A2osX/ProDOS.FX/ProDOS.S.XDOS.F.txt

NEW
  AUTO 3,1
*--------------------------------------
XDOS.Destroy	jsr XDOS.FindFile		look for file to be destroyed.
				bcs L4B66			  	if error.

				jsr tstopen				is it open ?
				lda totent
				bne L4B64			  	error if open.

				stz reql			 	force proper free count in volume.
				stz reqh			 	(no disk access occurs if already
				jsr tstfrblk			proper)
				bcc L4B39				no errors.

				cmp #MLI.E.VOLFULL	 	was error a full disk ?
				bne L4B66			  	no, report error.

L4B39  			lda d_attr			 	make sure ok to destroy file.
*				and #$80
*				bne L4B45			  	branch if ok to destroy.
				bmi L4B45			  	branch if ok to destroy.

				lda #MLI.E.LOCKED	 	access error
				jsr GP.P8errv

L4B45  			lda devnum			 	last device used.
				jsr twrprot1			test for write protected hardware
				bcs L4B66			  	before going thru deallocation.

				lda d_frst			 	'detree' needs first block address
				sta firstbl
				lda d_frst+1
				sta firstbh
				lda d_stor			 	find out which storage type.
				and #$F0			 	strip off name length.
				cmp #$40			 	is it a seed, sapling or tree ?
				bcc L4B68			  	branch if it is.
				bra L4BCF			  	otherwise, test for directory destroy.

L4B64  			lda #MLI.E.OPEN			file busy error.
L4B66  			sec		 				can't be destroyed
				rts

L4B68  			sta stortyp				destroy a tree file. save storage type.

				ldx #$05

*				lda #$00			 	set 'detree' input variables, must be

L4B6F  			stz stortyp,x		   	in order: deblock, dtree, dsap, dseed.
				dex
				bne L4B6F			  	loop until all zero'd.

				lda #$02			 	this avoids an extra file i/o and pre-
				sta dseed+1				vents destruction of any deleted data.
				inc delflag				don't allow detree to zero index blocks.
				jsr detree				make trees and saplings into seeds.
				dec delflag				reset flag.
				bcs L4B93			  	(de-evolution)

L4B85  			ldx firstbh
				lda firstbl				now deallocate seed.
				jsr XDOS.DeallocAX
				bcs L4B93

				jsr upbmap

L4B93  			pha		 				save possible error code.
				lda #$00			 	update directory to free entry space.
				sta d_stor
				cmp h_fcnt			 	file entry wrap ?
				bne L4BA1			 	branch if no carry adjustment.

				dec h_fcnt+1			take carry from hi byte of file entries.

L4BA1  			dec h_fcnt				mark header with one less file.
				jsr dvcbrev				go update block count in vcb (ignore
				jsr drevise				error, if any) and update dir last.
				tax		 				save possible new error code,
				pla		 				restore possible old error code.
				bcc L4BAF			  	branch if last call succeeded.
				txa		 				last call failed, use it's error code.

L4BAF  			cmp #$01			 	adjust carry accordingly
				rts

dvcbrev			ldx vcbptr			 	update block free count in vcb. point to vcb of correct device.
				lda deblock				get # of blocks recently freed.
				adc VCBs+VCB.FBLK,x
				sta VCBs+VCB.FBLK,x			update current free block count.
				lda deblock+1
				adc VCBs+VCB.FBLK+1,x
				sta VCBs+VCB.FBLK+1,x

				stz VCBs+VCB.BMAPIDX,x			force re-scan from 1st bitmap
			
*			lda #0						?????

				rts

L4BCD  			bcc L4B85			  	branch widened (always taken)

L4BCF  			cmp #$D0			 	is this a directory file ?
				bne L4C1B			  	no, file incompatible.

				jsr fndbmap				make sure a buffer available for bitmap
				bcs L4C1A			  	if error.

				jsr XDOS.ReadGBuf_d_frst	read 1st block of directory into gbuf
				bcs L4C1A

				lda gbuf+37				do any files exist in this directory ?
				ora gbuf+38
				bne L4C1Abis			if so, access error.

