Make NS.CLOCK.SYSTEM chain using I/O. Fix Cricket
This commit is contained in:
Joshua Bell
parent
7af95f7162
commit
9dc6a7a149
145
cricket.system.s
145
cricket.system.s
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@ -20,11 +20,8 @@
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;;; ------------------------------------------------------------
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data_buffer = $1800
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read_delay_hi = $3 * 3 ; ($300 iterations is normal * 3.6MHz)
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.define SYSTEM_SUFFIX ".SYSTEM"
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.define PRODUCT "Cricket Clock"
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;;; ------------------------------------------------------------
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@ -45,10 +42,10 @@
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;;; file can be loaded/run at $2000.
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.proc relocate
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src := SYS_ADDR
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src := reloc_start
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dst := dst_addr
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ldx #(sys_end - sys_start + $FF) / $100 ; pages
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ldx #(reloc_end - reloc_start + $FF) / $100 ; pages
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ldy #0
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load: lda src,y ; self-modified
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load_hi := *-1
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@ -67,8 +64,7 @@ load: lda src,y ; self-modified
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;;; ============================================================
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;;; Start of relocated code
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sys_start:
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reloc_start := *
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pushorg dst_addr
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;;; ============================================================
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@ -377,6 +373,70 @@ suffix:
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found_self_flag:
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.byte 0
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;;; ============================================================
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;;; Common Routines
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;;; ============================================================
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;;; ------------------------------------------------------------
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;;; Output a high-ascii, null-terminated string.
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;;; String immediately follows the JSR.
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.proc zstrout
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ptr := $A5
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pla ; read address from stack
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sta ptr
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pla
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sta ptr+1
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bne skip ; always (since data not on ZP)
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next: cmp #HI('a') ; lower-case?
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bcc :+
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and lowercase_mask ; make upper-case if needed
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: jsr COUT
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skip: inc ptr
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bne :+
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inc ptr+1
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: ldy #0
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lda (ptr),y
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bne next
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lda ptr+1 ; restore address to stack
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pha
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lda ptr
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pha
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rts
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.endproc
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lowercase_mask:
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.byte $FF ; Set to $DF on systems w/o lower-case
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;;; ------------------------------------------------------------
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;;; COUT a 2-digit number in A
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.proc cout_number
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ldx #HI('0')
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cmp #10 ; >= 10?
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bcc tens
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;; divide by 10, dividend(+'0') in x remainder in a
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: sbc #10
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inx
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cmp #10
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bcs :-
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tens: pha
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cpx #HI('0')
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beq units
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txa
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jsr COUT
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units: pla
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ora #HI('0')
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jsr COUT
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rts
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.endproc
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;;; ============================================================
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;;;
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@ -404,10 +464,6 @@ found_self_flag:
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lda #$95 ; Ctrl+U (quit 80 col firmware)
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jsr COUT
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;; Reset stack
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ldx #$FF
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txs
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;; Reset I/O
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sta CLR80VID
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sta CLRALTCHAR
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@ -635,70 +691,6 @@ loop: lda driver,y
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rts ; done!
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.endproc
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;;; ============================================================
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;;; Common Routines
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;;; ============================================================
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;;; ------------------------------------------------------------
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;;; Output a high-ascii, null-terminated string.
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;;; String immediately follows the JSR.
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.proc zstrout
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ptr := $A5
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pla ; read address from stack
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sta ptr
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pla
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sta ptr+1
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bne skip ; always (since data not on ZP)
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next: cmp #HI('a') ; lower-case?
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bcc :+
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and lowercase_mask ; make upper-case if needed
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: jsr COUT
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skip: inc ptr
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bne :+
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inc ptr+1
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: ldy #0
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lda (ptr),y
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bne next
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lda ptr+1 ; restore address to stack
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pha
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lda ptr
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pha
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rts
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.endproc
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lowercase_mask:
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.byte $FF ; Set to $DF on systems w/o lower-case
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;;; ------------------------------------------------------------
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;;; COUT a 2-digit number in A
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.proc cout_number
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ldx #HI('0')
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cmp #10 ; >= 10?
