl :-
bit $c082 ; ROM back before exit
rts
setyterr: bit $c082 ; ROM back before death
lda #$01
jsr xredirect
jsr xmess
setyterr: bit $c082 ; ROM back before death
lda #$01
jsr xredirect
jsr xmess
asc_hi "Can't patch clock driver!"
.byte $00
jmp exiterr
jmp exiterr
badparms: lda #$01
jsr xredirect
jsr xmess
@ -149,7 +149,7 @@ dayidx: .byte 1,0,6,5,4,3,2 ; MonSunSatFriThuWedTue
; Table we will copy into ProDOS
yeartab: .res 7,$ff
; table to validate the P8 tclock driver, 4 bytes at $d7b4
tdaysv: .byte 242,20,51,81
tdaysv: .byte 242,20,51,81
; adapted from http://6502.org/source/misc/dow.htm
; inputs: y = year (0-255 = 1900-2155)
; x = month
@ -175,6 +175,6 @@ march: eor #$7f ; invert a so carry works right
mod7: adc #7 ; returns (a+3) modulo 7
bcc mod7 ; for a in 0..255
rts
mtab: .byte 1,5,6,3,1,5,3,0,4,2,6,4 ; month offsets
mtab: .byte 1,5,6,3,1,5,3,0,4,2,6,4 ; month offsets
.endproc
DX_end