L4BF6  			sta gbuf+4			 	make it an invalid subdirectory
				.DO LOWERCASE=1
				jsr XDOS.WriteGBufDir
				.ELSE
				jsr XDOS.WriteGBuf
				.FIN
				bcs L4C1A

L4BFE  			lda gbuf+2			 	get forward link.
				cmp #$01			 	test for null block into carry.
				ldx gbuf+3				get the rest of the block address.
				bne L4C0A			  	branch if not null.
				bcc L4BCD			  	was the low part null as well ?

L4C0A  			jsr XDOS.DeallocAX		free this block.
				bcs L4C1A

				lda gbuf+2
				ldx gbuf+3
				jsr XDOS.ReadGBufAX		read next DIR block (no need to unpack)
				bcc L4BFE			  	loop until all freed

L4C1A  			rts

L4C1Abis		lda #MLI.E.LOCKED	 	access error.
				.HS 2C					BIT ABS
L4C1B  			lda #MLI.E.INCFF	 	file incompatible
				jsr GP.P8errv

fcbused			pha		 				mark fcb as dirty so the directory will be flushed on 'flush'.
				tya		 				save regs.
				pha
				ldy fcbptr

				lda #$80			 	mark fcb as dirty.
				sta FCBs+FCB.DIRTY,y	save it back
				pla		 				and restore regs.
				tay
				pla
				rts
*--------------------------------------
* 'detree' deallocates blocks from tree files. it is assumed that the device has
* been pre-selected and the 'gbuf' may be used.
*
* on entry:
*  stortype = storage type in upper nibble, lower nibble is undisturbed.
*  firstbl & firstbh = first block of file (index or data).
*  deblock = 0
*  dtree = ptr to 1st block with data to be deallocated at tree level.
*  dsap = ptr to 1st block at sapling level.
*  dseed = byte (0-511) position to be zeroed from (inclusive).
*
* on exit:
*  stortype = modified result of storage type (if applicable).
*  firstbl & h = modified if storage type changed.
*  deblock = total number of blocks freed at all levels.
*  dtree, dsap, deseed unchanged.
*
* to trim a tree to a seed file, both dtree and dsap must be zero.
* to go from tree to sapling, dtree alone must be zero.
*--------------------------------------
detree			lda stortyp				which kind of tree ?
				cmp #$20			 	is it a 'seed' ?
				bcc L4C46			  	if yes.

				cmp #$30			 	a sapling ?
				bcc L4C51			  	if yes.

				cmp #$40			 	is it at least a 'tree' ?
				bcc L4C59			  	branch if it is.

				lda #$0C			 	block allocation error.
				jsr GP.SysDeath			P8 system death vector

* seedling file type - make sure first desirable block is the only
* block available in a seedling file.

L4C46  			lda dsap
				ora dtree
				bne L4CC2	

				jmp seedel0

* sapling file type - make sure first desirable block is within the range of
* blocks available in a sapling file

L4C51  			lda dtree				can't have any blocks in this range
				bne L4CC2			  	if so then done

				jmp sapdel0				else go deallocate

L4C59			lda #$80
				sta topdest				for tree top start at end, work backwards.

L4C5E  			jsr drdfrst				read specified first block into gbuf.
				bcs L4CC2			  	return errors.

				ldy topdest				get current pointer to top indexes.
				cpy dtree			  	have enough sapling indexes been
				beq L4CC3			  	deallocated? yes, now deallocate blocks

				ldx #$07				buffer up to 8 sapling index block

L4C6D  			lda gbuf,y				addresses. fetch low block address
				sta dealbufl,x			and save it.
				ora gbuf+$100,y			is it a real block that is allocated?
				beq L4C81			  	branch if phantom block.

				lda gbuf+$100,y			fetch high block address
				sta dealbufh,x			and save it.
				dex		 				decrement and test for dealc buf filled.
				bmi L4C93				branch if 8 addresses fetched.

