Apple-2-SW
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IIcSystemClock
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disasm wip

This commit is contained in:
Joshua Bell 2020-10-05 19:30:59 -07:00
parent beb71633b7
commit 3d0b4f7e0e
1 changed files with 48 additions and 17 deletions
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65
clock.system.s
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@ -31,10 +31,18 @@ has_80col := $09 ; 1 = has 80 column card
month := $0A ; month from current date
msg_num := $0B ; stashed message number
digits_buffer := $200 ; temporary usage during clock read
PRODOS_SYS_START := $2000
SLOT3_FIRMWARE := $C300
;;; SSC in Slot 1
PORT1_ACIA_STATUS := $C099
PORT1_ACIA_COMMAND := $C09A
PORT1_ACIA_CONTROL := $C09B
;;; SSC in Slot 2
PORT2_ACIA_STATUS := $C0A9
PORT2_ACIA_COMMAND := $C0AA
PORT2_ACIA_CONTROL := $C0AB
@ -264,14 +272,15 @@ tries: .byte 0
L2110: .byte 0
L2111: lda mach_type
bne L2135 ; not IIc
.proc L2111
lda mach_type
bne skip ; not IIc
lda L2110
bne L2135
bne skip
inc L2110
ldy #$99
ldy #<PORT1_ACIA_STATUS
sty acia_status_patch1
iny
iny ; <PORT1_ACIA_COMMAND
sty acia_command_patch1
sty acia_command_patch2
lda L11FE
@ -280,7 +289,7 @@ L2111: lda mach_type
sty acia_command_patch3
bne L20FE
L2135: ldy #MessageCode::kNoClock
skip: ldy #MessageCode::kNoClock
sty msg_num
lda MACHID ; Check for clock card
ror a
@ -296,6 +305,7 @@ no_clock:
sta TIMELO
sta TIMELO+1
jmp ShowMessageAndMaybeChain
.endproc
;; --------------------------------------------------
@ -551,27 +561,36 @@ acia_command_patch3 := * + 1
;; ...Patch applied to here.
;; --------------------------------------------------
;; Process digits
ldx #6
L22A3: lda $0201,x
;; digits_buffer $200...$207 now has "MMDDhhmm", each digit as a byte
: dec $0200,x ;
;; --------------------------------------------------
;; Process fields (two digits/bytes at a time)
ldx #6
digit_loop:
lda digits_buffer+1,x ; ones place
: dec digits_buffer,x ; tens place
bmi :+
clc
adc #10
bcc :-
:
;; A now holds binary value
offset_table_addr := * + 1
ldy time_offset_table,x ; Offset table
sta DEVNUM,y ; y is offset from DEVNUM for some reason
dex
dex
bne L22A3
bne digit_loop
;; Now TIMELO holds minutes, TIMEHI has hours,
;; DATELO has days. Months has not been processed.
;; --------------------------------------------------
;; Assign month in DATELO/DATEHI
L22BA: lda $0200 ; top nibble is month
L22BA: lda digits_buffer ; top nibble is month???
asl a ; DATELO = mmmddddd
and #%11100000
ora DATELO
@ -584,22 +603,34 @@ L22BA: lda $0200 ; top nibble is month
;; --------------------------------------------------
ldy #$01
L22CE: lda $0208,y
: lda $0208,y
ora #$B0
sta $020F,y
dey
bpl L22CE
bpl :-
dex
bne L22BA
plp
;; --------------------------------------------------
;; Exit driver
plp ; restore interrupt state
;; HACK: This RTS=$60 doubles as the first real entry in the
;; offset table.
.assert OPC_RTS = DATELO - DEVNUM, error, "Offset mismatch"
rts
;; Offset from MMDDhhmm digits to DATE/TIME fields in
;; ProDOS global page. Only the even entries are used
;; and months get special handling.
time_offset_table := * - 3
.byte $FF ; dummy
.byte TIMELO+1 - DEVNUM ; offset
.byte TIMELO+1 - DEVNUM ; offset to hours field
.byte $FF ; dummy
.byte TIMELO - DEVNUM ; offset
.byte TIMELO - DEVNUM ; offset to minutes field
;; End of relocated clock driver