A2osX/ProDOS.203/ProDOS.S.LDR.B.txt

NEW
  AUTO 3,1

* prodos greeting splash screen

LDR.Splash		lda SPEAKER	  			click speaker
				sta CLR80DISP			disable 80 col hardware
				sta	CLR80STORE			disable 80 col store
				jsr setnorm	 			set normal text mode
				jsr init	  			init text screen
				jsr setvid	  			reset output to screen
				jsr setkbd	  			reset input to keyboard
				cld
				jsr home
				
				ldx #$07
				
.1		 		lda LDR.MSG.AppleII,x
				sta vline10+16,x
				dex
				bpl .1
		 
				ldx #$1D
				
.2	  			lda LDR.MSG.ProDOS,x
				sta vline12+5,x
				dex
				bpl .2
				
				ldx #$0B
				
.3	  			lda H202F,x
				sta vline14+14,x
				dex
				bpl .3
				
				ldx #$26
				
.4	  			lda LDR.MSG.Copyright,x
				sta vline23,x
				dex
				bpl .4
				
				ldx #$13
				
.5	  			lda LDR.MSG.Reserved,x
				sta vline24+10,x
				dex
				bpl .5
				
				sec
				jsr idroutine   		returns system info
				bcs .8					taken if not a //gs
				
				lda #$80
				trb newvideo			video mode select
				
.8	  			lda SPEAKER	  			click speaker
				rts

* find all disk devices in system slots and set up address
* and device table in prodos global page. if there is a disk
* card in slot 2 then limit the # of devices in slot 5
* smartport to only 2

numdev2			.HS 0000000000000000	8 bytes for smartport call
driveradr		.DA	0
d2idx  			.DA #0
diskins2 		.DA #0					msb clear if drive in slot 2

devsrch 		stz dst
				stz dst+1
				stz idxl
				ldx #$FF				init to no active devices.
				stx numdevs	 			count (-1) active devices.
				lda #$0E				start disk // area at end of devlist.
				sta d2idx

* check slot 2. if there is a disk card then clear the msb of diskins2. this
* will limit the # of devices in any slot 5 spartport card to 2.

				lda #$C2
				sta idxl+1				check slot 2
				jsr cmpid				is there a disk in slot 2 ?
				ror diskins2			if so, clear msb else set it.
				lda #$C7	  			search slots from high to low
				sta idxl+1
				
H26AB  			jsr cmpid
				bcs H270C				if no ProDOS device in this slot.
				lda (idxl),y	  		check last byte of $Cn rom (y = $ff)
				beq diskii	   			branch if 16 sector disk II.
				cmp #$FF	   			if = $FF then 13 sector disk II.
				bcs H270C				ignore if 13 sector boot ROM
				sta driveradr	  		else assume it's an intelligent disk.
				ldy #$07	   			check for a smartport device.
				lda (idxl),y
				bne H26C4				no smartport
				jmp smartprt
H26C4  			ldy #$FE
				lda (idxl),y			get attributes.
				and #$03	   			verify it provides read and status calls.
				cmp #$03
				sec						assume it's an off-brand disk
				bne H270C
				jsr setdevid	   		set up the devid byte from attributes
				clc
				php		  				remember that it's not a disk //.
				lsr						move # of units (0=1, 1=2) to carry.
				lda idxl+1	   			store hi entry addr (low already done)
				bne H26E6				branch always.
diskii			sta	devid				=0 since disk ii's have null attributes
				sec
				php		  				remember it's a disk //
				lda H2802
				sta driveradr
				lda H2802+1
H26E6			sta driveradr+1
				jsr installdev			install 1 or 2 devices from this slot.
				plp		  				get back if it's a disk // (carry).
				bcc nxtdsk2	  			if not disk //.
				dex		  				move the list pointer back by 2 devices
				dex
				stx numdevs	  			count (-1) active devices
				dec d2idx				increase the disk two index
				dec d2idx
				ldy d2idx
				inx		  				adj since device count starts with $FF.
				lda devlist+1,x			get entries for disk //
				sta devlist,y	 		move then toward the end of the list
				lda devlist,x	  
				sta devlist+1,y	  
				dex						back to numdevs again
nxtdsk2			clc
H270C  			jsr sltrom				test for ROM in given slot and set flags
				dec idxl+1				next lower slot.
				lda idxl+1
				and #$07	   			have all slots been checked ?
				bne H26AB				no.