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bcc tens
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;; divide by 10, dividend(+'0') in x remainder in a
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: sbc #10
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inx
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cmp #10
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bcs :-
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tens: pha
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cpx #HI('0')
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beq units
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txa
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jsr COUT
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units: pla
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ora #HI('0')
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jsr COUT
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rts
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.endproc
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;;; ============================================================
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;;; Cricket Clock Driver - copied into ProDOS
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;;; ============================================================
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@ -796,5 +788,6 @@ done: pla ; restore saved command state
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;;; ============================================================
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;;; End of relocated code
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poporg
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sys_end:
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reloc_end := *
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@ -3,7 +3,7 @@
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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/inexorabletash/cricket
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;;; https://github.com/a2stuff/cricket
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.setcpu "6502"
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.linecont +
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@ -19,22 +19,17 @@
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;;; ------------------------------------------------------------
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data_buffer = $1800
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.define SYSTEM_SUFFIX ".SYSTEM"
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.define PRODUCT "No-Slot Clock"
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;;; ------------------------------------------------------------
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.org $1000
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;; Loaded at $2000 but relocates to $1000
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;; SYS files load at $2000; relocates self to $1000
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.org SYS_ADDR
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dst_addr := $1000
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;;; ------------------------------------------------------------
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sys_start:
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sec
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bcs relocate
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jmp relocate
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.byte MM, DD, YY ; version date stamp
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@ -44,10 +39,10 @@ sys_start:
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;;; file can be loaded/run at $2000.
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.proc relocate
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src := SYS_ADDR
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dst := $1000
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src := reloc_start
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dst := dst_addr
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ldx #(sys_end - sys_start + $FF) / $100 ; pages
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ldx #(reloc_end - reloc_start + $FF) / $100 ; pages
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ldy #0
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load: lda src,y ; self-modified
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load_hi := *-1
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@ -58,57 +53,406 @@ load: lda src,y ; self-modified
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inc load_hi
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inc store_hi
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dex
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beq find_self_name ; done
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jmp load
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bne load
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jmp main
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.endproc
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;;; ------------------------------------------------------------
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;;; Identify the name of this SYS file, which should be present at
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;;; $280 with or without a path prefix. This is used when searching
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;;; for the next .SYSTEM file to execute.
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;;; ============================================================
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;;; Start of relocated code
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.proc find_self_name
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;; Search pathname buffer backwards for '/', then
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;; copy name into |self_name|; this is used later
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;; to find/invoke the next .SYSTEM file.
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reloc_start := *
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pushorg dst_addr
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;;; ============================================================
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;;; Main routine
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;;; ============================================================
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.proc main
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jsr setup
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jsr maybe_install_driver
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jsr launch_next
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brk
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.endproc
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;;; ============================================================
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;;; Preserve state needed to chain to next file
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;;; ============================================================
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.proc setup
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;; --------------------------------------------------
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;; Save most recent device for later, when chaining
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;; to next .SYSTEM file.
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lda DEVNUM
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sta devnum
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;; --------------------------------------------------
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;; Identify the name of this SYS file, which should be present at
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;; $280 with or without a path prefix. Search pathname buffer
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;; backwards for '/', then copy name into |self_name|.
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;; Find '/' (which may not be present, prefix is optional)
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lda #0
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sta $A8
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ldx PATHNAME
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beq pre_install
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floop: inc $A8
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beq no_name
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ldy #0 ; Y = length
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: lda PATHNAME,x
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and #$7f ; ignore high bit
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cmp #'/'
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beq copy_name
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iny
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dex
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beq @copy
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lda PATHNAME,x
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eor #'/'
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asl a
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bne floop
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bne :-
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;; Copy name into |self_name| buffer
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@copy: ldy #0
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cloop: iny
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inx
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lda PATHNAME,x
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sta self_name,y
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cpy $A8
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bcc cloop
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copy_name:
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cpy #0
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beq no_name
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sty self_name
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ldx PATHNAME
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: lda PATHNAME,x
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sta self_name,y
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dex
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dey
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bne :-
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;; Done
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rts
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no_name:
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lda #0
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sta self_name
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rts
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.endproc
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devnum: .byte 0
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self_name: .res 16
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;;; ============================================================
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;;; Find and invoke the next .SYSTEM file
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;;; ============================================================
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.proc quit
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MLI_CALL QUIT, quit_params
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brk ; crash if QUIT fails
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DEFINE_QUIT_PARAMS quit_params
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.endproc
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online_buf := $1C00
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io_buf := $1C00
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dir_buf := $2000
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block_len = $200
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DEFINE_ON_LINE_PARAMS on_line_params,,online_buf
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DEFINE_OPEN_PARAMS open_params, PATHNAME, io_buf
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DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
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DEFINE_READ_PARAMS read_block_params, dir_buf, block_len
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DEFINE_CLOSE_PARAMS close_params
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.proc launch_next
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;; Update reset vector - now terminates.
