2024-03-09 18:36:33 +00:00
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; Loader for DUKE
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.include "zp.inc"
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.include "hardware.inc"
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.include "common_defines.inc"
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nibtbl = $300 ; nothing uses the bottom 128 bytes of $300, do they?
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bit2tbl = $380 ; bit2tbl: .res 86 ; = nibtbl+128
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filbuf = $3D6 ; filbuf: .res 4 ; = bit2tbl+86
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; read any file slot 6 version
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; based on FASTLD6 and RTS copyright (c) Peter Ferrie 2011-2013,2018
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; modified to assembled with ca65 -- vmw
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; added code to patch it to run from current disk slot -- vmw
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; WHICH_LOAD = $7E ; thing to load
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; adrlo = $26 ; constant from boot prom
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; adrhi = $27 ; constant from boot prom
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; tmpsec = $3c ; constant from boot prom
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; reqsec = $3d ; constant from boot prom
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; sizelo = $44
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; sizehi = $45
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; secsize = $46
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; namlo = $f8
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; namhi = $f9
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; TEMPY = $fa
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; step = $fd ; state for stepper motor
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; tmptrk = $fe ; temporary copy of current track
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; phase = $ff ; current phase for /seek
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; OUTL = $fe ; for picking filename
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; OUTH = $ff
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dirbuf = $c00
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; note, don't put this immediately below
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; the value being read as destaddr-4
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; is temporarily overwritten during read
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; process
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FILENAME = $280
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;===================================================
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;===================================================
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; START / INIT
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;===================================================
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;===================================================
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loader_start:
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2024-04-08 05:19:19 +00:00
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jsr hardware_detect
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lda #<model_string
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sta OUTL
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lda #>model_string
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sta OUTH
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lda APPLEII_MODEL
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sta model_string+17
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cmp #'g'
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bne go_print
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lda #'s'
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sta model_string+18
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go_print:
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ldy #0
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print_model:
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lda (OUTL),Y
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beq print_model_done
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ora #$80
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sta $7d0,Y
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iny
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jmp print_model
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print_model_done:
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2024-03-09 18:36:33 +00:00
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lda #LOAD_TITLE
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sta WHICH_LOAD
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jsr init ; unhook DOS, init nibble table
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;===================================================
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;===================================================
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; SETUP THE FILENAME
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;===================================================
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;===================================================
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which_load_loop:
