2022-05-25 18:46:02 +00:00
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NEW
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AUTO 3,1
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*--------------------------------------
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* 0, 2, 4, 6, 8, 10, 12, 14, 1, 3, 5, 7, 9, 11, 13, 15
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*
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* $0800 : Block 00 ProDOS (sect 0,2)
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* $0A00 : Block 01 SOS (sect 4,6)
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* $0C00 : Block 02 Cat (sect 8,10)
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* $0E00 : Block 03 Cat (sect 12,14)
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* $1000 : Block 04 Cat (sect 1,3)
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* $1200 : Block 05 Cat (sect 5,7)
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*--------------------------------------
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ROM.D2.DataBuf .EQ $26
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ROM.D2.Slotn0 .EQ $2b
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ROM.D2.oddbits .EQ $3c
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ROM.D2.ReqSect .EQ $3d
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BB.RetryCnt .EQ $40
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BB.TargetTrk .EQ $41
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ZP.BLK.CMD .EQ $42
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ZP.BLK.UNIT .EQ $43
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ZP.BLK.BUFPTR .EQ $44
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ZP.BLK.BLKNUM .EQ $46
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ZP.FX2.GoROM .EQ $48 device call entry address
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ZP.FX2.iBLKLO .EQ $4a pointer to low page of index block
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ZP.FX2.iBLKHI .EQ $4c pointer to high page of index block
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ZP.FX2.iBLKPtr .EQ $4e index byte pointer
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BB.CurrentQTrack .EQ $50
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BB.TargetQTrack .EQ $51
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BB.tmpTrk .EQ $52
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BB.FX2.AddrField .EQ $53
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BB.FX2.AddrField.S .EQ $54
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BB.FX2.AddrField.T .EQ $55
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BB.FX2.AddrField.V .EQ $56
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*--------------------------------------
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iobuff .EQ $60
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nbuf1 .EQ $300
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dnib .EQ $2d6
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clrscrn .EQ $fc58
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BB.FX2.CATBLK1 .EQ $c00
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*--------------------------------------
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*
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* BLOCK 0
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*
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*--------------------------------------
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.PH $800
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BB.FX2.Boot .DA #1
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sec Apple /// enters $800 'ora $38'
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bcs BB.FX2.Apple2 branch if not apple iii native mode
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*--------------------------------------
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BB.FX2.Apple3 lda #$9f make Apple /// boot using block 1
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pha the return address is $a000
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lda #$ff
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pha
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inc
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tax ldx #0
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inc lda #1 (read block 1)
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jmp $f479
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*--------------------------------------
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BB.FX2.Apple2 stx ZP.BLK.UNIT save unit number
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cmp #3
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php
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txa find out if disk ii
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and #$70 strip drive # if any
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lsr
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lsr get slot address
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lsr
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lsr
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ora #$c0
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sta ZP.FX2.GoROM+1
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ldy #0
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sty ZP.FX2.GoROM
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plp
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dey Y=#$ff
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lda (ZP.FX2.GoROM),y get device entry addr
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bne BB.FX2.BDEV branch if not disk ii (16 sector)
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bcs BB.FX2.BDEV 2 sectors read
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lda #3 make rom read only sector 2
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sta BB.FX2.Boot to complete block 0
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inc ROM.D2.ReqSect was = 1
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lda ZP.FX2.GoROM+1
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pha
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lda #$5b
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pha
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rts
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*--------------------------------------
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BB.FX2.BDEV sta ZP.FX2.GoROM save low adr of device call entry.
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ldy #0
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sty iobuff $0A00
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sty ZP.BLK.BLKNUM+1 $0001
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sty BB.FX2.AddrField.V tell BB.FX2.SeekReadD2 vol 00
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sty BB.FX2.AddrField.T tell BB.FX2.SeekReadD2 we are on track 0
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iny Y=1
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sty ZP.BLK.CMD set read command.