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lda #<quit
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sta $03F2
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lda #>quit
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sta $03F3
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eor #$A5
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sta $03F4
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;; Read directory and look for .SYSTEM files; find this
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;; one, and invoke the following one.
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ptr := $A5
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num := $A7
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len := $A8
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;; --------------------------------------------------
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;; Own name found? If not, just quit
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lda self_name
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beq quit
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;; --------------------------------------------------
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;; Find name of boot device, copy into PATHNAME
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lda devnum
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sta on_line_params::unit_num
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MLI_CALL ON_LINE, on_line_params
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bcc :+
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jmp on_error
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: lda #'/' ; Prefix by '/'
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sta PATHNAME+1
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lda online_buf
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and #$0F ; Mask off length
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sta PATHNAME
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ldx #0 ; Copy name
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: lda online_buf+1,x
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sta PATHNAME+2,x
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inx
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cpx PATHNAME
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bne :-
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inx ; One more for '/' prefix
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stx PATHNAME
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;; Open directory
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MLI_CALL OPEN, open_params
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bcc :+
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jmp on_error
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: lda open_params::ref_num
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sta read_block_params::ref_num
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sta close_params::ref_num
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;; Read first "block"
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MLI_CALL READ, read_block_params
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bcc :+
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jmp on_error
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;; Get sizes out of header
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: lda dir_buf + VolumeDirectoryHeader::entry_length
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sta entry_length_mod
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lda dir_buf + VolumeDirectoryHeader::entries_per_block
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sta entries_per_block_mod
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lda #1
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sta num
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;; Set up pointers to entry
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lda #<(dir_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr
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lda #>(dir_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr+1
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;; Process directory entry
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entry: ldy #FileEntry::file_type ; file_type
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lda (ptr),y
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cmp #$FF ; type=SYS
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bne next
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ldy #FileEntry::storage_type_name_length
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lda (ptr),y
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and #$30 ; regular file (not directory, pascal)
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beq next
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lda (ptr),y
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and #$0F ; name_length
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sta len
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tay
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;; Compare suffix - is it .SYSTEM?
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ldx suffix
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: lda (ptr),y
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cmp suffix,x
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bne next
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dey
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dex
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bne :-
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;; Yes; is it *this* .SYSTEM file?
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ldy self_name
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cpy len
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bne handle_sys_file
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: lda (ptr),y
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cmp self_name,y
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bne handle_sys_file
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dey
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bne :-
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sec
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ror found_self_flag
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;; Move to the next entry
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next: lda ptr
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clc
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adc #$27 ; self-modified: entry_length
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entry_length_mod := *-1
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sta ptr
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bcc :+
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inc ptr+1
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: inc num
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lda num
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cmp #$0D ; self-modified: entries_per_block
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entries_per_block_mod := *-1
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bcc entry
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;; Read next "block"
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MLI_CALL READ, read_block_params
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bcs not_found
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;; Set up pointers to entry
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lda #0
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sta num
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lda #<(dir_buf + $04)
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sta ptr
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lda #>(dir_buf + $04)
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sta ptr+1
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jmp entry
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;; --------------------------------------------------
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;; Found a .SYSTEM file which is not this one; invoke
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;; it if follows this one.