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; update the which-file error message
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; lda WHICH_LOAD
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; tay
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; lda which_disk,Y
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; sta error_string+19
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lda WHICH_LOAD
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asl
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tay
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lda filenames,Y
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sta OUTL
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lda filenames+1,Y
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sta OUTH
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lda WHICH_LOAD
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bne load_other
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load_intro:
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lda #<$4000
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sta entry_smc+1
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lda #>$4000
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sta entry_smc+2
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jmp actual_load
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load_other:
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lda #<$2000
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sta entry_smc+1
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lda #>$2000
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sta entry_smc+2
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actual_load:
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;===================================================
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;===================================================
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; SET UP DOS3.3 FILENAME
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;===================================================
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;===================================================
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load_file_and_execute:
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jsr opendir_filename
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entry_smc:
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jsr $1000 ; jump to common entry point
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; hope they updated the WHICH_LOAD value
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jmp which_load_loop
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;==============================
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; setup filename then open/load
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opendir_filename:
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; clear out the filename with $A0 (space)
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lda #<FILENAME
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sta namlo
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lda #>FILENAME
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sta namhi
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ldy #29
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wipe_filename_loop:
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lda #$A0
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sta (namlo),Y
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dey
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bpl wipe_filename_loop
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ldy #0
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copy_filename_loop:
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lda (OUTL),Y
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beq copy_filename_done
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ora #$80
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sta (namlo),Y
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iny
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bne copy_filename_loop
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copy_filename_done:
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jsr opendir ; open and read entire file into memory
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rts
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filenames:
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.word title_filename
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2024-03-11 05:37:08 +00:00
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.word mars_filename
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2024-03-09 18:36:33 +00:00
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.word keen1_filename
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.word keen2_filename
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title_filename:
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2024-04-04 19:56:45 +00:00
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.byte "TITLE",0
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2024-03-11 05:37:08 +00:00
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mars_filename:
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2024-04-04 19:56:45 +00:00
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.byte "MARS",0
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2024-03-09 18:36:33 +00:00
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keen1_filename:
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2024-04-04 19:56:45 +00:00