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sty ZP.BLK.BLKNUM to read SOS+directory blocks
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lda #$0A 1-5 at $A00
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sta iobuff+1 $0A00
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.1 jsr BB.FX2.ReadBLK
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bcs .9 give up on error.
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inc ZP.BLK.BLKNUM
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lda ZP.BLK.BLKNUM have all directory blocks been read?
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cmp #6
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bcc .1 loop if not.
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jmp BB.FX2.ScanCat
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.9 jmp BB.FX2.BootErr
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*--------------------------------------
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BB.FX2.ReadBLK lda iobuff
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sta ZP.BLK.BUFPTR
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lda iobuff+1
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sta ZP.BLK.BUFPTR+1
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inc iobuff+1
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inc iobuff+1
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lda ZP.FX2.GoROM
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beq BB.FX2.ReadD2
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jmp (ZP.FX2.GoROM)
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*--------------------------------------
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BB.FX2.ReadD2 lda ZP.BLK.BLKNUM figure out track & sector.
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and #7 strip track for now.
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cmp #4
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and #3
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php
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asl
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plp
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rol now we have the first sector of block.
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sta ROM.D2.ReqSect
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lda ZP.BLK.BLKNUM+1 get high block #
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lsr shift hi addr to carry.
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lda ZP.BLK.BLKNUM now figure track #
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ror
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lsr
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lsr
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sta BB.TargetTrk
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*--------------------------------------
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lda ZP.BLK.BUFPTR+1
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sta ROM.D2.DataBuf+1
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ldx ROM.D2.Slotn0
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lda IO.D2.DrvOn,x
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jsr BB.FX2.SeekReadD2
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inc ROM.D2.DataBuf+1 bump address
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inc ROM.D2.ReqSect
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inc ROM.D2.ReqSect and sector #
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bcs .9 branch if error.
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jsr BB.FX2.ReadSectD2
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.9 ldx ROM.D2.Slotn0
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ldy IO.D2.DrvOff,x
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rts return error status in carry.
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*--------------------------------------
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BB.FX2.HeadSelect
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lda BB.FX2.AddrField.V
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beq .8 VOL = 00
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asl
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bcc .8 single sided
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bmi .8 > 192
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lda BB.TargetTrk
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and #1
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lsr
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php
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rol
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rol A = 0/2
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ora ROM.D2.Slotn0
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tay y = n0/n2
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lda IO.D2.Ph0On,y
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lda IO.D2.Ph0On+4,y
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lda #1
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jsr BB.Wait100usecA
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lda IO.D2.Ph0Off,y
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lda IO.D2.Ph0Off+4,y
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lsr BB.FX2.AddrField.T
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plp
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rol BB.FX2.AddrField.T
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.8 rts
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*--------------------------------------
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BB.FX2.Trk2Qtrk
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ldy BB.FX2.AddrField.V
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beq .5
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cpy #$85
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bcs .5 > 192 ? must be a buggy 254
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sta BB.tmpTrk
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tya
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and #%00000111 stepping
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tay
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lda #0
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clc
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.2 adc BB.tmpTrk
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dey
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bne .2
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rts
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.5 asl X4 standard stepping
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asl
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BB.Trk2Qtrk.RTS rts
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*--------------------------------------
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2022-06-12 20:42:22 +00:00
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BB.FX2.SeekPhOnY
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and #6
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ora ROM.D2.Slotn0
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tay
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lda IO.D2.Ph0On,y
