Changeset 448 in xtideuniversalbios


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Sep 6, 2012, 4:52:31 PM (10 years ago)
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aitotat@…
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aitotat@gmail.com
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Edited wiki page Manual_v2_0_0 through web user interface.

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  • wiki/Manual_v2_0_0.wiki

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    55
    66= Introduction =
     7
     8Note! This manual is currently being updated for v2.0.0 beta 2. It will be released when all documentation is fully up to date.
    79
    810XTIDE Universal BIOS makes it possible to use modern large ATA hard disks or Compact Flash cards on old PC's. You can then enjoy quiet or noiseless drives with more capacity than you'll ever need for old computers.
     
    3032  * Supports up to 4 IDE controllers
    3133  * Support for virtual drives via serial port, [SerialDrives more information]
    32   * Supports drives with any capacity (MS-DOS 7.x or FreeDOS is required to access more than 8.4 GB)
     34  * Supports drives with any capacity (MS-DOS 7.x (Windows 9x) or FreeDOS is required to access more than 8.4 GB)
    3335  * PIO transfers with block mode support
    3436  * Hard disk autodetection
    3537  * Autodetected capacity, both CHS and LBA, can be overridden to make drive appear smaller than it actually is
    36   * Boot menu for selecting any floppy drive or hard disk to boot from, including hard disks that are not handled by XTIDE Universal BIOS
     38  * Hotkeys and optional Boot menu (included in official 15k builds) for selecting any floppy drive or hard disk to boot from, including hard disks that are not handled by XTIDE Universal BIOS
    3739  * Compact Flash and Microdrive support
    3840  * Support for most 8-, 16-, and 32-bit IDE controllers
     41  * Native support for QDI Vision QD6500 and QD6580 VLB IDE controllers
    3942...and many more.
    4043
     