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.byte "LEVEL1",0
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2024-03-09 18:36:33 +00:00
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keen2_filename:
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2024-04-04 19:56:45 +00:00
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.byte "LEVEL2",0
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2024-03-09 18:36:33 +00:00
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;===================================================
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;===================================================
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; INIT (build nibble table)
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;===================================================
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;===================================================
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;unhook DOS and build nibble table
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init:
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; patch to use current drive
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; locate input paramater list
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jsr $3E3
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; result is in A:Y
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sta $FF
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sty $FE
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ldy #1
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lda ($FE),y
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; list+1 should have slot<<8
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ora #$80 ; add in $80
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; c0e0
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sta mlsmc06+1
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; c0e8
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clc
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adc #8
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sta mlsmc02+1
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sta mlsmc07+1
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; c0e9
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clc
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adc #1
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sta mlsmc01+1
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; c0ec
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clc
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adc #3
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sta mlsmc03+1
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sta mlsmc04+1
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sta mlsmc05+1
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jsr $fe93 ; clear COUT
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jsr $fe89 ; clear KEYIN
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;========================
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; Create nibble table
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; Note: the table starts 16 bytes in, and is sparse
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; so it doesn't entirely look like the DOS33 table at
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ldy #0
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ldx #3
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L1: stx $3c ; store tempx (3?)
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txa ; a=x (a=3)
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asl ; a*=2 (a=6)
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bit $3c ; a&tempx, set N/V (a=6)
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beq L3 ; if 0, skip to L3
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ora $3c ; a|=tempx (a=7)
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eor #$ff ; a=~a (a=f8)
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and #$7e ; a&=0x7e 0111 1110 (a=78)
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L2: bcs L3 ; this set way back at asl??
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lsr ; a>>1 a=3c c=0
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; a=1e c=0
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; a=0f c=0
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; a=07 c=1
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bne L2 ; if a!=0 goto l2
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tya ; if a==0, a=y
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sta nibtbl, x ; write out to table
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iny ; increment y
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L3: inx ; increment x x=4, a=0f
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bpl L1 ; loop while high bit not set
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rts
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;===================================================
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;===================================================
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; file not found
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;===================================================
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;===================================================
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file_not_found:
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mlsmc07:lda $c0e8 ; turn off drive motor?
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jsr TEXT