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rts
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*--------------------------------------
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2022-05-25 18:46:02 +00:00
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BB.FX2.SeekReadD2
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jsr BB.FX2.HeadSelect
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lda BB.TargetTrk
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jsr BB.FX2.Trk2Qtrk
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sta BB.TargetQTrack
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lda BB.FX2.AddrField.T
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jsr BB.FX2.Trk2Qtrk
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sta BB.CurrentQTrack
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cmp BB.TargetQTrack
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beq BB.FX2.ReadSectD2
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2022-08-20 14:37:37 +00:00
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bit #1 A = Current QT
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2022-06-12 20:42:22 +00:00
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beq .2 we are on 0/4 or 2/4 track
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2022-08-20 14:37:37 +00:00
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2022-06-12 20:42:22 +00:00
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pha
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2022-05-25 18:46:02 +00:00
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2022-06-12 20:42:22 +00:00
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bcc .1 if CC, C < T, must move in
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2022-05-25 18:46:02 +00:00
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2022-08-20 14:37:37 +00:00
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inc move out: X = Ph(N+1)
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.1 jsr BB.FX2.SeekPhOnY move in : X = Ph(N)
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2022-06-18 06:16:39 +00:00
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tya
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2022-06-12 20:42:22 +00:00
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tax
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2022-08-20 14:37:37 +00:00
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2022-06-12 20:42:22 +00:00
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pla
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2022-08-20 14:37:37 +00:00
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2022-05-25 18:46:02 +00:00
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bcs .2 if CS, C > T, must move out
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2022-06-12 20:42:22 +00:00
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inc move in : Y = Ph(N+1)
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2022-05-25 18:46:02 +00:00
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2022-06-12 20:42:22 +00:00
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.2 jsr BB.FX2.SeekPhOnY move out: Y = Ph(N)
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2022-06-18 06:16:39 +00:00
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2022-08-20 14:37:37 +00:00
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bra .9 Ph ON to go to 0/4 or 2/4, no wait
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2022-05-25 18:46:02 +00:00
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*--------------------------------------
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.3 bcs .4 if CS, C > T, must move out
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inc CC: C < T, ON next PH
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.HS B0 BCS
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.4 dec CS: C > T, ON prev PH
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sta BB.CurrentQTrack
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bit #1
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bne .5 we must go to 1/4 or 3/4
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lda IO.D2.Ph0Off,x we must go to 0/4 or 2/4 : Off Prev Ph
|
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|
|
bra .8 go wait....
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|
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.5 phy we must go on 1/4 or 3/4
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|
|
plx Y already ON, -> X for Ph0Off,x
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|
|
|
bcs .6 if CS, C > T, must move out
|
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|
|
inc CC: C < T, ON next PH
|
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|
|
2022-06-12 20:42:22 +00:00
|
|
|
|
.6 jsr BB.FX2.SeekPhOnY now X and Y on
|
2022-05-25 18:46:02 +00:00
|
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|
|
|
|
.8 lda #IO.D2.SeekTimeB
|
2022-08-20 14:37:37 +00:00
|
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|
|
|
2022-06-12 20:42:22 +00:00
|
|
|
|
jsr BB.Wait100usecA ...wait...
|
2022-05-25 18:46:02 +00:00
|
|
|
|
|
2022-06-12 20:42:22 +00:00
|
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|
|
.9 lda BB.CurrentQTrack
|
2022-05-25 18:46:02 +00:00
|
|
|
|
cmp BB.TargetQTrack
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|
|
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|
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bne .3
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lsr CS if X,Y on
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lda #0
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|
|
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jsr BB.Wait100usecA
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|
2022-08-20 14:37:37 +00:00
|
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lda IO.D2.Ph0Off,y
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|
2022-06-12 20:42:22 +00:00
|
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bcc .10
|
2022-05-25 18:46:02 +00:00
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|
2022-08-20 14:37:37 +00:00
|
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clc
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|
2022-05-25 18:46:02 +00:00
|
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|
lda IO.D2.Ph0Off,x
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|
2022-08-20 14:37:37 +00:00
|
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|
.10
|
2022-05-25 18:46:02 +00:00
|
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|
|
*--------------------------------------
|
|
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|
|
BB.FX2.ReadSectD2
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ldx ROM.D2.Slotn0
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stz BB.RetryCnt
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php
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tryread plp fix stack.
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|
|
rdhead sec anticipate error.
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|
|
|
inc BB.RetryCnt if = 0 then give up!
|
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|
|
beq BB.Trk2Qtrk.RTS branch if can't fine/read sector.
