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https://github.com/A2osX/A2osX.git
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Kernel 0.94
This commit is contained in:
Rémy GIBERT
parent
3c7188a189
commit
6eaa0718ba
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@ -47,10 +47,6 @@ L59BD jsr XRW.AllPhasesOff make sure all motor phases are off
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nop
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nop
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lda A4L command #.
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cmp #$04 is the command allowed ?
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bcs XRW.E.IO if not.
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lda bloknml
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ldx bloknml+1
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stx XRW.ReqTrack calculate block's track and sector.
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@ -100,21 +96,10 @@ L5362 lda IO.D2.DrvSel1,x
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.1 jsr XRW.Wait100usecA
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dey
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bne .1
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php
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php now zero flag set.
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L5372
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* lda A4L make sure this command needs seeking.
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* beq L537C branch if status check.
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* lda XRW.ReqTrack get destination track
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* jsr XRW.Seek and go to it.
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* now at desired track. was the motor already on ?
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*L537C
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plp was motor on ?
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bne L538E if so, don't wait.
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L5372 plp
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* motor was off, wait for it to speed up
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@ -128,16 +113,32 @@ L537F lda #1
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* if it looks stopped then the drive is not present
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jsr XRW.CheckMotorOn is drive present ?
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beq hndlerr branch if no drive
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beq XRW.E.ND
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* now check: if it is not the status disk command,
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* locate the correct sector for this operation
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L538E lda A4L get command #
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beq XRW.TestWP if 0 then status command
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bne .1
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jsr XRW.TestWP 0 = status
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bcs XRW.E.WP
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lda #0
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bra XRW.E.OK
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.1 cmp #4 3 = format
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bcs XRW.E.IO
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cmp #2 Write ?
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bne .2
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jsr XRW.TestWP
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bcs XRW.E.WP
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*--------------------------------------
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.2 lda A4L get command #
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jsr regrwts
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bcs .3 if error
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bcs XRW.E.IO
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inc buf+1
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@ -146,12 +147,22 @@ L538E lda A4L get command #
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lda A4L get command #
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jsr regrwts get 2nd half of block
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dec buf+1
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.3 rts
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bcs XRW.E.IO
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XRW.E.OK bit IO.D2.DrvOff,x turn off
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lda #0
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rts
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XRW.E.IO lda #MLI.E.IO
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.HS 2C BIT ABS
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XRW.E.WP lda #MLI.E.WRTPROT
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.HS 2C BIT ABS
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XRW.E.ND lda #MLI.E.NODEV
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bit IO.D2.DrvOff,x turn off
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sec
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rts
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*--------------------------------------
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@ -159,22 +170,22 @@ regrwts ldy #1
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sty XRW.RecalibrateCnt
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lsr set carry = 1 for read, 0 for write.
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bcs L5398 must prenibblize for write
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bcs .1 must prenibblize for write
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jsr XRW.PreNibble
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*--------------------------------------
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L5398 ldy #64
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.1 ldy #64
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sty XRW.RetryCnt
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L539D jsr XRW.ReadAddr read next address field.
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bcc L53BE if CC A = current track
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.2 jsr XRW.ReadAddr read next address field.
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bcc .4 if CC, A = current track
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L53A4 dec XRW.RetryCnt one less chance.
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bne L539D branch to retry.
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.3 dec XRW.RetryCnt one less chance.
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bne .2 branch to retry.
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XRW.Recalibrate lda #MLI.E.IO anticipate a bad drive error.
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dec XRW.RecalibrateCnt
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bmi hndlerr
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sec
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bmi .9
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jsr XRW.DEBUG
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@ -187,46 +198,30 @@ XRW.Recalibrate lda #MLI.E.IO anticipate a bad drive error.