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handle_sys_file:
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bit found_self_flag
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bpl next
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MLI_CALL CLOSE, close_params
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;; Compose the path to invoke.
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ldx PATHNAME
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inx
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lda #'/'
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sta PATHNAME,x
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ldy #0
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: iny
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inx
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lda (ptr),y
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sta PATHNAME,x
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cpy len
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bcc :-
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stx PATHNAME
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jmp invoke_system_file
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not_found:
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jsr zstrout
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scrcode "\r\r* Unable to find next '.SYSTEM' file *\r"
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.byte 0
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bit KBDSTRB
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: lda KBD
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bpl :-
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bit KBDSTRB
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jmp quit
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.endproc
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;; Fall through...
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;;; ------------------------------------------------------------
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;;; Load/execute the system file in PATHNAME
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.proc invoke_system_file
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MLI_CALL OPEN, open_params
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bcs on_error
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lda open_params::ref_num
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sta read_params::ref_num
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MLI_CALL READ, read_params
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bcs on_error
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MLI_CALL CLOSE, close_params
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bcs on_error
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jmp SYS_ADDR ; Invoke loaded SYSTEM file
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.endproc
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;;; ------------------------------------------------------------
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;;; Error handler - invoked if any ProDOS error occurs.
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.proc on_error
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pha
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jsr zstrout
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scrcode "\r\r* Disk Error $"
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.byte 0
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pla
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jsr PRBYTE
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jsr zstrout
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scrcode " *\r"
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.byte 0
|
||||
|
||||
bit KBDSTRB
|
||||
: lda KBD
|
||||
bpl :-
|
||||
bit KBDSTRB
|
||||
jmp quit
|
||||
.endproc
|
||||
|
||||
;;; ============================================================
|
||||
;;; Data
|
||||
|
||||
suffix:
|
||||
PASCAL_STRING ".SYSTEM"
|
||||
|
||||
found_self_flag:
|
||||
.byte 0
|
||||
|
||||
;;; ============================================================
|
||||
;;; Common Routines
|
||||
;;; ============================================================
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; Output a high-ascii, null-terminated string.
|
||||
;;; String immediately follows the JSR.
|
||||
|
||||
.proc zstrout
|
||||
ptr := $A5
|
||||
|
||||
pla ; read address from stack
|
||||
sta ptr
|
||||
pla
|
||||
sta ptr+1
|
||||
bne skip ; always (since data not on ZP)
|
||||
|
||||
next: cmp #HI('a') ; lower-case?
|
||||
bcc :+
|
||||
and lowercase_mask ; make upper-case if needed
|
||||
: jsr COUT
|
||||
skip: inc ptr
|
||||
bne :+
|
||||
inc ptr+1
|
||||
: ldy #0
|
||||
lda (ptr),y
|
||||
bne next
|
||||
|
||||
lda ptr+1 ; restore address to stack
|
||||
pha
|
||||
lda ptr
|
||||
pha
|
||||
rts
|
||||
.endproc
|
||||
|
||||
lowercase_mask:
|
||||
.byte $FF ; Set to $DF on systems w/o lower-case
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; COUT a 2-digit number in A
|
||||
|
||||
.proc cout_number
|
||||
ldx #HI('0')
|
||||
cmp #10 ; >= 10?
|
||||
bcc tens
|
||||
|
||||
;; divide by 10, dividend(+'0') in x remainder in a
|
||||
: sbc #10
|
||||
inx
|
||||
cmp #10
|
||||
bcs :-
|
||||
|
||||
tens: pha
|
||||
cpx #HI('0')
|
||||
beq units
|
||||
txa
|
||||
jsr COUT
|
||||
|
||||
units: pla
|
||||
ora #HI('0')
|
||||
jsr COUT
|
||||
rts
|
||||
.endproc
|
||||
|
||||
|
||||
;;; ============================================================
|
||||
;;;
|
||||
;;; Driver Installer
|
||||
;;;
|
||||
;;; ============================================================
|
||||
|
||||
;;; ============================================================
|
||||
;;; Before installing, get the system to a known state and
|
||||
;;; ensure there is not a previous clock driver installed.