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jsr HOME
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ldy #0
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lda #<error_string
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sta OUTL
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lda #>error_string
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sta OUTH
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quick_print:
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lda (OUTL),Y
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beq quick_print_done
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jsr COUT1
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iny
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2024-04-08 05:19:19 +00:00
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; jmp quick_print
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2024-03-09 18:36:33 +00:00
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quick_print_done:
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2024-04-08 05:19:19 +00:00
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rts
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2024-03-09 18:36:33 +00:00
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; jsr quick_print
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fnf_keypress:
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lda KEYPRESS
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bpl fnf_keypress
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bit KEYRESET
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jmp which_load_loop
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; offset for disk number is 19
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error_string:
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.byte "PLEASE INSERT DISK 1, PRESS RETURN",0
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2024-04-08 05:19:19 +00:00
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model_string:
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.byte "DETECTED APPLE II",0,0,0
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2024-03-09 18:36:33 +00:00
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;===================================================
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;===================================================
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; OPENDIR: actually load the file
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;===================================================
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;===================================================
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; turn on drive and read volume table of contents
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opendir:
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mlsmc01:lda $c0e9 ; turn slot#6 drive on
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ldx #0
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stx adrlo ; zero out adrlo
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stx secsize ; zero out secsize
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lda #$11 ; a=$11 (VTOC)
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jsr readdirsec
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firstent:
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lda dirbuf+1
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; lock if entry not found
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entry_not_found:
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beq file_not_found
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; read directory sector
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ldx dirbuf+2
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jsr seekread1
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ldy #7 ;number of directory entries in a sector
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ldx #$2b ;offset of filename in directory entry
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nextent:
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tya
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pha ; was **phy**
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txa
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pha ; was **phx**
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ldy #$1d
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; match name backwards (slower but smaller)
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L4:
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lda (namlo), y
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cmp dirbuf, x
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beq foundname
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pla
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; move to next directory in this block, if possible
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|
|
clc
|
|
|
|
|
adc #$23
|
|
|
|
|
tax
|
|
|
|
|
pla
|
|
|
|
|
tay ; was **ply**
|
|
|
|
|
dey
|
|
|
|
|
bne nextent
|
|
|
|
|
beq firstent ; was **bra**
|
|
|
|
|
|
|
|
|
|
foundname:
|
|
|
|
|
dex
|
|
|
|
|
dey
|
|
|
|
|
bpl L4
|
|
|
|
|
pla
|
|
|
|
|
tay ; was **ply**
|
|
|
|
|
pla
|
|
|
|
|
|
|
|
|
|
; read track/sector list
|
|
|
|
|
|
|
|
|
|
lda dirbuf-32, y
|
|
|
|
|
ldx dirbuf-31, y
|
|
|
|
|
jsr seekread1
|
|
|
|
|
|
|
|
|
|
; read load offset and length info only, initially
|
|
|
|
|
|
|
|
|
|
lda #<filbuf
|
|
|
|
|
sta adrlo
|
|
|
|
|
lda #4
|
|
|
|
|
sta secsize
|
|
|
|
|
lda dirbuf+12
|
|
|
|
|
ldx dirbuf+13
|
|
|
|
|
ldy #>filbuf
|
|
|
|
|
jsr seekread
|
|