L4C81  			dey		 				look for end of deallocation limit.
				cpy dtree			  	is this the last position on tree level?
				bne L4C6D			  	if not.

				iny

L4C8A  			stz dealbufl,x		 	fill rest of dealc buffer with null addresses.
				stz dealbufh,x
				dex
				bpl L4C8A

L4C93  			dey		 				decrement to prepare for next time.
				sty topdest				save index.

				ldx #$07

L4C99  			stx dtmpx			  	save index to dealc buf.
				lda dealbufl,x
				sta bloknml
				ora dealbufh,x			finished ?
				beq L4C5E			  	branch if done with this level.

				lda dealbufh,x			complete address with high byte,
				sta bloknml+1
				jsr XDOS.ReadGBuf		read sapling level into gbuf.
				bcs L4CC2			  	return errors.

				jsr dealblk				go free all data indexes in this block
				bcs L4CC2

				jsr XDOS.WriteGBuf		write the flipped index block
				bcs L4CC2

				ldx dtmpx			  	restore index to dealc buff.
				dex		 				are there more to free?
				bpl L4C99			  	branch if so.

				bmi L4C5E			  	branch always to get up to 8 more

L4CC2  			rts		 				sapling block numbers.

L4CC3  			ldy dtree			  	deallocate all sapling blocks greater
				iny		 				than specified block.
				jsr dalblk1				(master index in gbuf)
				bcs L4CC2			  	if errors.

				jsr XDOS.WriteGBuf		write updated master index back to disk.
				bcs L4CC2

				ldy dtree				figure out if tree can become sapling.
				beq L4CEB			  	branch if it can.

				lda gbuf,y			 	otherwise, continue with partial, deallocation of last sapling index.
				ora gbuf+$100,y			is there such a sapling index block ?
				beq L4CC2			  	all done if not.

				lda gbuf,y
				ldx gbuf+$100,y			read in sapling level to be modified.

				jsr XDOS.ReadGBufAX	 	read highest sapling index into gbuf.
				bcc L4CF5

				rts

L4CEB  			jsr shrink				shrink tree to sapling
				bcs L4CC2

sapdel0			jsr drdfrst				read specified sapling level index
				bcs L4CC2			  	into gbuf. branch if error.

L4CF5  			ldy dsap				pointer to last of desirable indexes.
				iny		 				inc to 1st undesirable.
				beq L4D05			  	branch if all are desirable.

				jsr dalblk1				deallocate all indexes above specified.
				bcs L4CC2

				jsr XDOS.WriteGBuf		write out the index block
				bcs L4CC2

L4D05  			ldy dsap			 	prepare to clean up last data block.
				beq L4D1F			  	branch if possibility of making a seed.

L4D0A  			lda gbuf,y			 	fetch low order data block address.
				ora gbuf+$100,y			is it a real block ?
				beq L4CC2			  	if not, then done.

				lda gbuf,y
				ldx gbuf+$100,y

				jsr XDOS.ReadGBufAX	 	go read data block into gbuf.
				bcc L4D2E			  	branch if good read

L4D1E			rts		 				or return error.

L4D1F  			lda dtree			  	are both tree and sap levels zero ?
				bne L4D0A			  	if not.

				jsr shrink				reduce this sap to a seed.
				bcs L4D1E			  	if error.

seedel0			jsr drdfrst				go read data block.
				bcs L4D1E			  	if error.

L4D2E  			ldy dseed+1				check high byte for no deletion.
				beq L4D39			  	branch if all of 2nd page to be deleted.

				dey						if dseed > $200 then all were done.
				bne L4D1E			  	branch if that is the case.

				ldy dseed			  	clear only bytes >= dseed.

L4D39  			lda #$00

L4D3B  			sta gbuf+$100,y			zero out unwanted data
				iny
				bne L4D3B

				ldy dseed+1				is that all ?
				bne L4D4F			  	yes.

				ldy dseed

L4D49  			sta gbuf,y
				iny
				bne L4D49

L4D4F  			jmp XDOS.WriteGBuf		update data block to disk.

