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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm@ 559

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Last change on this file since 559 was 558, checked in by krille_n_@…, 11 years ago

Changes:

Building the BIOS Drive Information Tool now works again.
Moved all XT-CF related code to MODULE_8BIT_IDE_ADVANCED. I don't see how an XT-CF card could work without *_ADVANCED anyway but if I'm wrong, feel free to undo this. Note! The autodetection code in XTIDECFG has NOT been changed to reflect this (still relies on MODULE_8BIT_IDE).
Optimizations and fixes in general.

File size: 16.1 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
[556]	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
[395]	105	%endif
[322]	106	call FindDPT_ForDriveNumberInDL ; DS:DI points to our DPT, or NULL if not our drive
	107	jc SHORT .NotOurDrive ; DPT not found so this is not one of our drives
[258]	108
[294]	109	.OurFunction:
[3]	110	; Jump to correct BIOS function
[148]	111	eMOVZX bx, ah
[445]	112	eSHL_IM bx, 1
[165]	113	cmp ah, 25h ; Possible EBIOS function?
[417]	114	%ifndef MODULE_EBIOS
	115	ja SHORT UnsupportedFunction
	116	jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
	117
	118	%else ; If using MODULE_EBIOS
[165]	119	ja SHORT .JumpToEbiosFunction
[148]	120	jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
[3]	121
[165]	122	ALIGN JUMP_ALIGN
	123	.JumpToEbiosFunction:
[542]	124	test BYTE [di+DPT.bFlagsLow], FLGL_DPT_LBA
[417]	125	jz SHORT UnsupportedFunction ; No eINT 13h for CHS drives
[322]	126	sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table
[417]	127	jb SHORT UnsupportedFunction
[167]	128	cmp ah, 48h
[417]	129	ja SHORT UnsupportedFunction
[165]	130	jmp [cs:bx+g_rgwEbiosFunctionJumpTable]
[417]	131	%endif ; MODULE_EBIOS
[3]	132
[417]	133
[322]	134	ALIGN JUMP_ALIGN
	135	.NotOurDrive:
	136	test ah, ah
	137	jz SHORT .OurFunction ; We handle all function 0h requests (resets)
[260]	138
[556]	139	%ifndef MODULE_SERIAL_FLOPPY
	140	; Without floppy support, we handle only hard disk traffic for function 08h.
	141	test dl, dl
	142	jns SHORT Int13h_DirectCallToAnotherBios
	143	%endif
	144	; With floppy support, we handle all traffic for function 08h, as we need to wrap both hard disk and floppy drive counts.
	145	cmp ah, GET_DRIVE_PARAMETERS
[322]	146	je SHORT .OurFunction
	147	; Fall to Int13h_DirectCallToAnotherBios
	148
[417]	149
[3]	150	;--------------------------------------------------------------------
[417]	151	; UnsupportedFunction
[3]	152	; Int13h_DirectCallToAnotherBios
	153	; Parameters:
[148]	154	; DL: Translated drive number
[3]	155	; DS: RAMVARS segment
[150]	156	; SS:BP: Ptr to IDEPACK
[148]	157	; BX, DI: Corrupted on Int13h_DiskFunctionsHandler
[161]	158	; Other: Function specific INT 13h parameters
[3]	159	; Returns:
	160	; Depends on function
	161	; Corrupts registers:
	162	; Flags
	163	;--------------------------------------------------------------------
	164	ALIGN JUMP_ALIGN
[417]	165	UnsupportedFunction:
[3]	166	Int13h_DirectCallToAnotherBios:
[557]	167	%ifdef MODULE_DRIVEXLATE
	168	; Disable drive number translations in case of recursive INT 13h calls
	169	mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl
	170	push WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap]
[558]	171	call DriveXlate_Reset ; No translation
[557]	172	%endif
	173
	174	push bp ; Store offset to IDEPACK (SS:SP now points it)
	175
	176	; Simulate INT by pushing flags and return address
	177	push WORD [bp+IDEPACK.intpack+INTPACK.flags]
	178	popf
	179	pushf ; Simulate INT by pushing flags
	180	push cs
	181	ePUSH_T di, .ReturnFromAnotherBios ; Can not corrupt flags
	182
	183	; Push old INT 13h handler and restore registers
	184	push WORD [RAMVARS.fpOldI13h+2]
	185	push WORD [RAMVARS.fpOldI13h]
[150]	186	mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
	187	mov di, [bp+IDEPACK.intpack+INTPACK.di]
	188	mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
	189	mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
[557]	190	retf ; "Return" to old INT 13h
	191	.ReturnFromAnotherBios:
[3]	192
[557]	193	%if 0
	194	; We need to restore our pointer to IDEPACK but we cannot corrupt any register
	195	push ax ; Dummy WORD
	196	cli
	197	xchg bp, sp
	198	mov [bp], sp ; Replace dummy WORD with returned BP
	199	mov sp, [bp+2] ; Load offset to IDEPACK
	200	xchg sp, bp
	201	sti ; We would have set IF anyway when exiting INT 13h
	202	pop WORD [bp+IDEPACK.intpack+INTPACK.bp]
	203	%endif
	204	; Actually we can corrupt BP since no standard INT 13h function uses it as return
	205	; register. Above code is kept here just in case if there is some non-standard function.
	206	; POP BP below also belongs to the above code.
	207	pop bp ; Clean IDEPACK offset from stack
[556]	208
[557]	209	; Store remaining returned values to INTPACK
[148]	210	%ifdef USE_386