* perform the new device search, mapping unmounted smartport devices
* to empty slots in the device table.

				jsr newmount

* now copy the disk // list to the end of the regular list.
* start by making the device count include disk //'s

				ldx numdevs				current device count - 1
				lda #$0E
				sec
				sbc d2idx
				beq H2747				if there were no disk //'s then done.
				clc
				adc numdevs	  			sum of disk //'s and others.
				sta numdevs
				inx						move to open space in regular list.
				ldy #$0D	   			first disk // entry.
H272F  			lda devlist,y
				pha
				lda devlist,x	  
				sta devlist,y	  
				pla
				sta devlist,x	  
				inx
				dey
				sty d2idx				use as a temp
				cpx d2idx
				bcc H272F				continue until indexes cross
H2747  			ldy #$00
				ldx numdevs	  			now change the device order so that
H274C  			lda devlist,x	  		the boot device will have highest
				pha		  				priority.
				and #$7F	   			strip off high bit
				eor devnum	   			for comparison.
				asl
				bne H275A
				pla
				iny
H275A  			dex
				bpl H274C
				ldx numdevs	  			now reverse order of search, hi to lo.
				tya		  				was boot device found ?
				beq H2777
				lda devnum	   			make boot device 1st in search order.
				sta devlist,x
				dex
				bmi H277E				branch if only one device.
				dey		  				is this a 2 drive device ?
				beq H2777				branch if not.
				eor #$80	   			make boot device, drive 2 next.
				sta devlist,x
				dex
				bmi H277E				branch if only 1 device, 2 drives.
H2777			pla
				sta devlist,x
				dex
				bpl H2777
H277E  			jsr fndtrd	   			save accumulated machine id.
				beq H2787
				sta machid	  			machine ID byte
				rts
H2787  			jmp H25B6
stadrv 			ora devid				combine with attributes.
				ldx numdevs	  
				inx		  				put device # into device list.
				sta devlist,x
				asl						now form drive 2 device number, if any.
				rts
sltrom 			bcc H27F3				branch if disk drive

* test for clock card

				ldy #$06
H2799  			lda (idxl),y
				cmp dskid,y
				bne H27BA				no clock
				dey
				dey
				bpl H2799
				lda idxl+1	   			transfer hi slot address
				sbc #$C1	   			minus $C1 (default) to relocate
				sta clock64	  			references to clock rom.
				lda #$4C				enable jump vector in globals.
				sta clockv	   			P8 clock vector.
				lda idapple	 			mark clock as present.
				beq H277E
				ora #$01
				sta idapple				xxxxxxx1 = clock present.
				bne H27F3				always taken.

* test for 80 col card

H27BA  			ldy #$05
				lda (idxl),y
				cmp #$38
				bne H27E4
				ldy #$07
				lda (idxl),y
				cmp #$18
				bne H27E4
				ldy #$0B
				lda (idxl),y
				dec 		must = 1
				bne H27E4
				iny
				lda (idxl),y
				and #$F0	   			mask off low nibble.
				cmp #$80	   			generic for 80-col card.
				bne H27E4
				lda idapple
				beq H277E
				ora #$02
				sta idapple				xxxxxx1x = 80 col card.
				bne H27F3				always taken.