L4D52  			rts		 				return error status.

drdfrst			lda firstbl				read specified 1st block into gbuf
				ldx firstbh
				jmp XDOS.ReadGBufAX		go read it

* beware that dealloc may bring in a new bitmap block and may destroy
* locations 46 and 47 which are used to point to the current index block.

shrink			ldx firstbh				first deallocate top index block
				txa
				pha
				lda firstbl
				pha		 				save block address of this index block.
				jsr XDOS.DeallocAX		free it from the bitmap
				pla
				sta bloknml				set master of sapling
				pla						index block address.
				sta bloknml+1
				bcs L4D1E			  	report errors.

				lda gbuf			 	get # of new 1st block from old index.
				sta firstbl
				lda gbuf+$100
				sta firstbh
				ldy #$00
				jsr swapme				flip that one entry in old top index.
				sec		 				now change file type,
				lda stortyp				from tree to sapling,
				sbc #$10			 	or from sapling to seed.
				sta stortyp
				jmp XDOS.WriteGBuf		write the (deallocated) old top index.

dealblk			ldy #$00			 	start at beginning.
dalblk1			lda bloknml				save disk address of gbuf's data.
				pha
				lda bloknml+1
				pha

L4D96  			sty saptr			  	save current index.
				lda gbuf,y			 	get low address of block to deallocate.
				cmp #$01			 	test for null block into carry.
				ldx gbuf+$100,y			get remainder of block address.
				bne L4DA5			  	branch if not null.

				bcc L4DB0			  	was the low part null too ?

L4DA5  			jsr XDOS.DeallocAX		free it up on volume bitmap.
				bcs L4DB4			  	return any error.

				ldy saptr			  	get index to sapling level index block.

				jsr swapme			 

L4DB0  			iny		 				next block address.
				bne L4D96			  	if more to deallocate or test.

				clc		 				no error.
L4DB4  			tax		 				save error code, if any.
				pla		 				restore blocknm (16 bit)
				sta bloknml+1
				pla
				sta bloknml
				txa		 				restore return code
				rts

swapme			lda delflag				swapping or zeroing ?
				bne L4DC5			  	skip if swapping.

				tax		 				make x = 0.
				beq L4DCB			  	zero the index (always taken).

L4DC5  			ldx gbuf+$100,y		   	index high
				lda gbuf,y			 	index low
L4DCB  			sta gbuf+$100,y		   	save index high
				txa
				sta gbuf,y			 	save index low
				rts						done.

* MEMMGR memory manager
*
* allocate buffer in memory tables

alcbuffr 		ldy #$04				index to user specified buffer.
alcbufr1 		lda (A3L),y				this buffer must be on a page boundary.
				tax		 				save for validation.
				cmp #$08
				bcc L4E1E			  	cannot be lower than video !

				cmp #$BC				nor greater than $BB00
				bcs L4E1E			  	since it would wipe out globals...

				sta datptr+1
				dey
				lda (A3L),y				low address should be zero !
				sta datptr
				bne L4E1E			  	error if not page boundary.

				inx		 				add 4 pages for 1k buffer.
				inx
				inx
				inx

L4DED			dex		 				test for conflicts.
				jsr cmembit				test for free buffer space
				and MEMTABL,y			P8 memory bitmap
				bne L4E1E			  	report memory conflict, if any.

				cpx datptr+1			test all 4 pages.
				bne L4DED

				inx		 				add 4 pages again for allocation.
				inx
				inx
				inx

L4DFE  			dex		 				set proper bits to 1
				jsr cmembit
				ora MEMTABL,y			to mark it's allocation.
				sta MEMTABL,y
				cpx datptr+1			set all 4 pages
				bne L4DFE

				ldy fcbptr			 	calculate buffer number
				lda FCBs,y
				asl			  			buffer number = (entnum) * 2.
				sta FCBs+FCB.BUFID,y	save it in fcb.
				tax		 				use entnum * 2 as index to global
				lda datptr+1			buffer addr tables. get addr already
				sta buftbl-1,x			validated as good. store hi addr

				clc		 				(entnums start at 1, not 0)
				rts

L4E1E  			lda #MLI.E.BADBUF	 	buffer is in use or not legal
				sec
				rts
*--------------------------------------
relbuffr 		tax						index into global buffer table.
				lda buftbl-2,x
				sta bufaddrl
				lda buftbl-1,x
				sta bufaddrh
				beq relbuffr.8		 	branch if unallocated buffer space.