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sta XRW.D2VolNum-1,y
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jsr XRW.Seek
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bra L5398
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bra .1
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L53BE cmp XRW.ReqTrack
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beq L53D5
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.4 cmp XRW.ReqTrack
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beq .5
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lda XRW.ReqTrack
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jsr XRW.Seek
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bra L5398
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*--------------------------------------
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L53D5 lda XRW.AddrField.S is this the right sector ?
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bra .1
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.5 lda XRW.AddrField.S is this the right sector ?
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cmp XRW.ReqSector
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bne L53A4 no, try another sector.
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bne .3 no, try another sector.
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lda A4L read or write ?
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lsr the carry will tell.
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bcc L53F4 branch if write
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jsr XRW.Read
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bcs L53A4 if bad read
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bcs .3 if bad read
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L53E7 lda #$00
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.HS D0 bne branch never taken (skip 1 byte)
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hndlerr sec
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ldx A2L slot offset
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bit IO.D2.DrvOff,x turn off
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rts
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*--------------------------------------
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XRW.TestWP ldx A2L
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lda IO.D2.ReadProt,x test for write protected
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lda IO.D2.ReadMode,x
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rol write protect-->carry-->bit 0=1
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lda IO.D2.RData,x keep in read mode
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bra statdne
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.9 rts
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L53F4 jsr XRW.Write
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statdne bcc L53E7 if no errors.
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lda #MLI.E.WRTPROT disk write protected.
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bne hndlerr always
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L53F4 jmp XRW.Write
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*--------------------------------------
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* determine if motor is stopped
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*
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@ -253,6 +248,13 @@ XRW.CheckMotorOnX
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.9 rts
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*--------------------------------------
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XRW.TestWP ldx A2L
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lda IO.D2.ReadProt,x test for write protected
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lda IO.D2.ReadMode,x
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rol write protect-->carry-->bit 0=1
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lda IO.D2.RData,x keep in read mode
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rts
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*--------------------------------------
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* preniblize subroutine (16 sector format)
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*
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* converts 256 bytes of user data in (buf) into 6 bit nibls in nbuf2.
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@ -384,17 +386,7 @@ L596F ldy #$FF index to last byte of data to write.
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* on exit: carry set if error (write protect violation).
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* if no error, acc=uncertain, x=unchanged, y=0, carry clear.
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*--------------------------------------
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XRW.Write sec anticipate write protect error
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lda IO.D2.ReadProt,x
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lda IO.D2.ReadMode,x sense write protect flag
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bpl .1
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jmp wexit exit if write protected
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* timing is critical. a one micro-second cycle time is assumed.
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* number in () is how many micro-seconds per instruction or subroutine
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.1 lda nbuf2
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XRW.Write lda nbuf2
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sta pcl
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lda #$FF sync data.
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@ -807,17 +799,6 @@ XRW.Trk2Qtrk asl x2
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.1 adc #$ff SELF MODIFIED
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rts
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*--------------------------------------
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* read address field subroutine (16-sector format)
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*
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* reads volume, track and sector.
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* on entry: x = slot# times $10, read mode
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* on exit: carry set if error, else if no error:
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* acc=$AA, y=0, x=unchanged, carry clear,
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* ccstv contains chksum,sector,track & volume read.
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* uses temps: count,last,csum & 4 bytes at ccstv
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* expects: original 10-sector normal density nibls (4-bit) odd bits then even.
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* observe 'no page cross' warnings on some branches !!!
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*--------------------------------------
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XRW.ReadAddr ldy #$FC
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sty XRW.CheckSum init nibble counter to $FCFC
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@ -874,12 +855,6 @@ L56D2 lda IO.D2.RData,x read 'even bit' nibl
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tay if final checksum non-zero,
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bne rderr then error.
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*L56E6 lda IO.D2.RData,x first bit-slip nibl
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* bpl L56E6 *** no page cross ***
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* cmp #$DE
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* bne rderr
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ldy XRW.UnitIndex Succesfull REad, update Drive table
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lda XRW.AddrField.V
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