* test for any other rom

H27E4  			ldx #$00
				lda (idxl)
				cmp #$FF	   			apple /// non-slot?
				beq H2801				invalid rom
H27EC  			cmp (idxl)				look for floating bus
				bne H2801				no rom
				inx
				bne H27EC
H27F3  			lda idxl+1				mark a bit in slot byte
				and #$07	   			to indicate rom present.
				tax
				lda sltbit,x
				ora rommap	   			mark bit to flag rom present
				sta rommap	   			slot ROM bit map
H2801  			rts

H2802	 		.DA rwts	 			disk ii driver

* id bytes: evens for clock, odds for disk

dskid	 		.HS 082028005803703C

* slot bits
	 	
sltbit			.HS 0002040810204080

fndtrd			clc
				ldy sltbit
H2818  			lda (lookptr),y
				and #$DF
				adc sltbit
				sta sltbit
				rol sltbit
				iny
				cpy sltbit+3
				bne H2818
				tya
				asl
				asl
				asl
				asl
				tay
				eor sltbit
				adc #$0B
				bne H283B
				lda idapple
				rts

H283B  			lda #$00
				rts

installdev 		php						how many drives (carry).
				lda idxl+1	   			get index to global device table
				and #$07	  			for this slot...
				asl
				tay		  				into y reg.
				asl
				asl						now form device # = slot #
				asl						in high nibble.
				jsr stadrv				OR in low nibble, store in dev list.
				plp						restore # of devices in carry.
				ror						if 2 drives, then bit 7=1.
				bpl H2853				branch if a 1 drive device (e.g. hard drive)
				inx		  				else presume that 2nd drive is present.
				sta devlist,x	  		active device list.

H2853  			stx numdevs	  			save updated device count.
				asl						shift # of drives back into carry.
				lda driveradr			get high address of device driver.
				sta drivertbl1,y	 	device driver table 1.
				bcc H2862				branch if single drive.
				sta drivertbl2,y	 	device driver table 2.

H2862  			lda driveradr+1
				sta drivertbl1+1,y
				bcc H286D
				sta drivertbl2+1,y

H286D  			rts

* query smartport status to determine # of devices
* and install up to 4 units in table if card is in slot 5
* otherwise only 2 units. this includes a patch #74

smartprt 		jsr setdevid			setup the devid byte from attributes
				lda idxl+1
				sta driveradr+1
				lda driveradr
				sta pscall+1			modify operand
				clc
				adc #$03
				sta spvect+1
				lda driveradr+1
				sta spvect+2
				sta pscall+2			modify operand
				asl		convert $Cn to $n0
				asl
				asl
				asl
				sta unitnum	  			unit number
				stz A4L					force a prodos status call
				stz buf					dummy pointer
				stz bloknml	  			# of bytes to transfer
				stz bloknml+1
				lda #$10
				sta buf+1				dummy pointer should be <> 0

* do a prodos status call patched in from above

pscall			jsr	$0000				self modifying code
				ldy #$FB	
				lda (idxl),y			check device id
				and #$02	   			SCSI?
				beq H28B1				no, no need to init Cocoon
				sta statunit	   		device = 2 for SCSI

* initialize SCSI Cocoon to build internal device tables
* and report true # of devices attached

				jsr spvect				status of Cocoon
				.HS 00
				.DA spcparms	 		ignore any errors.
H28B1  			stz statunit	   		set unit# = 0
				jsr spvect	   			call to get the device count.
				.HS 00					this is a status call
				.DA spcparms
				lda numdev2
				beq donesp				no devices, so done.
				cmp #$02				carry set if 2,3,4
				jsr installdev			do the 1st and 2nd device if exists.
				lda idxl+1
				cmp #$C5
				bne donesp				if not slot 5

* for slot 5, if there is a disk card in slot 2
* then only install 2 devices otherwise map
* extra devices as slot 2

				bit diskins2			disk in slot 2 ?
				bpl donesp	   			yes - so done
				lda numdev2
				cmp #$03				carry set if 3,4,...
				bcc donesp
				cmp #$04	   			carry set if 4,5,6,...
				lda #$C2				map extra devices as slot 2
				sta idxl+1
				jsr installdev
				lda #$C5
				sta idxl+1
donesp			jmp nxtdsk2				it's a disk device.
setdevid 		ldy #$FE				check attributes byte.
H28E8  			lda (idxl),y
				lsr						move hi nibble to lo nibble for
				lsr						device table entries.
				lsr
				lsr
				sta devid
				rts