				stz buftbl-1,x			take address out of buffer list.
				stz buftbl-2,x			(x was set up by getbufadr)

freebuf			ldx bufaddrh			get hi buffer address
				inx		 				add 4 pages to account for 1k space.
				inx
				inx
				inx

.1  			dex		 				drop to next lower page.
				jsr cmembit				get bit and position to memtable of
				eor #$FF			 	this page. invert mask.
				and MEMTABL,y			mark address as free space.
				sta MEMTABL,y
				cpx bufaddrh			all pages freed ?
				bne .1				  	no.

relbuffr.8 		clc		 				no error.
				rts
*--------------------------------------
* calculate memory allocation bit position.
* on entry: x = high address of buffer, low address assumed zero.
* on exit: acc = allocation bit mask, x = unchanged, y = pointer to memtabl byte
*--------------------------------------
cmembit			txa						page address
				and #$07			 	which page in any 2k set ?
				tay		 				use as index to determine
				lda whichbit,y			bit position representation.
				pha		 				save bit position mask for now.
				txa		 				page address.
				lsr
				lsr			  			determine 2k set
				lsr
				tay		 				return it in y.
				pla		 				restore bit mask. return bit position
				rts		 				in a & y, pointer to memtabl in x.
*--------------------------------------
valdbuf			lda usrbuf+1			high address of user's buffer
				cmp #$02			 	must be greater than page 2.
				bcc L4E1E			  	report bad buffer

				ldx cbytes+1
				lda cbytes			 	get cbytes-1 value.
				sbc #$01			 	(carry is set)
				bcs L4E76

				dex

L4E76  			clc
				adc usrbuf			 	calculate end of request address.
				txa		 				do high address.
				adc usrbuf+1			the final address
				tax		 				must be less than $BFnn (globals)
				cpx #$BF
				bcs L4E1E			  	report bad buffer.

				inx		 				loop thru all affected pages.

vldbuf1			dex		 				check next lower page.
				jsr cmembit
				and MEMTABL,y			if 0 then no conflict.
				bne L4E1E			  	branch if conflict.

				cpx usrbuf+1			was that the last (lowest) page ?
				bne vldbuf1			 	if not.

				clc		 				all pages ok.
				rts
*--------------------------------------
XDOS.GetBuf		ldy #$02			 	give user address of file buffer referenced by refnum.
				lda bufaddrl
				sta (A3L),y
				iny
				lda bufaddrh
				sta (A3L),y
				clc		 				no errors possible
				rts
*--------------------------------------
XDOS.SetBuf		ldy #$03
				jsr alcbufr1			allocate new buffer address over old one
				bcs L4EC7				report any errors immediately

				lda bufaddrh
				sta usrbuf+1
				lda bufaddrl
				sta usrbuf
				jsr freebuf				free address space of old buffer

				ldy #$00
				ldx #$03
				
L4EB8  			lda (usrbuf),y			move all 4 pages of the buffer to
				sta (datptr),y			new location.
				iny
				bne L4EB8

				inc datptr+1
				inc usrbuf+1
				dex
				bpl L4EB8
XDOS.SetBuf.CLCRTS			
				clc		 				no errors
L4EC7  			rts
*--------------------------------------
XDOS.IsValidChar
				cmp #'0'
				bcc XDOS.IsValidFirstChar
				cmp #'9'+1
				bcc XDOS.IsValidFirstChar.RTS
XDOS.IsValidFirstChar
				.DO ENHFILENAME=1
				cmp #'.'
				beq XDOS.SetBuf.CLCRTS
				cmp #'_'
				beq XDOS.SetBuf.CLCRTS
				.FIN
				cmp #'A'
				bcc XDOS.IsValidFirstChar.SEC
				cmp #'Z'+1
				.DO LOWERCASE=1
				bcc XDOS.IsValidFirstChar.RTS
				cmp #'a'
				bcc XDOS.IsValidFirstChar.SEC
				cmp #'z'+1
				.FIN
XDOS.IsValidFirstChar.RTS
				rts				
		