|
||||
|
||||
.proc pre_install
|
||||
.proc maybe_install_driver
|
||||
cld
|
||||
bit ROMIN2
|
||||
|
||||
;; Update reset vector - re-invokes this code.
|
||||
lda #<pre_install
|
||||
lda #<maybe_install_driver
|
||||
sta $03F2
|
||||
lda #>pre_install
|
||||
lda #>maybe_install_driver
|
||||
sta $03F3
|
||||
eor #$A5
|
||||
sta $03F4
|
||||
|
|
@ -117,10 +461,6 @@ cloop: iny
|
|||
lda #$95 ; Ctrl+U (quit 80 col firmware)
|
||||
jsr COUT
|
||||
|
||||
;; Reset stack
|
||||
ldx #$FF
|
||||
txs
|
||||
|
||||
;; Reset I/O
|
||||
sta CLR80VID
|
||||
sta CLRALTCHAR
|
||||
|
|
@ -149,8 +489,7 @@ cloop: iny
|
|||
and #$01 ; existing clock card?
|
||||
beq detect_nsc ; nope, check for NSC
|
||||
|
||||
;; Chain with no message
|
||||
jmp launch_next_sys_file
|
||||
rts ; yes, done!
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
|
|
@ -245,7 +584,7 @@ not_found:
|
|||
scrcode "\r\r\r", PRODUCT, " - Not Found."
|
||||
.byte 0
|
||||
|
||||
jmp launch_next_sys_file
|
||||
rts
|
||||
|
||||
saved: .byte 0, 0, 0, 0
|
||||
tries: .byte 3
|
||||
|
|
@ -322,317 +661,13 @@ loop: lda driver,y
|
|||
pla ; year
|
||||
jsr cout_number
|
||||
jsr CROUT
|
||||
|
||||
rts ; done!
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; Find and invoke the next .SYSTEM file
|
||||
|
||||
.proc launch_next_sys_file
|
||||
;; Update reset vector - now terminates.
|
||||
lda #<quit
|
||||
sta $03F2
|
||||
lda #>quit
|
||||
sta $03F3
|
||||
eor #$A5
|
||||
sta $03F4
|
||||
|
||||
ptr := $A5
|
||||
num := $A7
|
||||
len := $A8
|
||||
|
||||
lda DEVNUM ; stick with most recent device
|
||||
sta read_block_params_unit_num
|
||||
jsr read_block
|
||||
|
||||
lda data_buffer + VolumeDirectoryHeader::entry_length
|
||||
sta entry_length_mod
|
||||
lda data_buffer + VolumeDirectoryHeader::entries_per_block
|
||||
sta entries_per_block_mod
|
||||
lda #1
|
||||
sta num
|
||||
|
||||
lda #<(data_buffer + .sizeof(VolumeDirectoryHeader))
|
||||
sta ptr
|
||||
lda #>(data_buffer + .sizeof(VolumeDirectoryHeader))
|
||||
sta ptr+1
|
||||
|
||||
;; Process directory entry
|
||||
entry: ldy #FileEntry::file_type ; file_type
|
||||
lda (ptr),y
|
||||
cmp #$FF ; type=SYS
|
||||
bne next
|
||||
ldy #FileEntry::storage_type_name_length
|
||||
lda (ptr),y
|
||||
and #$30 ; regular file (not directory, pascal)
|
||||
beq next
|
||||
lda (ptr),y
|
||||
and #$0F ; name_length
|
||||
sta len
|
||||
tay
|
||||
|
||||
;; Compare suffix - is it .SYSTEM?
|
||||
ldx #.strlen(SYSTEM_SUFFIX)-1
|
||||
: lda (ptr),y
|
||||
cmp suffix,x
|
||||
bne next
|
||||
dey
|
||||
dex
|
||||
bpl :-
|
||||
|
||||
;; Yes; is it *this* .SYSTEM file?
