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https://github.com/a2stuff/IIcSystemClock.git
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disasm wip
This commit is contained in:
Joshua Bell
parent
84e1b1e813
commit
5c74e7326c
@ -6,6 +6,10 @@
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.org $2000
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.setcpu "65C02"
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;;; TODO: Identify 4 different clock drivers.
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;;; * IIc System Clock
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.enum MessageCode
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kInstall = 0
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kNoSysFile = 1
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@ -519,51 +523,59 @@ patch_target:
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.proc Patch0
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acia_command_patch1 := * + 1
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;; ------------------------------
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;; Save COMMAND register
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lda PORT2_ACIA_COMMAND
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pha ; Save command register
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pha
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;; Poke COMMAND register
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ldy #3 ; tries
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ldx #22 ; delay
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;; ------------------------------
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;; Unlock COMMAND register
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ldy #3 ; cycles
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ldx #22 ; initial delay
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lda #%00001000
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command_loop:
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acia_command_patch2 := * + 1
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sta PORT2_ACIA_COMMAND
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: dex
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: dex ; wait
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bne :-
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eor #%00001010
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ldx #$09
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ldx #9 ; repeat delay
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dey
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bne command_loop
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;; ------------------------------
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;; Read bit out of STATUS register
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;; 1 bit at a time in blocks of 4, giving
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;; "MMDDhhmm" in high nibble of each byte
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ldy #$04
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bne L2289
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L2284:
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ldy #4
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bne read ; always
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read_loop:
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delay_patch1 := * + 1
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lda #kDefaultDelay
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: dec ; 65C02
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bne :-
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L2289:
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read:
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acia_status_patch1 := * + 1
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lda PORT2_ACIA_STATUS
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rol a ; shift out bit 5
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rol a
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rol a
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rol a
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ror $0200,x
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lsr $0201,x
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ror digits_buffer,x ; and into digits
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lsr digits_buffer+1,x
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dey
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bne L2284
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ldy #$04
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bne read_loop
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ldy #4 ; 4 bits per digit
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dex
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bpl L2284
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bpl read_loop
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pla ; Restore command register
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;; ------------------------------
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;; Restore COMMAND register
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pla
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acia_command_patch3 := * + 1
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sta PORT2_ACIA_COMMAND
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@ -577,7 +589,10 @@ acia_command_patch3 := * + 1
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;; ...Patch applied to here.
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;; --------------------------------------------------
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;; digits_buffer $200...$207 now has "MMDDhhmm", each digit as a byte
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;; digits_buffer $200...$207 now has "MMDDhhmm",
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;; each digit in the low (???) nibble of a separate byte (???)
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;; e.g. 1/1 01:01 would be ... ???
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;; e.g. 12/31 23:59 would be ... ???
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;; --------------------------------------------------
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;; Process fields (two digits/bytes at a time)
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@ -607,9 +622,10 @@ digit_loop:
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;; --------------------------------------------------
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;; Assign month in DATELO/DATEHI
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;; TODO: How do both digits of MM get processed ???
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;; TODO: Why does this process digits_buffer and not
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;; digits_buffer + 1?
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L22BA: lda digits_buffer ; top nibble is month???
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L22BA: lda digits_buffer ; top nibble is month ???
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asl a ; DATELO = mmmddddd
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and #%11100000
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ora DATELO
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@ -621,6 +637,7 @@ L22BA: lda digits_buffer ; top nibble is month???
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sta DATELO+1
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;; --------------------------------------------------
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;; ???
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ldy #$01
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: lda $0208,y
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ora #$B0
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@ -661,8 +678,8 @@ time_offset_table := * - 3
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Patches:
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;; --------------------------------------------------
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;; Patch #1
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;;; ============================================================
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;;; Patch 1:
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.proc Patch1
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firmware_byte := * + 1
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@ -687,8 +704,8 @@ L2303: sbc #$01
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bne L2303
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L2307: lda MOUSE_BTN
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rol a
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ror $0200,x
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lsr $0201,x
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ror digits_buffer,x
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lsr digits_buffer+1,x
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nop
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dey
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bne L2300
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@ -699,8 +716,8 @@ L2307: lda MOUSE_BTN
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.assert .sizeof(Patch1) = kPatchLength, error, "Patch length"
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Patch1_firmware_byte := Patch1::firmware_byte
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;; --------------------------------------------------
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;; Patch #2
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;;; ============================================================
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;;; Patch 2:
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.proc Patch2
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;; Prime the command
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@ -733,8 +750,8 @@ read_status:
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rol a
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rol a
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rol a
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ror $0200,x
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lsr $0201,x
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ror digits_buffer,x
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lsr digits_buffer+1,x
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dey
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bne read_loop
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ldy #$04
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@ -747,8 +764,8 @@ read_status:
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.assert .sizeof(Patch2) = kPatchLength, error, "Patch length"
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Patch2_delay := Patch2::delay
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;; --------------------------------------------------
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;; Patch #3
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;;; ============================================================
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;;; Patch 3:
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.proc Patch3
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lda ENVBL
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@ -766,8 +783,8 @@ L2364: dex
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L2369: ldy #$04
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L236B: lda MOUSE_BTN
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rol a
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ror $0200,x
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lsr $0201,x
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ror digits_buffer,x
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lsr digits_buffer+1,x
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sta X0EDGE2
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nop
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nop
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