294 lines
7.1 KiB
ArmAsm
294 lines
7.1 KiB
ArmAsm
;;; NS.CLOCK.SYSTEM
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;;; Original by "CAP" 04/21/91
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;;; http://www.apple2.org.za/gswv/a2zine/GS.WorldView/v1999/Oct/MISC/NSC.Disk.TXT
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;;; Modification history available at:
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;;; https://github.com/a2stuff/prodos-drivers
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.setcpu "6502"
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.linecont +
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.feature string_escapes
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.include "apple2.inc"
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.include "apple2.mac"
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.include "opcodes.inc"
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.include "../../inc/apple2.inc"
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.include "../../inc/macros.inc"
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.include "../../inc/prodos.inc"
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;;; ************************************************************
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.include "../../inc/driver_preamble.inc"
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;;; ************************************************************
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;;; ============================================================
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;;;
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;;; Driver Installer
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;;;
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;;; ============================================================
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.define PRODUCT "No-Slot Clock"
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;;; ============================================================
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;;; Ensure there is not a previous clock driver installed.
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.proc maybe_install_driver
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lda MACHID
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and #$01 ; existing clock card?
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beq detect_nsc ; nope, check for NSC
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rts ; yes, done!
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.endproc
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;;; ------------------------------------------------------------
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;;; Detect NSC. Scan slot ROMs and main ROMs. Try reading
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;;; each location several times, and validate results before
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;;; installing driver.
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.proc detect_nsc
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;; Preserve date/time
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ldy #3 ; copy 4 bytes
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: lda DATELO,y
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sta saved,y
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dey
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bpl :-
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;; Check slot ROMs
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lda #>$CFFF
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ldy #<$CFFF
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sta ld4+2
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sty ld4+1
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sta st4+2
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sty st4+1
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lda #0
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sta slot
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lda #3 ; treat slot 0 as slot 3
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sloop: ora #$C0 ; A=$Cs
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sta st1+2
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rloop: sta ld1+2
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sta ld2+2
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sta st2+2
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lda #3 ; 3 tries - need valid results each time
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sta tries
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try: jsr driver ; try reading date/time
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lda DATELO+1 ; check result
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ror a
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lda DATELO
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rol a
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rol a
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rol a
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rol a
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and #$0F
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beq next
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cmp #13 ; month
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bcs next
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lda DATELO
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and #$1F
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beq next
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cmp #32 ; day
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bcs next
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lda TIMELO+1
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cmp #24 ; hours
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bcs next
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lda TIMELO
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cmp #60 ; minutes
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bcs next
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dec tries
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bne try
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beq install_driver ; all tries look valid
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next: inc slot
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lda slot
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cmp #8
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bcc sloop ; next slot
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bne not_found
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;; Not found in slot ROM, try main ROMs ???
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lda #>$C015
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ldy #<$C015
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sta ld4+2
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sty ld4+1
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ldy #$07
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sta st1+2
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sty st1+1
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dey
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sta st4+2
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sty st4+1
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lda #>$C800
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bne rloop
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;; Restore date/time
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not_found:
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ldy #3
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: lda saved,y
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sta DATELO,y
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dey
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bpl :-
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;; Show failure message
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jsr log_message
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scrcode PRODUCT, " - Not Found."
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.byte 0
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rts
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saved: .byte 0, 0, 0, 0
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tries: .byte 3
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slot: .byte 0
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.endproc
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;;; ------------------------------------------------------------
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;;; Install NSC Driver. Copy into address at DATETIME vector,
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;;; update the vector and update MACHID bits to signal a clock
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;;; is present.
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.proc install_driver
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ptr := $A5
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;; Update absolute addresses within driver
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lda DATETIME+1
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sta ptr
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clc
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adc #(unlock - driver - 1)
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sta unlock_addr
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lda DATETIME+2
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sta ptr+1
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adc #0
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sta unlock_addr+1
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;; Copy driver into appropriate bank
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lda RWRAM1
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lda RWRAM1
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ldy #sizeof_driver-1
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loop: lda driver,y
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sta (ptr),y
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dey
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bpl loop
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;; Set the "Recognizable Clock Card" bit
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lda MACHID
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ora #$01
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sta MACHID
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lda #OPC_JMP_abs
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sta DATETIME
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;; Invoke the driver to init the time
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jsr DATETIME
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lda ROMIN2
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;; Display success message
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jsr log_message
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scrcode PRODUCT, " - "
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.byte 0
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;; Display the current date
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jsr cout_date
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rts ; done!
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.endproc
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;;; ============================================================
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;;; NSC driver - modified as needed and copied into ProDOS
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;;; ============================================================
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driver:
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php
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sei
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ld4: lda $CFFF ; self-modified
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pha
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st1: sta $C300 ; self-modified
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ld1: lda $C304 ; self-modified
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ldx #8
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;; Unlock the NSC by bit-banging.
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uloop:
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unlock_addr := *+1
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lda unlock-1,x ; self-modified
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sec
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ror a ; a bit at a time
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: pha
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lda #0
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rol a
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tay
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ld2: lda $C300,y ; self-modified
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pla
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lsr a
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bne :-
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dex
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bne uloop
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;; Read 8 bytes * 8 bits of clock data into $200...$207
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ldx #8
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bloop: ldy #8
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st2:
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: lda $C304 ; self-modified
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ror a
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ror $01FF,x
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dey
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bne :-
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lda $01FF,x ; got 8 bits
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lsr a ; BCD to binary
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lsr a ; shift out tens
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lsr a
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lsr a
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tay
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beq donebcd
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lda $01FF,x
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and #$0F ; mask out units
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clc
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: adc #10 ; and add tens as needed
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dey
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bne :-
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sta $01FF,x
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donebcd:
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dex
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bne bloop
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;; Now $200...$207 is y/m/d/w/H/M/S/f
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;; Update ProDOS date/time.
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lda $0204 ; hour
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sta TIMELO+1
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lda $0205 ; minute
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sta TIMELO
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lda $0201 ; month
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asl a
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asl a
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asl a
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asl a
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asl a
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ora $0202 ; day
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sta DATELO
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lda $0200 ; year
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rol a
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sta DATELO+1
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pla
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bmi done
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st4: sta $CFFF ; self-modified
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done: plp
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rts
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unlock:
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;; NSC unlock sequence
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.byte $5C, $A3, $3A, $C5
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.byte $5C, $A3, $3A, $C5
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.byte $00
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sizeof_driver := * - driver
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.assert sizeof_driver <= 125, error, "Clock code must be <= 125 bytes"
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;;; ************************************************************
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.include "../../inc/driver_postamble.inc"
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;;; ************************************************************
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