|
||||
ldy self_name
|
||||
cpy len
|
||||
bne handle_sys_file
|
||||
: lda (ptr),y
|
||||
cmp self_name,y
|
||||
bne handle_sys_file
|
||||
dey
|
||||
bne :-
|
||||
sec
|
||||
ror found_self_flag
|
||||
|
||||
;; Move to the next entry
|
||||
next: lda ptr
|
||||
clc
|
||||
adc #$27 ; self-modified: entry_length
|
||||
entry_length_mod := *-1
|
||||
sta ptr
|
||||
bcc :+
|
||||
inc ptr+1
|
||||
: inc num
|
||||
lda num
|
||||
cmp #$0D ; self-modified: entries_per_block
|
||||
entries_per_block_mod := *-1
|
||||
bcc entry
|
||||
|
||||
lda data_buffer + VolumeDirectoryHeader::next_block
|
||||
sta read_block_params_block_num
|
||||
lda data_buffer + VolumeDirectoryHeader::next_block + 1
|
||||
sta read_block_params_block_num+1
|
||||
ora read_block_params_block_num
|
||||
beq not_found ; last block has next=0
|
||||
jsr read_block
|
||||
lda #0
|
||||
sta num
|
||||
lda #<(data_buffer + $04)
|
||||
sta ptr
|
||||
lda #>(data_buffer + $04)
|
||||
sta ptr+1
|
||||
jmp entry
|
||||
|
||||
;; Found a .SYSTEM file which is not this one; invoke
|
||||
;; it if follows this one.
|
||||
handle_sys_file:
|
||||
bit found_self_flag
|
||||
bpl next
|
||||
|
||||
;; Compose the path to invoke. First walk self path
|
||||
;; backwards to '/'.
|
||||
ldx PATHNAME
|
||||
beq append
|
||||
: dex
|
||||
beq append
|
||||
lda PATHNAME,x
|
||||
eor #'/'
|
||||
asl a
|
||||
bne :-
|
||||
|
||||
;; Now append name of found file.
|
||||
append: ldy #0
|
||||
: iny
|
||||
inx
|
||||
lda (ptr),y
|
||||
sta PATHNAME,x
|
||||
cpy len
|
||||
bcc :-
|
||||
stx PATHNAME
|
||||
jmp invoke_system_file
|
||||
|
||||
not_found:
|
||||
jsr zstrout
|
||||
scrcode "\r\r\r* Unable to find next '.SYSTEM' file *\r"
|
||||
.byte 0
|
||||
|
||||
bit KBDSTRB
|
||||
: lda KBD
|
||||
bpl :-
|
||||
bit KBDSTRB
|
||||
jmp quit
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; Output a high-ascii, null-terminated string.
|
||||
;;; String immediately follows the JSR.
|
||||
|
||||
.proc zstrout
|
||||
ptr := $A5
|
||||
|
||||
pla ; read address from stack
|
||||
sta ptr
|
||||
pla
|
||||
sta ptr+1
|
||||
bne skip ; always (since data not on ZP)
|
||||
|
||||
next: cmp #HI('a') ; lower-case?
|
||||
bcc :+
|
||||
and lowercase_mask ; make upper-case if needed
|
||||
: jsr COUT
|
||||
skip: inc ptr
|
||||
bne :+
|
||||
inc ptr+1
|
||||
: ldy #0
|
||||
lda (ptr),y
|
||||
bne next
|
||||
|
||||
lda ptr+1 ; restore address to stack
|
||||
pha
|
||||
lda ptr
|
||||
pha
|
||||
rts
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; COUT a 2-digit number in A
|
||||
|
||||
.proc cout_number
|
||||
ldx #HI('0')
|
||||
cmp #10 ; >= 10?
|
||||
bcc tens
|
||||
|
||||
;; divide by 10, dividend(+'0') in x remainder in a
|
||||
: sbc #10
|
||||
inx
|
||||
cmp #10
|
||||
bcs :-
|
||||
|
||||
tens: pha
|
||||
cpx #HI('0')
|
||||
beq units
|
||||
txa
|
||||
jsr COUT
|
||||
|
||||
units: pla
|
||||
ora #HI('0')
|
||||
jsr COUT
|
||||
rts
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
|
||||
lowercase_mask:
|
||||
.byte $FF ; Set to $DF on systems w/o lower-case
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; Invoke ProDOS QUIT routine.