|
|
|
|
|
|
|
|
; reduce load offset by 4, to account for offset and length
|
|
|
|
|
|
|
|
|
|
sec
|
|
|
|
|
lda filbuf
|
|
|
|
|
sbc #4
|
|
|
|
|
sta adrlo
|
|
|
|
|
|
|
|
|
|
lda filbuf+1
|
|
|
|
|
sbc #0
|
|
|
|
|
sta adrhi
|
|
|
|
|
|
|
|
|
|
; save on stack bytes that will be overwritten by extra read
|
|
|
|
|
|
|
|
|
|
ldy #3
|
|
|
|
|
L5:
|
|
|
|
|
lda (adrlo), y
|
|
|
|
|
pha
|
|
|
|
|
dey
|
|
|
|
|
bpl L5
|
|
|
|
|
|
|
|
|
|
lda adrhi
|
|
|
|
|
pha
|
|
|
|
|
lda adrlo
|
|
|
|
|
pha
|
|
|
|
|
|
|
|
|
|
; increase load size by 4, to account for offst and length
|
|
|
|
|
|
|
|
|
|
lda filbuf+2
|
|
|
|
|
adc #3
|
|
|
|
|
sta sizelo
|
|
|
|
|
sta secsize
|
|
|
|
|
|
|
|
|
|
lda filbuf+3
|
|
|
|
|
adc #0
|
|
|
|
|
sta sizehi
|
|
|
|
|
beq readfirst
|
|
|
|
|
lda #0 ; was **stz secsize**
|
|
|
|
|
sta secsize
|
|
|
|
|
|
|
|
|
|
readfirst:
|
|
|
|
|
ldy #$0c
|
|
|
|
|
|
|
|
|
|
; read a file sector
|
|
|
|
|
|
|
|
|
|
readnext:
|
|
|
|
|
tya
|
|
|
|
|
pha
|
|
|
|
|
lda dirbuf, y ; A = track
|
|
|
|
|
ldx dirbuf+1, y ; x = sector
|
|
|
|
|
jsr seekread1
|
|
|
|
|
pla
|
|
|
|
|
tay
|
|
|
|
|
|
|
|
|
|
; if low count is non-zero then we are done
|
|
|
|
|
; (can happen only for partial last block)
|
|
|
|
|
|
|
|
|
|
lda secsize
|
|
|
|
|
bne readdone
|
|
|
|
|
|
|
|
|
|
; continue if more than $100 bytes left
|
|
|
|
|
|
|
|
|
|
dec sizehi
|
|
|
|
|
bne L6
|
|
|
|
|
|
|
|
|
|
; set read size to min(length, $100)
|
|
|
|
|
|
|
|
|
|
lda sizelo
|
|
|
|
|
beq readdone
|
|
|
|
|
sta secsize
|
|
|
|
|
L6:
|
|
|
|
|
inc adrhi
|
|
|
|
|
iny
|
|
|
|
|
iny
|
|
|
|
|
bne readnext
|
|
|
|
|
|
|
|
|
|
; save current address for after t/s read
|
|
|
|
|
|
|
|
|
|
lda adrhi
|
|
|
|
|
pha
|
|
|
|
|
lda adrlo
|
|
|
|
|
pha
|
|
|
|
|
lda #0
|
|
|
|
|
sta adrlo ; was **stz adrlo**
|
|
|
|
|
|
|
|
|
|
; read next track/sector sector
|
|
|
|
|
|
|
|
|
|
lda dirbuf+1
|
|
|
|
|
ldx dirbuf+2
|
|
|
|
|
jsr readdirsec
|
|
|
|
|
clc
|
|
|
|
|
|
|
|
|
|
; restore current address
|
|
|
|
|
readdone:
|
|
|
|
|
pla
|
|
|
|
|
sta adrlo ; code originally had this backwards
|
|
|
|
|
pla
|
|
|
|
|
sta adrhi
|
|
|
|
|
bcc readfirst
|
|
|
|
|
|
|
|
|
|
mlsmc02:lda $c0e8
|
|
|
|
|
|
|
|
|
|
; restore from stack bytes that were overwritten by extra read
|
|
|
|
|
|
|
|
|
|
ldx #3
|
|
|
|
|
ldy #0
|
|
|
|
|
L7:
|
|
|
|
|
pla
|
|
|
|
|
sta (adrlo), y
|
|
|
|
|
iny
|
|
|
|
|
dex
|
|
|
|
|
bpl L7
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;======================
|
|
|
|
|
; readdirsec
|
|
|
|
|
;======================
|
|
|
|
|
; a = track?
|
|
|
|
|
; x = sector?
|
|
|
|
|
readdirsec:
|
|
|
|
|
ldy #>dirbuf
|
|
|
|
|
seekread:
|
|
|
|
|
sty adrhi
|
|
|
|
|
seekread1:
|
|
|
|
|
sta phase
|
|
|
|
|
lda sectbl, x
|
|
|
|
|
sta reqsec
|
|
|
|
|
jsr readadr
|
|
|
|
|
|
|
|
|
|
; if track does not match, then seek
|
|
|
|
|
|
|
|
|
|
cpx phase
|
|
|
|
|
beq checksec
|
|
|
|
|
jsr seek
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;=========================================
|
|
|
|
|
; re merge in with qkumba's recent changes
|
|
|
|
|
; to fix seek problem?
|
|
|
|
|
;=========================================
|
|
|
|
|
|
|
|
|
|
; [re-]read sector
|
|
|
|
|
|
|
|
|
|
re_read_addr:
|
|
|
|
|
jsr readadr
|
|
|
|
|
checksec:
|
|
|
|
|
cmp reqsec
|
|
|
|
|
bne re_read_addr
|
|
|
|
|
|
|
|
|
|
;=========================
|
|
|
|
|
; read sector data
|
|
|
|
|
;=========================
|
|
|
|
|
|
|
|
|
|
readdata:
|
|
|
|
|
jsr readd5aa
|
|
|
|
|
eor #$ad ; zero A if match
|
|
|
|
|
bne re_read_addr
|
|
|
|
|
|
|
|
|
|
L12:
|
|
|
|
|
mlsmc03:ldx $c0ec ; read until valid data (high bit set)
|
|
|
|
|
bpl L12
|
|
|
|
|
eor nibtbl-$80, x
|
|
|
|
|
sta bit2tbl-$aa, y
|
|
|
|
|
iny
|
|
|
|
|
bne L12
|
|
|
|
|
L13:
|
|
|
|
|
mlsmc04:ldx $c0ec ; read until valid data (high bit set)
|
|
|
|
|
bpl L13
|
|
|
|
|
eor nibtbl-$80, x
|
|
|
|
|
sta (adrlo), y ; the real address
|
|
|
|
|
iny
|
|
|
|
|
cpy secsize
|
|
|
|
|
bne L13
|
|
|
|
|
ldy #0
|
|
|
|
|
L14:
|
|
|
|
|
ldx #$a9
|
|
|
|
|
L15:
|
|
|
|
|
inx
|
|
|
|
|
beq L14
|
|
|
|
|
lda (adrlo), y
|
|
|
|
|
lsr bit2tbl-$aa, x
|
|
|
|
|
rol
|
|
|
|
|
lsr bit2tbl-$aa, x
|
|
|
|
|
rol
|
|
|
|
|
sta (adrlo), y
|
|
|
|
|
iny
|
|
|
|
|
cpy secsize
|
|
|
|
|
bne L15
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
; no tricks here, just the regular stuff
|
|
|
|
|
|
|
|
|
|
;=======================
|
|
|
|
|
; readaddr -- read the address field
|
|
|
|
|
;=======================
|
|
|
|
|
; Find address field, put track in cutrk, sector in tmpsec
|
|
|
|
|
|
|
|
|
|
readadr:
|
|
|
|
|
jsr readd5aa
|
|
|
|
|
cmp #$96
|
|
|
|
|
bne readadr
|
|
|
|
|
ldy #3 ; three?
|
|
|
|
|
; first read volume/volume
|
|
|
|
|
; then track/track
|
|
|
|
|
; then sector/sector?
|
|
|
|
|
adr_read_two_bytes:
|
|
|
|
|
tax
|
|
|
|
|
jsr readnib
|
|
|
|
|
rol
|
|
|
|
|
sta tmpsec
|
|
|
|
|
jsr readnib
|
|
|
|
|
and tmpsec
|
|
|
|
|
dey
|
|
|
|
|
bne adr_read_two_bytes
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
;========================
|
|
|
|
|
; make sure we see the $D5 $AA pattern
|
|
|
|
|
|
|
|
|
|
readd5aa:
|
|
|
|
|
L16:
|
|
|
|
|
jsr readnib
|
|
|
|
|
L17:
|
|
|
|
|
cmp #$d5
|
|
|
|
|
bne L16
|
|
|
|
|
jsr readnib
|
|
|
|
|
cmp #$aa
|
|
|
|
|
bne L17
|
|
|
|
|
tay ; we need Y=#$AA later
|
|
|
|
|
|
|
|
|
|
readnib:
|
|
|
|
|
mlsmc05:lda $c0ec ; read until valid (high bit set)
|
|
|
|
|
bpl readnib
|
|
|
|
|
|
|
|
|
|
seekret:
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
;=====================
|
|
|
|
|
; SEEK
|
|
|
|
|
;=====================
|
|
|
|
|
; current track in X?
|
|
|
|
|
; desired track in phase
|
|
|
|
|
|
|
|
|
|
seek:
|
|
|
|
|
ldy #0
|
|
|
|
|
sty step
|
|
|
|
|
asl phase ; multiply by two
|
|
|
|
|
txa ; current track?