XDOS.IsValidFirstChar.SEC
				sec
				rts
*--------------------------------------
* move 3 pages of dispatcher from 'displc2' to 'dispadr'
* this move routine must be resident above $E000 at all times
*--------------------------------------
calldisp 		lda RRAMWRAMBNK2		read/write RAM bank 2
				lda RRAMWRAMBNK2

				stz A1L
				lda #$D1
				sta A1L+1

				stz A2L
				lda #$10
				sta A2L+1

				ldy #$00
				ldx #$03				3 pages to move.

.1  			lda (A1L),y
				sta (A2L),y
				iny
				bne .1
				
				inc	A1L+1			  	pointers to next page
				inc	A2L+1
				dex		 				move all pages needed
				bne .1

				lda RRAMWRAMBNK1		read/write RAM bank 1
				lda RRAMWRAMBNK1		swap mli space back in

				stz mliact			 	MLI active flag
				
				stz softev			 
				lda #$10				point RESET to dispatch entry
				sta softev+1
				eor #$A5
				sta pwredup				power up byte

				jmp $1000
*--------------------------------------
XDOS.SPREMAP	ldx #$03				assume 3 parameters.
				lda A4L			  		command number
				sta cmdnum
				bne .1					taken if not status call

				ldy #XDOS.SPStatus		set up memory for the status list buffer
				sty buf					fake up the prodos parameters
				ldy /XDOS.SPStatus
				sty buf+1
				stz bloknml				set statcode = 0 for simple status call

.1  			cmp #$03			 	format command ?
				bne .2				  	no.

				ldx #$01			 	format has only 1 parameter.

.2  			stx XDOS.SPParams		set # of parms.

				lda unitnum				DSSS0000
				lsr			  			turn unit number into an index
				lsr
				lsr
				lsr
				tax						range = 1-15

				lda XDOS.SPUnit-1,x		get the smartport unit number and
				sta XDOS.SPParams.U		store into smartport parm list.
				lda XDOS.SPVectLo-1,x	
				sta sp_vector+1			copy smartport entry address
				lda XDOS.SPVectHi-1,x
				sta sp_vector+2

				ldx #$04				copy buffer pointer and block #

.3  			lda buf-1,x				from prodos parameters
				sta XDOS.SPParams.B-1,x		to smartport parameter block
				dex
				bne .3

sp_vector 		jsr $0000				smartport call (entry address gets modified)
cmdnum			.HS 00					command #
				.DA XDOS.SPParams
				bcs	.9

				ldx cmdnum				status call ?
				bne .9				  	no...

				ldx XDOS.SPStatus+1		else get the block count
				ldy XDOS.SPStatus+2
				lda	XDOS.SPStatus		get the returned status.
				bit #$10			 	is there a disk present ?
				beq .8

				and #$44			 	mask all but write allowed and write
				eor #$40			 	protected bits. if allowed and not
*				clc
				beq .9				  	protected, exit with carry clear

				lda #MLI.E.WRTPROT	 	else return write protected error.
				.HS 2C					BIT ABS
.8				lda #MLI.E.OFFLINE		return offline error.
				sec
.9  			rts
*--------------------------------------
XDOS.SPParams	.HS 03					# of parms (always 3 except format)
XDOS.SPParams.U	.HS 00			  		unit number
XDOS.SPParams.B	.HS 0000				data buffer
				.HS 000000				block number (3 bytes)
*--------------------------------------
				.DO XRWDBG=1

XRW.DEBUG.BASE	.EQ $750				

XRW.DEBUG		sta CLRPAGE2

				lda #" "
				sta XRW.DEBUG.BASE+$22

				lda #"R"
				bit XRW.bWrite
				bpl .1

				lda #"W"