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|
clc indicate reading header.
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|
ldy #0 Retry cnt waiting D5
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rddata php carry set if reading DATA.
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rd0 iny
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|
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|
|
beq tryread
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|
|
rd1 lda IO.D2.RData,x read a byte from the state machine.
|
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|
|
|
|
bpl rd1 loop until ready.
|
|
|
|
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|
|
rd1a eor #$d5 mark 1?
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|
|
|
bne rd0 branch if not.
|
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|
rd2 lda IO.D2.RData,x
|
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|
|
|
bpl rd2
|
|
|
|
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|
|
|
|
|
cmp #$aa mark 2?
|
|
|
|
|
|
bne rd1a
|
|
|
|
|
|
nop waste a little time.
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|
|
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|
|
|
|
rd3 lda IO.D2.RData,x
|
|
|
|
|
|
bpl rd3
|
|
|
|
|
|
|
|
|
|
|
|
cmp #$96 header mark 3?
|
|
|
|
|
|
beq rdhd1 branch if it is.
|
|
|
|
|
|
|
|
|
|
|
|
plp were we looking for data mark 3?
|
|
|
|
|
|
bcc rdhead branch if not.
|
|
|
|
|
|
|
|
|
|
|
|
eor #$ad data mark 3?
|
|
|
|
|
|
beq rddt1 go read data field if true...
|
|
|
|
|
|
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|
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|
|
|
rdhd0 bne rdhead otherwise, start over.
|
|
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|
rdhd1 ldy #3 read volume,trk,sect
|
|
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|
|
rdhd2 lda IO.D2.RData,x
|
|
|
|
|
|
bpl rdhd2
|
|
|
|
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|
|
rol
|
|
|
|
|
|
sta ROM.D2.oddbits save odd bits (7,5,3,1)
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|
rdhd4 lda IO.D2.RData,x
|
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|
|
|
|
bpl rdhd4
|
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|
|
and ROM.D2.oddbits combine even and odd to form value.
|
|
|
|
|
|
sta BB.FX2.AddrField,y
|
|
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|
|
dey
|
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|
|
|
bne rdhd2 ignore Checksum, A=sector
|
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|
|
plp
|
|
|
|
|
|
cmp ROM.D2.ReqSect last byte formed is sector#
|
|
|
|
|
|
bne rdhead branch if target sector not found.
|
|
|
|
|
|
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|
|
|
|
lda BB.FX2.AddrField.T previous result is track #
|
|
|
|
|
|
cmp BB.TargetTrk is desired track found?
|
|
|
|
|
|
bne goseek re-seek if mismatch.
|
|
|
|
|
|
|
|
|
|
|
|
bcs rddata branch if proper track always.
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
rddt1 ldy #$56 read 2 bit groupings first.
|
|
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|
|
|
rddt1a sty ROM.D2.oddbits
|
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|
|
|
rddt2 ldy IO.D2.RData,x
|
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|
|
|
bpl rddt2
|
|
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|
|
|
|
|
eor dnib,y denibblize using table left from boot rom.
|
|
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|
|
|
ldy ROM.D2.oddbits save in nbuf1
|
|
|
|
|
|
dey
|
|
|
|
|
|
sta nbuf1,y
|
|
|
|
|
|
bne rddt1a loop until all 86 groups are read.
|
|
|
|
|
|
|
|
|
|
|
|
rddt3 sty ROM.D2.oddbits now count up for 6-bit groups.
|
|
|
|
|
|
|
|
|
|
|
|
rddt4 ldy IO.D2.RData,x
|
|
|
|
|
|
bpl rddt4
|
|
|
|
|
|
|
|
|
|
|
|
eor dnib,y
|
|
|
|
|
|
ldy ROM.D2.oddbits save result to specified buffer.
|
|
|
|
|
|
sta (ROM.D2.DataBuf),y
|
|
|
|
|
|
iny
|
|
|
|
|
|
bne rddt3 loop for 256 bytes.