|
|
|
|
|
asl ; mul by two
|
|
|
|
|
copy_cur:
|
|
|
|
|
tax
|
|
|
|
|
sta tmptrk
|
|
|
|
|
sec
|
|
|
|
|
sbc phase
|
|
|
|
|
beq L22
|
|
|
|
|
bcs L18
|
|
|
|
|
eor #$ff
|
|
|
|
|
inx
|
|
|
|
|
bcc L19
|
|
|
|
|
L18:
|
|
|
|
|
sbc #1
|
|
|
|
|
dex
|
|
|
|
|
L19:
|
|
|
|
|
cmp step
|
|
|
|
|
bcc L20
|
|
|
|
|
lda step
|
|
|
|
|
L20:
|
|
|
|
|
cmp #8
|
|
|
|
|
bcs L21
|
|
|
|
|
tay
|
|
|
|
|
sec
|
|
|
|
|
L21:
|
|
|
|
|
txa
|
|
|
|
|
pha
|
|
|
|
|
ldx step1, y
|
|
|
|
|
L22:
|
|
|
|
|
php
|
|
|
|
|
bne L24
|
|
|
|
|
L23:
|
|
|
|
|
clc
|
|
|
|
|
lda tmptrk
|
|
|
|
|
ldx step2, y
|
|
|
|
|
L24:
|
|
|
|
|
stx tmpsec
|
|
|
|
|
and #3
|
|
|
|
|
rol
|
|
|
|
|
tax
|
|
|
|
|
lsr
|
|
|
|
|
mlsmc06:lda $c0e0, x
|
|
|
|
|
L25:
|
|
|
|
|
ldx #$12
|
|
|
|
|
L26:
|
|
|
|
|
dex
|
|
|
|
|
bpl L26
|
|
|
|
|
dec tmpsec
|
|
|
|
|
bne L25
|
|
|
|
|
bcs L23
|
|
|
|
|
plp
|
|
|
|
|
beq seekret
|
|
|
|
|
pla
|
|
|
|
|
inc step
|
|
|
|
|
bne copy_cur
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
step1: .byte $01, $30, $28, $24, $20, $1e, $1d, $1c
|
|
|
|
|
step2: .byte $70, $2c, $26, $22, $1f, $1e, $1d, $1c
|
|
|
|
|
|
|
|
|
|
sectbl: .byte $00,$0d,$0b,$09,$07,$05,$03,$01,$0e,$0c,$0a,$08,$06,$04,$02,$0f
|
|
|
|
|
|
|
|
|
|
|
2024-04-08 05:19:19 +00:00
|
|
|
.include "hardware_detect.s"
|
|
|
|
|
|
2024-03-09 18:36:33 +00:00
|
|
|
; From $BA96 of DOS33
|
|
|
|
|
;nibtbl: .res 128 ; = *
|
|
|
|
|
; .byte $00,$01,$98,$99,$02,$03,$9C,$04 ; $BA96 ; 00
|
|
|
|
|
; .byte $05,$06,$A0,$A1,$A2,$A4,$A4,$A5 ; $BA9E ; 08
|
|
|
|
|
; .byte $07,$08,$A8,$A9,$AA,$09,$0A,$0B ; $BAA6 ; 10
|
|
|
|
|
; .byte $0C,$0D,$B0,$B1,$0E,$0F,$10,$11 ; $BAAE ; 18
|
|
|
|
|
; .byte $12,$13,$B8,$14,$15,$16,$17,$18 ; $BAB6 ; 20
|
|
|
|
|
; .byte $19,$1A,$C0,$C1,$C2,$C3,$C4,$C5 ; $BABE ; 28
|
|
|
|
|
; .byte $C6,$C7,$C8,$C9,$CA,$1B,$CC,$1C ; $BAC6 ; 30
|
|
|
|
|
; .byte $1D,$1E,$D0,$D1,$D2,$1E,$D4,$D5 ; $BACE ; 38
|
|
|
|
|
; .byte $20,$21,$D8,$22,$23,$24,$25,$26 ; $BAD6 ; 40
|
|
|
|
|
; .byte $27,$28,$E0,$E1,$E2,$E3,$E4,$29 ; $BADE ; 48
|
|
|
|
|
; .byte $2A,$2B,$E8,$2C,$2D,$2E,$2F,$30 ; $BAE6 ; 50
|
|
|
|
|
; .byte $31,$32,$F0,$F1,$33,$34,$35,$36 ; $BAEE ; 58
|
|
|
|
|
; .byte $37,$38,$F8,$39,$3A,$3B,$3C,$3D ; $BAF6 ; 60
|
|
|
|
|
; .byte $3E,$3F,$13,$00,$01,$02,$01,$00 ; $BAFE ; 68
|
|
|
|
|
; .byte $00,$00,$00,$00,$00,$00,$00,$00
|
|
|
|
|
; .byte $00,$00,$00,$00,$00,$00,$00,$00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;bit2tbl: .res 86 ; = nibtbl+128
|
|
|
|
|
;filbuf: .res 4 ; = bit2tbl+86
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;dataend = filbuf+4
|
|
|
|
|
|
|
|
|
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loader_end:
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.assert (<loader_end - <loader_start)>16, error, "loader too big"
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