.1				sta XRW.DEBUG.BASE+$23

				ldx #$24

				lda XRW.ReqTrack
				jsr XRW.DEBUG.PBYTEx

				lda XRW.ReqSector

XRW.DEBUG.PBYTEx
				pha
				lsr
				lsr
				lsr
				lsr
				jsr .7

				pla

.7				and #$0F
				ora #$B0
				cmp #"9"+1
				bcc .8

				adc #6

.8				sta XRW.DEBUG.BASE,x
				inx
				rts

				.FIN
*--------------------------------------
* data tables
*--------------------------------------
XDOS.CmdNums	.HS D3D4D5D6			table of valid mli command numbers.
				.HS 40410000
				.HS 808182
				.HS 65
				.HS C0C1C2C3C4C5C6C7C8C9CACBCCCDCECF
				.HS 00
				.HS D0D1D2

XDOS.ParamCnt	.HS 02020202			parameter counts for the calls
				.HS 0201FFFF
				.HS 030300
				.HS 04
				.HS 070102070A0201010303040401010202
				.HS FF
				.HS 020202
				
XDOS.CmdFlags	.HS A0A1A2
				.HS A384
				.HS 050607
				.HS 88494A4B
				.HS 2C2D
				.HS 4E4F
				.HS 50515253
				.HS 94959697

cmdtable 		.DA XDOS.Create
				.DA XDOS.Destroy
				.DA XDOS.Rename
				.DA XDOS.SetFileInfo

				.DA XDOS.GetFileInfo
				.DA XDOS.Online
				.DA XDOS.SetPrefix
				.DA XDOS.GetPrefix

				.DA XDOS.Open
				.DA XDOS.NewLine
				.DA XDOS.Read
				.DA XDOS.Write

				.DA XDOS.Close
				.DA XDOS.Flush
				.DA XDOS.SetMark
				.DA XDOS.GetMark

				.DA XDOS.SetEOF
				.DA XDOS.GetEOF
				.DA XDOS.SetBuf
				.DA XDOS.GetBuf

				.DA XDOS.SetFileInfoEx
				.DA XDOS.GetFileInfoEx
				.DA XDOS.ACL

dinctbl			.HS 0100000200			table to increment directory usage/eof counts
				.DO LOWERCASE=1
XDOS.VolHdrDef	.HS C3270D
XDOS.VolHdrDef.Cnt	.EQ *-XDOS.VolHdrDef
				.ELSE
pass			.HS 75
xdosver			.HS 00
compat			.HS 00
				.HS C3270D000000
				.FIN
rootstuf 		.HS 0F02000400000800
whichbit 		.HS 8040201008040201
ofcbtbl			.HS 0C0D1819151617
inftabl			.HS 1E101F2080939421
				.HS 22232418191A1B
deathmsg		.AS -"SYS ERR-$0"
deathmsg.LEN	.EQ *-deathmsg
*--------------------------------------
XDOS.DATA		.DUMMY
*--------------------------------------
own_blk			.HS 0000
own_ent			.HS 00
own_len			.HS 00
*--------------------------------------
				.DO ACL=1
h_acl			.BS 8
				.FIN
h_credt			.HS 0000				directory creation date
				.HS 0000				directory creation time
				.HS 00			 	 	version under which this dir created
				.HS 00			 	 	earliest version that it's compatible
h_attr			.HS 00				 	attributes (protect bit, etc.)
h_entln			.HS 00				 	length of each entry in this directory
h_maxent 		.HS 00				 	maximum number of entries per block
*--------------------------------------
h_fcnt			.HS 0000			 	current # of files in this directory
h_bmap			.HS 0000			 	address of first allocation bitmap
h_tblk			.HS 0000			 	total number of blocks on this unit
*--------------------------------------
d_dev			.HS 00				 	device number of this directory entry
d_head			.HS 0000			 	address of <sub> directory header
d_entblk 		.HS 0000				address of block which contains entry
d_entnum 		.HS 00				 	entry number within block
*--------------------------------------
d_stor			.BS 16				  	file name
d_filid			.HS 00				 	user's identification byte
d_frst			.HS 0000			 	first block of file
d_usage			.HS 0000			 	# of blocks allocated to this file
d_eof			.HS 000000			 	current end of file marker
d_credt			.HS 0000				file creation date
				.HS 0000				file creation time
d_sosver 		.HS 00					sos version that created this file
d_comp			.HS 00				 	backward version compatibility
d_attr			.HS 00				 	attributes (protect, r/w, enable, etc.)
d_auxid			.HS 0000			 	user auxilliary identification
d_moddt			.HS 0000				file's last modification date
				.HS 0000				file's last modification time
d_dhdr			.HS 0000			 	file directory header block address
*--------------------------------------
scrtch			.HS 00000000			scratch area for allocation address conversion.
oldeof			.HS 000000				temp used in r/w
oldmark			.HS 000000
xvcbptr			.HS 00				 	used in 'cmpvcb' as a temp
vcbptr			.HS 00
fcbptr			.HS 00
fcbflg			.HS 00
reql			.HS 00			  
reqh			.HS 00
levels			.HS 00
totent			.HS 00
entcntl			.HS 00
entcnth			.HS 00
cntent			.HS 00
nofree			.HS 00
bmcnt			.HS 00			  
saptr			.HS 00
pathcnt			.HS 00
p_dev			.HS 00
p_blok			.HS 0000
bmptr			.HS 00
basval			.HS 00
half			.HS 00