|
|
|
|
|
|
|
|
|
|
|
|
rdchk ldy IO.D2.RData,x now verify checksum...
|
|
|
|
|
|
bpl rdchk
|
|
|
|
|
|
|
|
|
|
|
|
eor dnib,y must be equal...
|
|
|
|
|
|
bne rdhd0 branch if error.
|
|
|
|
|
|
|
|
|
|
|
|
ldy #0 make y=0
|
|
|
|
|
|
|
|
|
|
|
|
nxttwo ldx #$56 now combine 2-bit group with 6 bit group
|
|
|
|
|
|
|
|
|
|
|
|
twobit dex all done with this group?
|
|
|
|
|
|
bmi nxttwo branch if so.
|
|
|
|
|
|
|
|
|
|
|
|
lda (ROM.D2.DataBuf),y
|
|
|
|
|
|
lsr nbuf1,x
|
|
|
|
|
|
rol
|
|
|
|
|
|
lsr nbuf1,x
|
|
|
|
|
|
rol
|
|
|
|
|
|
sta (ROM.D2.DataBuf),y
|
|
|
|
|
|
iny
|
|
|
|
|
|
bne twobit
|
|
|
|
|
|
|
|
|
|
|
|
clc
|
|
|
|
|
|
rts
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
goseek jmp BB.FX2.SeekReadD2
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
BB.Wait100usecA phx (3)
|
|
|
|
|
|
|
2022-08-20 14:37:37 +00:00
|
|
|
|
.1 ldx #19 (2)
|
2022-05-25 18:46:02 +00:00
|
|
|
|
|
|
|
|
|
|
.2 dex (2)
|
|
|
|
|
|
bne .2 (3)
|
|
|
|
|
|
|
|
|
|
|
|
dec (2)
|
|
|
|
|
|
bne .1 (3)
|
|
|
|
|
|
|
|
|
|
|
|
plx (4)
|
|
|
|
|
|
|
|
|
|
|
|
rts (6)
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
BB.FX2.BootErr jsr clrscrn clear video
|
|
|
|
|
|
ldy #BB.MSG.ERR.Len-1
|
|
|
|
|
|
|
|
|
|
|
|
.1 lda BB.MSG.ERR,y
|
|
|
|
|
|
sta $5b6,y
|
|
|
|
|
|
dey
|
|
|
|
|
|
bpl .1
|
|
|
|
|
|
|
|
|
|
|
|
jmp $ff69
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
BB.MSG.ERR .AS -"BOOT ERROR"
|
|
|
|
|
|
BB.MSG.ERR.Len .EQ *-BB.MSG.ERR
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
*
|
|
|
|
|
|
* BLOCK 1
|
|
|
|
|
|
*
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
BB.FX2.ScanCat ldy #0
|
|
|
|
|
|
sty ZP.FX2.iBLKLO
|
|
|
|
|
|
sty ZP.FX2.iBLKHI
|
|
|
|
|
|
sty ZP.FX2.iBLKPtr
|
|
|
|
|
|
|
|
|
|
|
|
sta ZP.FX2.iBLKLO+1
|
|
|
|
|
|
|
|
|
|
|
|
lda #4 begin look-up with first entry past header.
|
|
|
|
|
|
.HS 2C BIT ABS
|
|
|
|
|
|
.1 lda ZP.FX2.iBLKLO
|
|
|
|
|
|
clc
|
|
|
|
|
|
adc BB.FX2.CATBLK1+$23 ENTRY_LEN : bump to next directory entry.
|
|
|
|
|
|
tay save in y for now.
|
|
|
|
|
|
bcc .2 branch if not a page cross.
|
|
|
|
|
|
|
|
|
|
|
|
inc ZP.FX2.iBLKLO+1
|
|
|
|
|
|
lda ZP.FX2.iBLKLO+1 check for new block.
|
|
|
|
|
|
lsr if even then new block.
|
|
|
|
|
|
bcs .2
|
|
|
|
|
|
|
|
|
|
|
|
cmp #$a have all file names been compared?