|
||||
|
||||
.proc quit
|
||||
MLI_CALL QUIT, quit_params
|
||||
.byte 0 ; crash if QUIT fails
|
||||
rts
|
||||
.proc quit_params
|
||||
.byte 4 ; param_count
|
||||
.byte 0 ; quit_type
|
||||
.word 0000 ; reserved
|
||||
.byte 0 ; reserved
|
||||
.word 0000 ; reserved
|
||||
.endproc
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; Read a disk block.
|
||||
|
||||
.proc read_block
|
||||
MLI_CALL READ_BLOCK, read_block_params
|
||||
bcs on_error
|
||||
rts
|
||||
.endproc
|
||||
|
||||
.proc read_block_params
|
||||
.byte 3 ; param_count
|
||||
unit_num: .byte $60 ; unit_num
|
||||
.addr data_buffer ; data_buffer
|
||||
block_num: .word 2 ; block_num - block 2 is volume directory
|
||||
.endproc
|
||||
read_block_params_unit_num := read_block_params::unit_num
|
||||
read_block_params_block_num := read_block_params::block_num
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; Load/execute the system file in PATHNAME
|
||||
|
||||
.proc invoke_system_file
|
||||
MLI_CALL OPEN, open_params
|
||||
bcs on_error
|
||||
|
||||
lda open_params_ref_num
|
||||
sta read_params_ref_num
|
||||
|
||||
MLI_CALL READ, read_params
|
||||
bcs on_error
|
||||
|
||||
MLI_CALL CLOSE, close_params
|
||||
bcs on_error
|
||||
|
||||
jmp SYS_ADDR ; Invoke loaded SYSTEM file
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; Error handler - invoked if any ProDOS error occurs.
|
||||
|
||||
.proc on_error
|
||||
pha
|
||||
jsr zstrout
|
||||
scrcode "\r\r\r** Disk Error $"
|
||||
.byte 0
|
||||
|
||||
pla
|
||||
jsr PRBYTE
|
||||
jsr zstrout
|
||||
scrcode " **\r"
|
||||
.byte 0
|
||||
|
||||
bit KBDSTRB
|
||||
: lda KBD
|
||||
bpl :-
|
||||
bit KBDSTRB
|
||||
jmp quit
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
|
||||
.proc open_params
|
||||
.byte 3 ; param_count
|
||||
.addr PATHNAME ; pathname
|
||||
.addr data_buffer ; io_buffer
|
||||
ref_num:.byte 1 ; ref_num
|
||||
.endproc
|
||||
open_params_ref_num := open_params::ref_num
|
||||
|
||||
.proc read_params
|
||||
.byte 4 ; param_count
|
||||
ref_num:.byte 1 ; ref_num
|
||||
.addr SYS_ADDR ; data_buffer
|
||||
.word MAX_DW ; request_count
|
||||
.word 0 ; trans_count
|
||||
.endproc
|
||||
read_params_ref_num := read_params::ref_num
|
||||
|
||||
.proc close_params
|
||||
.byte 1 ; param_count
|
||||
ref_num:.byte 0 ; ref_num
|
||||
.endproc
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
|
||||
found_self_flag:
|
||||
.byte 0
|
||||
|
||||
suffix: .byte SYSTEM_SUFFIX
|
||||
|
||||
self_name:
|
||||
PASCAL_STRING "NS.CLOCK.SYSTEM"
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
;;; ============================================================
|
||||
;;; NSC driver - modified as needed and copied into ProDOS
|
||||
;;; ============================================================
|
||||
|
||||
driver:
|
||||
php
|
||||
|
|
@ -724,7 +759,10 @@ unlock:
|
|||
|
||||
sizeof_driver := * - driver
|
||||
.assert sizeof_driver <= 125, error, "Clock code must be <= 125 bytes"
|
||||
|
||||
;;; ------------------------------------------------------------
|
||||
|
||||
sys_end:
|
||||
;;; ============================================================
|
||||
;;; End of relocated code
|
||||
|
||||
poporg
|
||||
reloc_end := *
|
||||
|
|
|
|||
Loading…
Reference in New Issue