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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm@ 532

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Last change on this file since 532 was 526, checked in by krille_n_@…, 12 years ago

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Update of the copyright notices to include the year 2013.

File size: 15.9 KB

Rev	Line
[90]	1	; Project name : XTIDE Universal BIOS
[3]	2	; Description : Int 13h BIOS functions (Floppy and Hard disk).
	3
[376]	4	;
[445]	5	; XTIDE Universal BIOS and Associated Tools
[526]	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
[376]	7	;
	8	; This program is free software; you can redistribute it and/or modify
	9	; it under the terms of the GNU General Public License as published by
	10	; the Free Software Foundation; either version 2 of the License, or
	11	; (at your option) any later version.
[445]	12	;
[376]	13	; This program is distributed in the hope that it will be useful,
	14	; but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
[445]	16	; GNU General Public License for more details.
[376]	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
[445]	18	;
[376]	19
[3]	20	; Section containing code
	21	SECTION .text
	22
	23	;--------------------------------------------------------------------
	24	; Int 13h software interrupt handler.
[417]	25	; This handler changes stack to top of stolen conventional memory
	26	; and then calls the actual INT 13h handler (Int13h_DiskFunctionsHandler).
	27	;
	28	; Int13h_DiskFunctionsHandlerWithStackChange
	29	; Parameters:
	30	; AH: Bios function
	31	; DL: Drive number
	32	; Other: Depends on function
	33	; Returns:
	34	; Depends on function
	35	;--------------------------------------------------------------------
	36	%ifdef RELOCATE_INT13H_STACK
	37	ALIGN JUMP_ALIGN
	38	Int13h_DiskFunctionsHandlerWithStackChange:
[525]	39	sti ; Enable interrupts
	40	; TODO: Maybe we need to save Flags (DF) as well?
	41	push ds ; Save DS:DI on the original stack
[417]	42	push di
	43	call RamVars_GetSegmentToDS
	44
	45	; Store entry registers to RAMVARS
[525]	46	%ifdef USE_386
	47	pop DWORD [RAMVARS.dwStackChangeDSDI]
	48	%else
	49	pop WORD [RAMVARS.wStackChangeDI] ; Pop DS:DI to the top of what
	50	pop WORD [RAMVARS.wStackChangeDS] ; is to become the new stack
	51	%endif
[417]	52	mov [RAMVARS.fpInt13hEntryStack], sp
	53	mov [RAMVARS.fpInt13hEntryStack+2], ss
	54
	55	; Load new stack and restore DS and DI
[525]	56	mov di, ds ; We can save 2 bytes by using PUSH/POP but it's slower
	57	mov ss, di ; No need to wrap with CLI/STI since this is for AT only (286+)
	58	mov sp, RAMVARS.rgbTopOfStack-4
	59	pop di ; DI before stack change
	60	pop ds ; DS before stack change
[417]	61
	62	; Call INT 13h
	63	pushf
	64	push cs
	65	call Int13h_DiskFunctionsHandler
	66
	67	; Restore stack (we must not corrupt FLAGS!)
	68	%ifdef USE_386
	69	lss sp, [ss:RAMVARS.fpInt13hEntryStack]
	70	%else
[525]	71	cli
[417]	72	mov sp, [ss:RAMVARS.fpInt13hEntryStack]
	73	mov ss, [ss:RAMVARS.fpInt13hEntryStack+2]
[525]	74	sti
[417]	75	%endif
	76	retf 2 ; Skip FLAGS from stack
	77	%endif ; RELOCATE_INT13H_STACK
	78
	79
	80	;--------------------------------------------------------------------
	81	; Int 13h software interrupt handler.
[3]	82	; Jumps to specific function defined in AH.
	83	;
[148]	84	; Note to developers: Do not make recursive INT 13h calls!
	85	;
	86	; Int13h_DiskFunctionsHandler
[3]	87	; Parameters:
	88	; AH: Bios function
	89	; DL: Drive number
[148]	90	; Other: Depends on function
[3]	91	; Returns:
	92	; Depends on function
	93	;--------------------------------------------------------------------
	94	ALIGN JUMP_ALIGN
[148]	95	Int13h_DiskFunctionsHandler:
[525]	96	%ifndef RELOCATE_INT13H_STACK
[3]	97	sti ; Enable interrupts
[525]	98	%endif
[150]	99	cld ; String instructions to increment pointers
[443]	100	CREATE_FRAME_INTPACK_TO_SSBP SIZE_OF_IDEPACK_WITHOUT_INTPACK
[3]	101	call RamVars_GetSegmentToDS
[294]	102
[493]	103	%ifdef MODULE_DRIVEXLATE
[148]	104	call DriveXlate_ToOrBack
[414]	105	mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl
[395]	106	%endif
[322]	107	call FindDPT_ForDriveNumberInDL ; DS:DI points to our DPT, or NULL if not our drive
	108	jc SHORT .NotOurDrive ; DPT not found so this is not one of our drives
[258]	109
[294]	110	.OurFunction:
[3]	111	; Jump to correct BIOS function
[148]	112	eMOVZX bx, ah
[445]	113	eSHL_IM bx, 1
[165]	114	cmp ah, 25h ; Possible EBIOS function?