* check unknown card to see if disk id = $Cn00:nn 20 nn 00 nn 03

cmpid  			lda CLRC8ROM	   		switch out $C8 ROMs
				ldy #$05
H28F6  			lda (idxl),y	   		compare id bytes
				cmp dskid,y
				sec		  				set if no disk card
				bne H2903
				dey
				dey
				bpl H28F6				loop until all 4 id bytes match.
				clc						clear if disk card
H2903  			rts

* smartport call parameters

spcparms		.DA #$03				# of parms
statunit		.DA #$00				unit number (code for smartport stat)
				.DA numdev2
				.DA #00	 				status code (0 = general status)

* indexes into driver table

driveridx   	.DA #$06				s3, d1
				.DA #$1E 				s7, d2
				.DA #$0E	 			s7, d1
				.DA #$1C	 			s6, d2
				.DA #$0C				s6, d1
				.DA #$1A   				s5, d2
				.DA #$0A	 			s5, d1
				.DA #$14	 			s2, d2
				.DA #$04	 			s2, d1
				.DA #$12	 			s1, d2
				.DA #$02	 			s1, d1
				.DA #$18	 			s4, d2
				.DA #$08	 			s4, d1

* self modifying jmp = smartport entry address

spvect 			jmp	$0000				self modifying
newmount 		stz idxl
				lda #$C7				start with slot 7 ($C700)
				sta idxl+1
H291F  			jsr H29EB				is there a smartport device here?
				bcs H2974				no, next device.
				ldy #$FF	   			get smartport address.
				lda (idxl),y
				clc
				adc #$03				add 3 for smartport call
				sta spvect+1
				lda idxl+1
				sta spvect+2
				dey
				jsr H28E8				set up device attributes
				stz statunit
				jsr spvect				do a status call on smartport itself
				.HS 00
				.DA spcparms
				lda numdev2				# of devices on smartport
				cmp #$03
				bcc H2974				only 2 devices,skip to next one.
				inc						add 1 for comparisons.
				sta driveradr	  		# of devices + 1.
				lda #$03	   			start at unit #3 (non-slot 5)
				ldx spvect+2
				cpx #$C5	   			is this slot 5?
				bne H295B				no, start at 3.
				bit diskins2	   		disk controller in slot 2?
				bpl H295B				yes, so allow remapping of s5 devices
				lda #$05	   			else start looking at unit #5

* find block devices on this smartport

H295B  			cmp driveradr	  		have we done all units in this slot?
				bcs H2974				yes, skip to next slot.
				sta statunit	   		store the unit#.
				jsr spvect	   			do status call
				.HS 00
				.DA spcparms
				lda numdev2	  			is this a block device?
				bmi mount				yes, so mount it.
H296E  			lda statunit	  		go check the next unit#
				inc
				bra H295B
H2974  			dec idxl+1
				lda idxl+1
				cmp #$C0				searched down to slot 0?
				bne H291F				if not.
				rts
mount  			ldx #$0C
H297F  			ldy driveridx,x
				lda drivertbl1,y	 	device driver table 1
				cmp #nodevice
				bne H2990
				lda drivertbl1+1,y
				cmp /nodevice
				beq H2994
H2990  			dex
				bpl H297F
				rts						ran out of space for devices, exit.