[557]	211	; We do not use GS or FS at the moment
[322]	212	; mov [bp+IDEPACK.intpack+INTPACK.gs], gs
	213	; mov [bp+IDEPACK.intpack+INTPACK.fs], fs
[148]	214	%endif
[150]	215	mov [bp+IDEPACK.intpack+INTPACK.es], es
	216	mov [bp+IDEPACK.intpack+INTPACK.ds], ds
	217	mov [bp+IDEPACK.intpack+INTPACK.di], di
	218	mov [bp+IDEPACK.intpack+INTPACK.si], si
	219	mov [bp+IDEPACK.intpack+INTPACK.bx], bx
[493]	220	%ifdef MODULE_DRIVEXLATE
[150]	221	mov [bp+IDEPACK.intpack+INTPACK.dh], dh
[414]	222	%else
	223	mov [bp+IDEPACK.intpack+INTPACK.dx], dx
	224	%endif
[150]	225	mov [bp+IDEPACK.intpack+INTPACK.cx], cx
	226	mov [bp+IDEPACK.intpack+INTPACK.ax], ax
[148]	227	pushf
[150]	228	pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
[148]	229	call RamVars_GetSegmentToDS
[414]	230
[493]	231	%ifdef MODULE_DRIVEXLATE
[557]	232	; Restore drive number translation back to what it was
	233	pop WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap]
[414]	234	cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv] ; DL is still drive number?
[557]	235	je SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[414]	236	mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
	237	%endif
[249]	238	jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[3]	239
[417]	240
[260]	241	%ifdef MODULE_SERIAL_FLOPPY
	242	;--------------------------------------------------------------------
	243	; Int13h_ReturnSuccessForFloppy
	244	;
	245	; Some operations, such as format of a floppy disk track, should just
	246	; return success, while for hard disks it should be treated as unsupported.
	247	;--------------------------------------------------------------------
	248	ALIGN JUMP_ALIGN
	249	Int13h_ReturnSuccessForFloppy:
	250	test dl, dl
[417]	251	js SHORT UnsupportedFunction
[294]	252	xor ah, ah
[417]	253	jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[260]	254	%endif
[3]	255
[417]	256
[3]	257	;--------------------------------------------------------------------
[249]	258	; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
	259	; Parameters:
	260	; AH: BIOS Error code
	261	; CL: Number of sectors actually transferred
	262	; SS:BP: Ptr to IDEPACK
	263	; Returns:
	264	; All registers are loaded from INTPACK
	265	;--------------------------------------------------------------------
	266	ALIGN JUMP_ALIGN
	267	Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL:
	268	mov [bp+IDEPACK.intpack+INTPACK.al], cl
	269	; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
	270
[417]	271
[249]	272	;--------------------------------------------------------------------
[148]	273	; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
	274	; Int13h_ReturnFromHandlerWithoutStoringErrorCode
[32]	275	; Parameters:
[148]	276	; AH: BIOS Error code
[150]	277	; SS:BP: Ptr to IDEPACK
[32]	278	; Returns:
[148]	279	; All registers are loaded from INTPACK
[32]	280	;--------------------------------------------------------------------
	281	ALIGN JUMP_ALIGN
[148]	282	Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
[258]	283	%ifdef MODULE_SERIAL_FLOPPY
	284	mov al, [bp+IDEPACK.intpack+INTPACK.dl]
[294]	285	Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber:
[258]	286	call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
[414]	287
[258]	288	%else
[150]	289	call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
[258]	290	%endif
[414]	291
[148]	292	Int13h_ReturnFromHandlerWithoutStoringErrorCode:
[417]	293	; Always return with interrupts enabled since there are programs that rely
	294	; on INT 13h to enable interrupts.
	295	or BYTE [bp+IDEPACK.intpack+INTPACK.flags+1], (FLG_FLAGS_IF>>8)
	296	mov sp, bp ; This makes possible to exit anytime, no matter what is on stack
[443]	297	RESTORE_FRAME_INTPACK_FROM_SSBP SIZE_OF_IDEPACK_WITHOUT_INTPACK
[32]	298
	299
	300	;--------------------------------------------------------------------
[148]	301	; Int13h_CallPreviousInt13hHandler
[3]	302	; Parameters:
[148]	303	; AH: INT 13h function to call
	304	; DL: Drive number
	305	; DS: RAMVARS segment
[3]	306	; Returns:
	307	; Depends on function
[294]	308	; NOTE: ES:DI needs to be returned from the previous interrupt
[258]	309	; handler, for floppy DPT in function 08h
[3]	310	; Corrupts registers:
[258]	311	; None
[3]	312	;--------------------------------------------------------------------
	313	ALIGN JUMP_ALIGN
[148]	314	Int13h_CallPreviousInt13hHandler:
[557]	315	pushf ; Simulate INT by pushing flags
	316	call far [RAMVARS.fpOldI13h]
[148]	317	ret
[28]	318
[35]	319
[150]	320	;--------------------------------------------------------------------
	321	; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
	322	; Int13h_SetErrorCodeToIntpackInSSBPfromAH
	323	; Parameters:
	324	; AH: BIOS error code (00h = no error)
	325	; SS:BP: Ptr to IDEPACK
	326	; Returns:
	327	; SS:BP: Ptr to IDEPACK with error condition set
	328	; Corrupts registers:
	329	; DS, DI
	330	;--------------------------------------------------------------------