|
|
|
|
|
|
beq BB.FX2.BootErr branch if no pro.kernel.
|
|
|
|
|
|
|
|
|
|
|
|
ldy #4 else, begin at block beginning.
|
|
|
|
|
|
|
|
|
|
|
|
.2 sty ZP.FX2.iBLKLO
|
|
|
|
|
|
|
|
|
|
|
|
ldy #6
|
|
|
|
|
|
|
|
|
|
|
|
.3 lda (ZP.FX2.iBLKLO),y look for matching name.
|
|
|
|
|
|
cmp BB.FX2.ProDOS,y
|
|
|
|
|
|
bne .1 branch if no match.
|
|
|
|
|
|
|
|
|
|
|
|
dey
|
|
|
|
|
|
bpl .3
|
|
|
|
|
|
|
|
|
|
|
|
* ldy #$10 get file type & index block addr.
|
|
|
|
|
|
* lda (ZP.FX2.iBLKLO),y
|
|
|
|
|
|
* cmp #S.FI.T.SYS is it a system file?
|
|
|
|
|
|
* bne BB.FX2.BootErr
|
|
|
|
|
|
* iny
|
|
|
|
|
|
|
|
|
|
|
|
ldy #$11
|
|
|
|
|
|
|
|
|
|
|
|
lda (ZP.FX2.iBLKLO),y
|
|
|
|
|
|
sta ZP.BLK.BLKNUM
|
|
|
|
|
|
iny
|
|
|
|
|
|
lda (ZP.FX2.iBLKLO),y
|
|
|
|
|
|
sta ZP.BLK.BLKNUM+1
|
|
|
|
|
|
|
|
|
|
|
|
stz ZP.FX2.iBLKLO
|
|
|
|
|
|
stz ZP.FX2.iBLKHI
|
|
|
|
|
|
|
|
|
|
|
|
ldy #$1e read index block at $1e00 and
|
|
|
|
|
|
sty ZP.FX2.iBLKLO+1 kernel at $2000
|
|
|
|
|
|
sty iobuff+1
|
|
|
|
|
|
iny
|
|
|
|
|
|
sty ZP.FX2.iBLKHI+1
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
BB.FX2.LOADSYS jsr BB.FX2.ReadBLK read index block.
|
|
|
|
|
|
bcs BB.FX2.BootErr
|
|
|
|
|
|
|
|
|
|
|
|
ldy ZP.FX2.iBLKPtr get index pointer
|
|
|
|
|
|
inc ZP.FX2.iBLKPtr bump for next time.
|
|
|
|
|
|
|
|
|
|
|
|
lda (ZP.FX2.iBLKLO),y
|
|
|
|
|
|
sta ZP.BLK.BLKNUM
|
|
|
|
|
|
lda (ZP.FX2.iBLKHI),y high disk addr.
|
|
|
|
|
|
sta ZP.BLK.BLKNUM+1
|
|
|
|
|
|
|
|
|
|
|
|
ora (ZP.FX2.iBLKLO),y if both=0 then done.
|
|
|
|
|
|
bne BB.FX2.LOADSYS branch if more to read.
|
|
|
|
|
|
|
|
|
|
|
|
jmp $2000 go execute kernel code.
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
BB.FX2.ProDOS .DA #$26 $20 = storage type + 6 = "PRODOS" len
|
|
|
|
|
|
.AS "PRODOS"
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
.LIST ON
|
|
|
|
|
|
BB.FX2.Free .EQ $C00-*
|
|
|
|
|
|
.BS BB.FX2.Free
|
|
|
|
|
|
.LIST OFF
|
|
|
|
|
|
.EP
|
|
|
|
|
|
*--------------------------------------
|
|
|
|
|
|
MAN
|
|
|
|
|
|
SAVE usr/src/shared/x.bb.fx2.s
|
|
|
|
|
|
LOAD usr/src/lib/libblkdev.s
|
|
|
|
|
|
ASM
|