* empty slot found

H2994  			lda idxl+1
				pha
				phx
				phy
				tya						which slot is empty?
				lsr 					shift into slot#
				and #$07	   			now 1-7
				ora #$C0	   			now $C1-$C7
				sta idxl+1
				jsr H29EB				smartport interface in this slot?
				ply
				plx
				pla
				sta idxl+1
				bcc H2990				yes, can't use to mirror the device.
				jsr lc1in				write enable LC ram bank 1.
				tya		  				divide index by 2
				lsr
				tax
				lda statunit
				sta spunit-1,x			store the smartport unit #
				lda spvect+1	  		and entry address.
				sta spvectlo-1,x
				lda spvect+2
				sta spvecthi-1,x
				lda RROMBNK2			write protect lc ram.
				inc numdevs
				ldx numdevs
				tya
				lsr
				cmp #$08
				bcc nodev2				drive 2 mount
				sbc #$08
				ora #$08
nodev2 			asl
				asl
				asl
				asl
				ora devid				include device attributes
				sta devlist,x	  		in the active device list.
				lda #remap_sp
				sta drivertbl1,y	 	device driver table 1
				lda /remap_sp
				sta drivertbl1+1,y
				bra H296E
H29EB  			jsr cmpid				is it a disk controller?
				bcs H29F8				no, so return.
				sec		  				assume no smartport
				ldy #$07
				lda (idxl),y			is it a smartport?
				bne H29F8				if not.
				clc						smartport found
H29F8  			rts

* relocation subroutine. on entry, regs yx = address of parameter table
* with the following parameters:
*
* (1) command: 0 = zero destination range
*	  1 = move data from src to dst
*	  2 = hi addr ref tbl, relocate and move
*	  3 = lo/hi addr ref tbl, relocate and move
*	  4 = program, relocate and move
*	 >4 = end of sequence of commands
* (2) destination
* (2) length
* (2) source
* (1) # of address ranges (n) to be relocated
* (n+1) list of low page addresses to be relocated
* (n+1) list of high page addresses to be relocated
* (n+1) list of offset amounts to be added to be added
*   if low and high limits have not been met
*
* on exit, carry set if error and yx = addr of error
*  with acc = $00 for table error or $FF if illegal opcode

reloc  			stx idxl				save address of control table
				sty idxl+1
rloop  			lda (idxl)				get relocation command.
				cmp #$05
				bcs rlend				taken if >= 5 then done.
				tax						move destination to page 0
				ldy #$01	   			for indirect access.
				lda (idxl),y
				sta dst
				iny
				lda (idxl),y
				sta dst+1
				iny
				lda (idxl),y			also the length (byte count)
				sta cnt					of the destination area.
				iny
				lda (idxl),y
				sta cnt+1
				bmi rlerr				branch if >= 32k.
				txa		  				is it a request to zero destination?
				beq zero				if yes.
				iny
				lda (idxl),y			get source address.
				sta src					used for move.
				sta cde					used for relocation
				iny
				clc
				adc cnt					add length to get final address
				sta ecde
				lda (idxl),y
				sta src+1
				sta cde+1
				adc cnt+1
				sta ecde+1
				dex						test for 'move' command
				beq H2AA3				branch if move only (no relocation)
				stx wsize				save element size (1,2,3)
				iny
				lda (idxl),y	   		get # of ranges that are valid
				sta sgcnt				relocation target addresses.
				tax		  				separate serial range groups into tbls
H2A42  			iny
				lda (idxl),y			transfer low limits to 'limlo' table
				sta limlo,x
				dex
				bpl H2A42
				ldx sgcnt				# of ranges
H2A4E  			iny
				lda (idxl),y			transfer high limits to 'limhi' table
				sta limhi,x
				dex
				bpl H2A4E
				ldx sgcnt				# of ranges
H2A5A  			iny
				lda (idxl),y			transfer offsets to 'ofset' table
				sta ofset,x
				dex
				bpl H2A5A
				jsr adjtbl				adj index pointer to next entry.
				ldx wsize				test for machine code relocation
				cpx #$03
				beq rlcode	   			branch if program relocation
				jsr reladr	   			otherwise, relocate addresses in
H2A70  			jsr moveSrcDst	   		tables then move to destination.
				bra rloop				do next table
rlend  			clc
				rts
rlerr  			jmp tblerr
rlcode			jsr rlprog				relocate machine code refs
				bra H2A70