[417]	115	%ifndef MODULE_EBIOS
	116	ja SHORT UnsupportedFunction
	117	jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
	118
	119	%else ; If using MODULE_EBIOS
[165]	120	ja SHORT .JumpToEbiosFunction
[148]	121	jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
[3]	122
[165]	123	ALIGN JUMP_ALIGN
	124	.JumpToEbiosFunction:
[421]	125	test BYTE [di+DPT.bFlagsLow], FLGL_DPT_LBA_AND_EBIOS_SUPPORTED
[417]	126	jz SHORT UnsupportedFunction ; No eINT 13h for CHS drives
[322]	127	sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table
[417]	128	jb SHORT UnsupportedFunction
[167]	129	cmp ah, 48h
[417]	130	ja SHORT UnsupportedFunction
[165]	131	jmp [cs:bx+g_rgwEbiosFunctionJumpTable]
[417]	132	%endif ; MODULE_EBIOS
[3]	133
[417]	134
[322]	135	ALIGN JUMP_ALIGN
	136	.NotOurDrive:
	137	test ah, ah
	138	jz SHORT .OurFunction ; We handle all function 0h requests (resets)
[260]	139
[322]	140	%ifndef MODULE_SERIAL_FLOPPY
	141	; Without floppy support, we handle only hard disk traffic for function 08h.
	142	test dl, dl
	143	jns SHORT Int13h_DirectCallToAnotherBios
	144	%endif
	145	; With floppy support, we handle all traffic for function 08h, as we need to wrap both hard disk and floppy drive counts.
	146	cmp ah, 8
	147	je SHORT .OurFunction
	148	; Fall to Int13h_DirectCallToAnotherBios
	149
[417]	150
[3]	151	;--------------------------------------------------------------------
[417]	152	; UnsupportedFunction
[3]	153	; Int13h_DirectCallToAnotherBios
	154	; Parameters:
[148]	155	; DL: Translated drive number
[3]	156	; DS: RAMVARS segment
[150]	157	; SS:BP: Ptr to IDEPACK
[148]	158	; BX, DI: Corrupted on Int13h_DiskFunctionsHandler
[161]	159	; Other: Function specific INT 13h parameters
[3]	160	; Returns:
	161	; Depends on function
	162	; Corrupts registers:
	163	; Flags
	164	;--------------------------------------------------------------------
	165	ALIGN JUMP_ALIGN
[417]	166	UnsupportedFunction:
[3]	167	Int13h_DirectCallToAnotherBios:
[148]	168	call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
[150]	169	mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
	170	mov di, [bp+IDEPACK.intpack+INTPACK.di]
	171	mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
	172	push WORD [bp+IDEPACK.intpack+INTPACK.flags]
[148]	173	popf
	174	push bp
[150]	175	mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
[148]	176	int BIOS_DISK_INTERRUPT_13h ; Can safely do as much recursion as it wants
[3]	177
[148]	178	; Store returned values to INTPACK
	179	pop bp ; Standard INT 13h functions never uses BP as return register
	180	%ifdef USE_386
[322]	181	; mov [bp+IDEPACK.intpack+INTPACK.gs], gs
	182	; mov [bp+IDEPACK.intpack+INTPACK.fs], fs
[148]	183	%endif
[150]	184	mov [bp+IDEPACK.intpack+INTPACK.es], es
	185	mov [bp+IDEPACK.intpack+INTPACK.ds], ds
	186	mov [bp+IDEPACK.intpack+INTPACK.di], di
	187	mov [bp+IDEPACK.intpack+INTPACK.si], si
	188	mov [bp+IDEPACK.intpack+INTPACK.bx], bx
[493]	189	%ifdef MODULE_DRIVEXLATE
[150]	190	mov [bp+IDEPACK.intpack+INTPACK.dh], dh
[414]	191	%else
	192	mov [bp+IDEPACK.intpack+INTPACK.dx], dx
	193	%endif
[150]	194	mov [bp+IDEPACK.intpack+INTPACK.cx], cx
	195	mov [bp+IDEPACK.intpack+INTPACK.ax], ax
[148]	196	pushf
[150]	197	pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
[148]	198	call RamVars_GetSegmentToDS
[414]	199
[493]	200	%ifdef MODULE_DRIVEXLATE
[414]	201	cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv] ; DL is still drive number?