	331	ALIGN JUMP_ALIGN
[258]	332	%ifdef MODULE_SERIAL_FLOPPY
	333	Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber:
	334	; Store error code to BDA
	335	mov bx, BDA.bHDLastSt
	336	test al, al
[414]	337	js SHORT .HardDisk
[258]	338	mov bl, BDA.bFDRetST & 0xff
	339	.HardDisk:
	340	LOAD_BDA_SEGMENT_TO ds, di
[294]	341	mov [bx], ah
[417]	342	; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
	343
[258]	344	%else
[150]	345	Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
	346	; Store error code to BDA
[294]	347	LOAD_BDA_SEGMENT_TO ds, di
[150]	348	mov [BDA.bHDLastSt], ah
[417]	349	; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
[258]	350	%endif
[35]	351
[150]	352	; Store error code to INTPACK
	353	Int13h_SetErrorCodeToIntpackInSSBPfromAH:
	354	mov [bp+IDEPACK.intpack+INTPACK.ah], ah
	355	test ah, ah
	356	jnz SHORT .SetCFtoIntpack
	357	and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
	358	ret
	359	.SetCFtoIntpack:
	360	or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
	361	ret
	362
	363
[3]	364	; Jump table for correct BIOS function
	365	ALIGN WORD_ALIGN
	366	g_rgw13hFuncJump:
[417]	367	dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
	368	dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
	369	dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
	370	dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
	371	dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
[260]	372	%ifdef MODULE_SERIAL_FLOPPY
[417]	373	dw Int13h_ReturnSuccessForFloppy ; 05h, Format Disk Track (XT, AT, EISA)
[260]	374	%else
[417]	375	dw UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
[260]	376	%endif
[417]	377	dw UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
	378	dw UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
	379	dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
	380	dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
	381	dw UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
	382	dw UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
	383	dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
[507]	384	dw AH9h_HandlerForInitializeDriveParameters ; 0Dh, Alternate Disk Reset (All)
[417]	385	dw UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
	386	dw UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
	387	dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
	388	dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
	389	dw UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
	390	dw UnsupportedFunction ; 13h, Drive Diagnostic (XT)
[540]	391	dw AH10h_HandlerForCheckDriveReady ; 14h, Controller Internal Diagnostic (All)
[417]	392	dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
	393	dw UnsupportedFunction ; 16h,
	394	dw UnsupportedFunction ; 17h,
	395	dw UnsupportedFunction ; 18h,
	396	dw UnsupportedFunction ; 19h, Park Heads (PS/2)
	397	dw UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
	398	dw UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
	399	dw UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
	400	dw UnsupportedFunction ; 1Dh,
[493]	401	%ifdef MODULE_8BIT_IDE_ADVANCED
[471]	402	dw AH1Eh_HandlerForXTCFfeatures ; 1Eh, Lo-tech XT-CF features (XTIDE Universal BIOS)
	403	%else
[525]	404	dw UnsupportedFunction ; 1Eh,
[471]	405	%endif
[417]	406	dw UnsupportedFunction ; 1Fh,
	407	dw UnsupportedFunction ; 20h,
	408	dw UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
	409	dw UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
	410	dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
	411	dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
	412	dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
[165]	413
[176]	414	%ifdef MODULE_EBIOS
[165]	415	g_rgwEbiosFunctionJumpTable:
[417]	416	dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
	417	dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
	418	dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
	419	dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
	420	dw UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
	421	dw UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
	422	dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
	423	dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
	424	; dw UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
	425	; dw UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
	426	; dw UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
	427	; dw UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
	428	; dw UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
	429	; dw UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
[150]	430	;
	431	; * = Enhanced Drive Access Support (minimum required EBIOS functions)
	432	; ** = Enhanced Disk Drive (EDD) Support
	433	; *** = Drive Locking and Ejecting Support
[181]	434	%endif

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