* fill destination range with 0's

zero			jsr adjtbl				adj table pointer to next entry.
				lda #$00
				ldy cnt+1				is it at least 1 page?
				beq H2A94				branch if not.
				tay
H2A89  			sta (dst),y
				iny
				bne H2A89
				inc dst+1				next page
				dec cnt+1
				bne H2A89				if more pages to clear.
H2A94  			ldy cnt					any bytes left to 0?
				beq H2AA0				if not.
				tay
H2A99  			sta (dst),y	  			zero out remainder
				iny
				cpy cnt
				bcc H2A99
H2AA0  			jmp rloop
H2AA3  			jsr adjtbl
				bra H2A70
adjtbl 			tya						add previous table length to
				sec		  				get next entry position in table
				adc idxl
				sta idxl
				bcc H2AB2
				inc idxl+1
H2AB2  			rts
moveSrcDst		lda src+1				is move up, down or not at all?
				cmp dst+1
				bcc movup
				bne movdn
				lda src
				cmp dst
				bcc movup
				bne movdn
				rts						no move.
movup  			ldy cnt+1				calc highest page to move up
				tya		  				and adj src and dst.
				clc
				adc src+1
				sta src+1
				tya
				clc
				adc dst+1
				sta dst+1
				ldy cnt					move partial page 1st.
				beq H2ADE				taken if no partial pages
H2AD6  			dey
				lda (src),y
				sta (dst),y
				tya						end of page transfer?
				bne H2AD6				no
H2ADE  			dec dst+1
				dec src+1
				dec cnt+1				done with all pages?
				bpl H2AD6				no
				rts
movdn  			ldy #$00
				lda cnt+1				partial page move only?
				beq H2AFC				taken if < 1 page to move
H2AED  			lda (src),y
				sta (dst),y
				iny
				bne H2AED
				inc dst+1				next page
				inc src+1
				dec cnt+1				more pages?
				bne H2AED				if more.
H2AFC			lda cnt					move partial page.
				beq H2B09				if no more to move
H2B00  			lda (src),y
				sta (dst),y
				iny
				cpy cnt
				bne H2B00
H2B09  			rts

* relocate addresses

reladr 			ldy wsize				1 or 2 byte reference
				dey
				lda (cde),y
				jsr adjadr				relocate reference.
				lda wsize				update and test code pointer.
				jsr adjcde
				bcc reladr				if more to do
				rts
rlprog			ldy #$00				get next opcode
				lda (cde),y
				jsr oplen				determine if a 3 byte instruction.
				beq rperr				branch if not an opcode
				cmp #$03
				bne H2B30
				ldy #$02
				jsr adjadr				relocate address
				lda #$03
H2B30  			jsr adjcde				update and test if done.
				bcc rlprog	   			if more to do
				rts
rperr  			pla
				pla
				ldx cde					bad code address in y,x
				ldy cde+1
				lda #$FF	   			indicates bad opcode
				sec
				rts
tblerr 			ldx idxl				bad table address in y,x
				ldy idxl+1
				lda #$00	   			indicates input table error
				sec
				rts
adjadr 			lda (cde),y				get page address and
				ldx sgcnt				test against limits.
H2B4D  			cmp limlo,x	  			is it >= low?
				bcc H2B59				if not.
				cmp limhi,x	  			is it <= high?
				bcc H2B5D				branch if it is
				beq H2B5D
H2B59  			dex		  				try next limit set
				bpl H2B4D
				rts		  				return w/o adjustment.
H2B5D  			clc		  				add offset to form relocated
				adc ofset,x	  			page address and replace
				sta (cde),y	  			old address with result.
				rts
adjcde 			clc		  				update code pointer
				adc cde
				ldy cde+1
				bcc H2B6C				branch if not page cross
				iny		  				otherwise, update page#.
H2B6C  			cpy ecde+1	   			has all code/data been processed?
				bcc H2B72				if not.
				cmp ecde
H2B72  			sta cde					save updated values.
				sty cde+1
				rts		  				return result (carry set = done).
oplen  			pha						form index to tbl & which 2-bit group.
				and #$03	   			low 2 bits specify group
				tay
				pla
				lsr						upper 6 bits specify byte in table
				lsr
				tax
				lda opcodln,x
nxgroup  		dey						is opcode len in lowest 2 bits of acc?
				bmi H2B89				branch if it is
				lsr						shift to next group.
				lsr						(if length = 0 then error)
				bne nxgroup