[148]	202	je SHORT .ExchangeInt13hHandlers
[414]	203	mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
[148]	204	ALIGN JUMP_ALIGN
	205	.ExchangeInt13hHandlers:
[414]	206	%endif
	207
[249]	208	%ifdef USE_186
	209	push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
	210	jmp SHORT ExchangeCurrentInt13hHandlerWithOldInt13hHandler
	211	%else
[148]	212	call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
[249]	213	jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
	214	%endif
[3]	215
[417]	216
[260]	217	%ifdef MODULE_SERIAL_FLOPPY
	218	;--------------------------------------------------------------------
	219	; Int13h_ReturnSuccessForFloppy
	220	;
	221	; Some operations, such as format of a floppy disk track, should just
	222	; return success, while for hard disks it should be treated as unsupported.
	223	;--------------------------------------------------------------------
	224	ALIGN JUMP_ALIGN
	225	Int13h_ReturnSuccessForFloppy:
	226	test dl, dl
[417]	227	js SHORT UnsupportedFunction
[294]	228	xor ah, ah
[417]	229	jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[260]	230	%endif
[3]	231
[417]	232
[3]	233	;--------------------------------------------------------------------
[249]	234	; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
	235	; Parameters:
	236	; AH: BIOS Error code
	237	; CL: Number of sectors actually transferred
	238	; SS:BP: Ptr to IDEPACK
	239	; Returns:
	240	; All registers are loaded from INTPACK
	241	;--------------------------------------------------------------------
	242	ALIGN JUMP_ALIGN
	243	Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL:
	244	mov [bp+IDEPACK.intpack+INTPACK.al], cl
	245	; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
	246
[417]	247
[249]	248	;--------------------------------------------------------------------
[148]	249	; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
	250	; Int13h_ReturnFromHandlerWithoutStoringErrorCode
[32]	251	; Parameters:
[148]	252	; AH: BIOS Error code
[417]	253	; DS: RAMVARS segment
[150]	254	; SS:BP: Ptr to IDEPACK
[32]	255	; Returns:
[148]	256	; All registers are loaded from INTPACK
[32]	257	;--------------------------------------------------------------------
	258	ALIGN JUMP_ALIGN
[148]	259	Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
[258]	260	%ifdef MODULE_SERIAL_FLOPPY
	261	mov al, [bp+IDEPACK.intpack+INTPACK.dl]
[294]	262	Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber:
[258]	263	call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
[414]	264
[258]	265	%else
[150]	266	call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
[258]	267	%endif
[414]	268
[148]	269	Int13h_ReturnFromHandlerWithoutStoringErrorCode:
[417]	270	; Always return with interrupts enabled since there are programs that rely
	271	; on INT 13h to enable interrupts.
	272	or BYTE [bp+IDEPACK.intpack+INTPACK.flags+1], (FLG_FLAGS_IF>>8)
	273	mov sp, bp ; This makes possible to exit anytime, no matter what is on stack
[443]	274	RESTORE_FRAME_INTPACK_FROM_SSBP SIZE_OF_IDEPACK_WITHOUT_INTPACK
[32]	275
	276
	277	;--------------------------------------------------------------------
[148]	278	; Int13h_CallPreviousInt13hHandler
[3]	279	; Parameters:
[148]	280	; AH: INT 13h function to call
	281	; DL: Drive number
	282	; DS: RAMVARS segment
[3]	283	; Returns:
	284	; Depends on function
[294]	285	; NOTE: ES:DI needs to be returned from the previous interrupt
[258]	286	; handler, for floppy DPT in function 08h
[3]	287	; Corrupts registers:
[258]	288	; None
[3]	289	;--------------------------------------------------------------------
	290	ALIGN JUMP_ALIGN
[148]	291	Int13h_CallPreviousInt13hHandler:
	292	call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
	293	int BIOS_DISK_INTERRUPT_13h
[258]	294	;;; fall-through to ExchangeCurrentInt13hHandlerWithOldInt13hHandler
[35]	295
[3]	296	;--------------------------------------------------------------------
[148]	297	; ExchangeCurrentInt13hHandlerWithOldInt13hHandler
[3]	298	; Parameters:
	299	; DS: RAMVARS segment
	300	; Returns:
[148]	301	; Nothing
[3]	302	; Corrupts registers:
[258]	303	; Nothing
	304	; Note: Flags are preserved
[3]	305	;--------------------------------------------------------------------
	306	ALIGN JUMP_ALIGN
[148]	307	ExchangeCurrentInt13hHandlerWithOldInt13hHandler:
	308	push es
[258]	309	push si
	310	LOAD_BDA_SEGMENT_PRESERVE_FLAGS_TO es, si
	311	mov si, [RAMVARS.fpOldI13h]
[150]	312	cli
[258]	313	xchg si, [es:BIOS_DISK_INTERRUPT_13h*4]
	314	mov [RAMVARS.fpOldI13h], si
	315	mov si, [RAMVARS.fpOldI13h+2]
	316	xchg si, [es:BIOS_DISK_INTERRUPT_13h*4+2]
[181]	317	sti
[258]	318	mov [RAMVARS.fpOldI13h+2], si
	319	pop si
[148]	320	pop es
	321	ret
[28]	322
[35]	323
[150]	324	;--------------------------------------------------------------------
	325	; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
	326	; Int13h_SetErrorCodeToIntpackInSSBPfromAH
	327	; Parameters:
	328	; AH: BIOS error code (00h = no error)
	329	; SS:BP: Ptr to IDEPACK
	330	; Returns:
	331	; SS:BP: Ptr to IDEPACK with error condition set
	332	; Corrupts registers:
	333	; DS, DI
	334	;--------------------------------------------------------------------
	335	ALIGN JUMP_ALIGN
[258]	336	%ifdef MODULE_SERIAL_FLOPPY
	337	Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber:
	338	; Store error code to BDA
	339	mov bx, BDA.bHDLastSt
	340	test al, al
[414]	341	js SHORT .HardDisk
[258]	342	mov bl, BDA.bFDRetST & 0xff
	343	.HardDisk:
	344	LOAD_BDA_SEGMENT_TO ds, di
[294]	345	mov [bx], ah
[417]	346	; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
	347
[258]	348	%else
[150]	349	Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
	350	; Store error code to BDA
[294]	351	LOAD_BDA_SEGMENT_TO ds, di
[150]	352	mov [BDA.bHDLastSt], ah
[417]	353	; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
[258]	354	%endif
[35]	355
[150]	356	; Store error code to INTPACK
	357	Int13h_SetErrorCodeToIntpackInSSBPfromAH:
	358	mov [bp+IDEPACK.intpack+INTPACK.ah], ah
	359	test ah, ah
	360	jnz SHORT .SetCFtoIntpack
	361	and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
	362	ret
	363	.SetCFtoIntpack:
	364	or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
	365	ret
	366
	367
[3]	368	; Jump table for correct BIOS function
	369	ALIGN WORD_ALIGN
	370	g_rgw13hFuncJump:
[417]	371	dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
	372	dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
	373	dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
	374	dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
	375	dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
[260]	376	%ifdef MODULE_SERIAL_FLOPPY
[417]	377	dw Int13h_ReturnSuccessForFloppy ; 05h, Format Disk Track (XT, AT, EISA)
[260]	378	%else
[417]	379	dw UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
[260]	380	%endif
[417]	381	dw UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
	382	dw UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
	383	dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
	384	dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
	385	dw UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
	386	dw UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
	387	dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
[507]	388	dw AH9h_HandlerForInitializeDriveParameters ; 0Dh, Alternate Disk Reset (All)
[417]	389	dw UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
	390	dw UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
	391	dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
	392	dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
	393	dw UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
	394	dw UnsupportedFunction ; 13h, Drive Diagnostic (XT)
	395	dw UnsupportedFunction ; 14h, Controller Internal Diagnostic (All)
	396	dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
	397	dw UnsupportedFunction ; 16h,
	398	dw UnsupportedFunction ; 17h,
	399	dw UnsupportedFunction ; 18h,
	400	dw UnsupportedFunction ; 19h, Park Heads (PS/2)
	401	dw UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
	402	dw UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
	403	dw UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
	404	dw UnsupportedFunction ; 1Dh,
[493]	405	%ifdef MODULE_8BIT_IDE_ADVANCED
[471]	406	dw AH1Eh_HandlerForXTCFfeatures ; 1Eh, Lo-tech XT-CF features (XTIDE Universal BIOS)
	407	%else
[525]	408	dw UnsupportedFunction ; 1Eh,
[471]	409	%endif
[417]	410	dw UnsupportedFunction ; 1Fh,
	411	dw UnsupportedFunction ; 20h,
	412	dw UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
	413	dw UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
	414	dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
	415	dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
	416	dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
[165]	417
[176]	418	%ifdef MODULE_EBIOS
[165]	419	g_rgwEbiosFunctionJumpTable:
[417]	420	dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
	421	dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
	422	dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
	423	dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
	424	dw UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
	425	dw UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
	426	dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
	427	dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
	428	; dw UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
	429	; dw UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
	430	; dw UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
	431	; dw UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
	432	; dw UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
	433	; dw UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
[150]	434	;
	435	; * = Enhanced Drive Access Support (minimum required EBIOS functions)
	436	; ** = Enhanced Disk Drive (EDD) Support
	437	; *** = Drive Locking and Ejecting Support
[181]	438	%endif

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