* bitmap info tables

bmastat			.HS 00
bmadev			.HS 00
bmadadr			.HS 0000
bmacmap			.HS 00
tposll			.HS 00
tposlh			.HS 00
tposhi			.HS 00
rwreql			.HS 00
rwreqh			.HS 00
nlchar			.HS 00
nlmask			.HS 00
ioaccess 		.HS 00			 		has a call been made to disk device handler ?
cmdtemp			.HS 00
bkbitflg		.HS 00					used to set or clear backup bit
duplflag 		.HS 00
vcbentry 		.HS 00

* xdos temporary variables

namcnt			.HS 00
rnptr			.HS 00
namptr			.HS 00
vnptr			.HS 00
prfxflg			.HS 00
cferr			.HS 00

* deallocation temporary variables

firstbl			.HS 00
firstbh			.HS 00
stortyp			.HS 00
deblock			.HS 0000
dtree			.HS 00
dsap			.HS 00
dseed			.HS 0000
topdest			.HS 00
dtmpx			.HS 00
loklst			.EQ	*					look list of recognized device numbers
dealbufl 		.HS 0000000000000000
dealbufh 		.HS 0000000000000000
cbytes			.HS 0000
				.HS 00					cbytes+2 must = 0
bufaddrl		.HS 00			  
bufaddrh 		.HS 00
delflag			.HS 00			  		used by 'detree' to know if called from delete (destroy).
*--------------------------------------
* variables used by SP remap & XRW Disk ][ to store last track used
*--------------------------------------
XRW.D2Trk		.EQ *
XDOS.SPUnit		.HS 00000000000000		14+1 for S0D2
				.HS	00					
				.HS 00000000000000

XRW.D2VolNum	.EQ *
XDOS.SPVectLo	.HS 00000000000000  	storage for low byte of smartport entry.
				.HS 00
				.HS 00000000000000

XRW.D2SeekTime	.EQ *
XDOS.SPVectHi	.HS 00000000000000  	storage for high byte of smartport entry.
				.HS 00
				.HS 00000000000000
				
XDOS.SPStatus	.HS 00000000

				.LIST ON
XDOS.DATA.LEN	.EQ *-XDOS.DATA
				.LIST OFF
				.ED
*--------------------------------------			
* zero fill to page boundary - 3 ($FEFD). so that cortland flag stays within page boundary.
				.LIST ON
XDOS.FREE	.EQ $FEFD-*-XDOS.DATA.LEN	(2.0.3 = $0C)
				.LIST OFF
cortdisp		.EQ $FEFD				
cortflag 		.EQ $FEFF			  		cortland flag. 1 = Cortland system (must stay within page boundary)			
*--------------------------------------
XDOS.LEN		.EQ *-XDOS
MAN
SAVE USR/SRC/PRODOS.FX/PRODOS.S.XDOS.F
LOAD USR/SRC/PRODOS.FX/PRODOS.S
ASM