Apple-2-SW/IIcSystemClock
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disasm tweaks/comments

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This commit is contained in:
Joshua Bell 2021-10-06 20:36:39 -07:00
parent 08990af793
commit f9d3511fb8
1 changed files with 19 additions and 14 deletions
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33
clock.system.s
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@ -199,7 +199,7 @@ loop:
lda file_info_params + GET_FILE_INFO_PARAMS::mod_date + 1
lsr a
sta year
sta year ; patch driver
jsr ConvertToBCD
sta bcd_year
@ -488,7 +488,7 @@ install_ptr := * + 1
and #$0F
clc
adc tmp
sta year
sta year ; patch driver
rts
.endproc
@ -649,6 +649,10 @@ acia_command_patch3 := * + 1
;; --------------------------------------------------
;; Process fields (two digits/bytes at a time)
;; 6 and 7 (minute) --> TIMELO
;; 4 and 5 (hour) --> TIMEHI
;; 2 and 3 (day) --> DATELO
ldx #6
digit_loop:
lda digits_buffer+1,x ; ones place
@ -662,8 +666,8 @@ digit_loop:
;; 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 RTS hack below
ldy time_offset_table,x
sta DATELO - OPC_RTS,y ; y is offset by $60 for RTS hack below
dex
dex
bne digit_loop
@ -674,22 +678,22 @@ digit_loop:
;; --------------------------------------------------
;; Assign month in DATELO/DATEHI
L22BA: lda digits_buffer ; top nibble is month
asl a ; DATELO = mmmddddd
and #%11100000
L22BA: lda digits_buffer ; top nibble is month (mmmm0000)
asl a ; C=MSB of month
and #%11100000 ; DATELO = mmmddddd
ora DATELO
sta DATELO
year := * + 1
year := * + 1 ; modified by installer
lda #(kDefaultYear .mod 100)
rol a ; DATEHI = yyyyyyym, shift in month bit
rol a ; DATEHI = yyyyyyym, shift in month MSB
sta DATELO+1
;; --------------------------------------------------
;; ???
;; Convert $207/$208 to ASCII digits at $20E/$02F (Why???)
ldy #$01
: lda $0208,y
ora #$B0
ora #$B0 ; '0'|$80
sta $020F,y
dey
bpl :-
@ -705,7 +709,8 @@ L22BA: lda digits_buffer ; top nibble is month
;; HACK: This RTS=$60 doubles as the first real entry in the
;; offset table.
.assert OPC_RTS = DATELO - DEVNUM, error, "Offset mismatch"
.assert OPC_RTS = $60, error, "Offset mismatch"
;;
rts
;; Offset from MMDDhhmm digits to DATE/TIME fields in
@ -715,9 +720,9 @@ L22BA: lda digits_buffer ; top nibble is month
time_offset_table := * - 3
.byte $FF ; dummy
.byte TIMELO+1 - DEVNUM ; offset to hours field
.byte TIMELO+1 - DATELO + OPC_RTS ; offset to hours field
.byte $FF ; dummy
.byte TIMELO - DEVNUM ; offset to minutes field
.byte TIMELO - DATELO + OPC_RTS ; offset to minutes field
;; End of relocated clock driver