			.BS $2B89-*

H2B89  			and #$03
				rts		  if z-set then error

* relocation table contains length of each opcode in 2-bit groups

opcodln   		.HS 0928193C0A280D3C
				.HS 0B2A193F0A280D3C
				.HS 0928193F0A280D3C
				.HS 0928193F0A280D3C
				.HS 082A113F0A2A1D0C
				.HS 2A2A193F0A2A1D3F
				.HS 0A2A193F0A280D3C
				.HS 0A2A193F0A280D3C

wsize	 		.HS 00
sgcnt	 		.HS 00
limlo	 		.HS 0000000000000000
limhi	 		.HS 0000000000000000
ofset	 		.HS 0000000000000000

* patch to gsos vectors so error is returned for os calls - rev note #101

patch101 		php
				sei						disable interrupts
				clc
				xce		  				full native mode
				>LONGMX
				phb		  				save DBR
				pha
				pha
				pea $0000				length of patch
				pea $0010				0000/0010 = 16 bytes
				pea $3101				user id for prodos 8
				pea $8018				attributes (locked/nospec/nocross)
				pha
				pha
				>IIGS NewHandle
				lda $01,s				retrieve handle
				tax
				lda $03,s
				tay
				pea $0000				copy the code into the handle
				pea L2C4D
				phy
				phx
				pea $0000				length of patch = 0000/0010
				pea $0010
				>IIGS PtrToHand
				plx		  				low word of handle
				plb		  				set DBR to handle's bank
				lda	>1,x				get upper 16 bits of 24 bit address
				tay		  				save in y
				lda	>0,x				get low 8 bits of address
				and ##$00FF	   			clear high byte
				xba		  				put address in high byte
				ora ##$005C	   			include JML opcode
				sta GSOS2	   			store in gsos vectors
				clc
				adc ##$000B
				sta GSOS
				tya						store upper 16 bits too
				sta GSOS2+2
				adc ##$0000	   			adj for possible page crossing
				sta GSOS+2
				plb						remove garbage byte from stack
				plb		  				restore DBR.
				sec
				xce		  				back to emulation mode
				plp
				rts

* copy of the code that goes in the handle

L2C4D			lda 1,s
				sta 7,s
				lda 2,s
				sta 8,s
				pla
				pla
				pla
				lda ##$00FF				#NoOS
				sec
				rtl

				.BS $2C80-*

RAMDRV.Install	ldy #$99				move $9A bytesfrom lcsrc to lcdest.

.1	  			lda	RAM,y				transfer main bank portion of driver
				sta RAMDRV,y					
				dey
				cpy #$FF
				bne	.1
				
				ldx	#RAMX				set up to move aux portion of driver
				stx	A1L
				dex
				stx	A2L
				ldx	/RAMX
				stx A1L+1
				inx
				stx A2L+1
				lda #RAMXDRV
				sta	A4L
				lda	/RAMXDRV			RAMX to RAMXDRV
				sta	A4L+1
				sec			 			irection = to aux bank.
				jsr auxmove				move aux bank portion of driver.
				
				lda #RAMDRV				put driver address into
				sta	drivertbl2+6		slot 3, drive 2.
				lda /RAMDRV
				sta	drivertbl2+7
				
				inc numdevs				count (-1) active devices
				ldx numdevs
				lda #$BF				unit num of /RAM
				sta	devlist,x
				rts	end of obj ram_1

RAM_1_END		.EQ	*					end of /RAM installer
				.BS $2D00-*				pad 0's to page boundary


MAN
SAVE usr/src/prodos.203/prodos.s.ldr.b
LOAD usr/src/prodos.203/prodos.s
ASM