    4245== Different builds ==
    4346
    44 There are currently several different builds included in the XTIDE Universal BIOS zip file. 15 kiB builds (xxxL.BIN) includes support for JR-IDE/ISA but are otherwise the same as 8 kiB builds.
    45   * IDE_XT.BIN, IDE_JR8K.BIN and IDE_XTL.BIN (XT build)
    46    XT build uses only instructions supported by the 8086/8088 CPUs making it the only build that can be used on any PC, including the original IBM PC model 5150. IDE_JR8K.BIN has JR-IDE/ISA support but serial port features are excluded to keep the size below 8 kiB.
    47   * IDE_XTP.BIN and IDE_XTPL.BIN (XT+ build)
    48    XT+ build has the same features as the XT build but XT+ build uses instructions introduced in 80186/80188. Those instructions are supported by all later x86 CPUs, including NEC V20/V30. 8-bit transfer rates will be better thanks to INS and OUTS instructions.
    49   * IDE_AT.BIN and IDE_ATL.BIN (AT build)
    50    AT build is meant for all AT class machines (16-bit or 32-bit bus). AT build supports OS hooks to allow the operating system to do some processing while the drive seeks the requested data (if interrupts are enabled).
    51 
    52 All XT builds (including XT+) can be used on AT systems but XT builds have a few differences that make them better suited for XT systems:
    53   * XT builds prevent CGA snow on boot menu but this slows down drawing the menu.
    54   * XT builds use a much simpler method for detecting if an INT 40h Floppy Drive handler is installed.
    55   * Jump targets are not aligned on XT builds.
    56   * XT builds have different default settings (see below).
    57 
    58 XT builds are preconfigured for XTIDE rev1 at port 300h and IDE_JR8K.BIN is preconfigured for JR-IDE/ISA. AT builds are configured to search standard Primary and Secondary IDE drives, XTIDE rev1 at port 300h and 4th stardard IDE controller at port 168h (found on many sound cards). Interrupts are disabled by default on all builds.
     47XTIDE Universal BIOS includes many modules and features that are optional. It is not possible to include them all into 8k builds. Officially released builds include modules that benefits most people. You can quite easily make your own build to include the features that you need if you are not satisfied on the official builds.
     48
     49=== Modules included in officially released builds ===
     50
     51[http://code.google.com/p/xtideuniversalbios/wiki/BuildInstructions See build instructions for module descriptions].
     52
     53||File||Description||MODULE_8BIT_IDE||MODULE_JRIDE||MODULE_ADVANCED_ATA||MODULE_BOOT_MENU||MODULE_IRQ||MODULE_SERIAL||MODULE_SERIAL_FLOPPY||ELIMINATE_CGA_SNOW||RELOCATE_INT13H_STACK||USE_186||USE_AT||
     54||ide_xt.bin||8088/8086 compatible 8 kiB XT build||√||√||-||-||-||√||√||√||-||-||-||
     55||ide_xtp.bin||8 kiB XT+ build requiring 80188/80186 or better||√||√||-||-||-||√||√||√||-||√||-||
     56||ide_at.bin||8 kiB AT build requiring 286 or better||-||-||√||-||√||√||√||-||√||√||√||
     57||ide_xtl.bin||8088/8086 compatible 15 kiB XT build||√||√||-||√||-||√||√||√||-||-||-||
     58||ide_xtpl.bin||15 kiB XT+ build requiring 80188/80186 or better||√||√||-||√||-||√||√||√||-||√||-||
     59||ide_atl.bin||15 kiB AT build requiring 286 or better||-||-||√||√||√||√||√||-||√||√||√||
     60
     61All official builds include the following modules and features:
     62MODULE_STRINGS_COMPRESSED, MODULE_HOTKEYS, MODULE_EBIOS, MODULE_FEATURE_SETS and RESERVE_DIAGNOSTIC_CYLINDER
    5963
    6064----
    6165= Installing XTIDE Universal BIOS =
    6266
    63 == Important if you are upgrading from XTIDE Universal BIOS v1.x.x. ==
    64 
    65 The new v2.0.0 version, like most other BIOSes, adheres to the Phoenix Enhanced Disk Drive Specification. The older v1.x.x versions do NOT - they have a bug in that they may generate different L-CHS parameters for LBA drives. If you move a drive handled by a v1.x.x BIOS to another system or upgrade to v2.x.x you risk data corruption if different L-CHS parameters are used.
    66 
    67 IMPORTANT! This means that, after upgrading to XTIDE Universal BIOS v2.x.x, you need to re-create and format any partitions on drives handled by this BIOS.
     67== Important if you are upgrading from any previous XTIDE Universal BIOS version ==
     68
     69The new v2.0.0 beta 2 version, like most other BIOSes, adheres to the Phoenix Enhanced Disk Drive Specification. The older v1.x.x versions and v2.0.0 beta 1 do NOT - they have a bugs in that they may generate different L-CHS parameters for many drives. If you move a drive handled by a v1.x.x or v2.0.0 beta 1 BIOS to another system or upgrade to v2.x.x you risk data corruption if different L-CHS parameters are used.
     70
     71IMPORTANT! This means that, after upgrading to XTIDE Universal BIOS v2.0.0 beta 2, you need to re-create and format any partitions on drives handled by this BIOS.
    6872
    6973
    7074== Hardware supporting XTIDE Universal BIOS ROM ==
    7175
    72 The most convenient way to use XTIDE Universal BIOS is to use an [http://www.vintage-computer.com/vcforum/showwiki.php?title=XTIDE+Rev2 XTIDE card]. It can be used on any PC with a free 8-bit ISA slot. You might not want to connect any drives to it in 16- or 32-bit systems since 8-bit transfers will be very slow. Using the XTIDE card allows EEPROM flashing so it is really easy to update XTIDE Universal BIOS.
     76The most convenient way to use XTIDE Universal BIOS is to use an [http://www.vintage-computer.com/vcforum/showwiki.php?title=XTIDE+Rev2 XTIDE card] or [http://www.lo-tech.co.uk/wiki/Lo-tech_XT-CF_Board Lo-tech XT-CF] that hopefully will be available soon. They can be used on any PC with a free 8-bit ISA slot. You might not want to connect any drives to them in 16- or 32-bit systems since 8-bit transfers will be very slow. Using the XTIDE card allows EEPROM flashing so it is really easy to update XTIDE Universal BIOS.
    7377
    7478Another option is to use any card with a free ROM socket for 8 kiB or larger ROMs. Official XTIDE builds are meant for 8 kiB and 16 kiB ROMs but you can burn it on a larger ROM if you append enough zeroes to the end (only append zeroes so checksum does not change). Many network cards have unused ROM sockets and there are also a few multi I/O cards and IDE controllers with ROM sockets. These cards remains fully usable even if you place a ROM with XTIDE Universal BIOS on them.
     
    9599
    96100== Menu items on "Main Menu" ==
    97   * Exit to DOS
    98    Exits to DOS. If you have made configuration changes, then a dialog will be displayed asking if you want to save them. You can also exit to DOS by pressing Esc at the main menu.
     101  * Copyright and License Information
     102    Displays just that.
    99103  * Load BIOS from file
    100104   Loads any (not just XTIDE Universal BIOS) file to be flashed.
     
    107111  * Flash EEPROM
    108112   This menu item appears when a file has been loaded.
     113  * Save BIOS back to original file
     114  * Exit to DOS
     115   Exits to DOS. If you have made configuration changes, then a dialog will be displayed asking if you want to save them. You can also exit to DOS by pressing Esc at the main menu.
     116  * Web Links
    109117
    110118== Menu items on "Flash EEPROM" submenu ==
     
    130138  * Boot settings
    131139   Opens submenu for boot related settings such as should boot menu be enabled etc.
    132   * Full operating mode [default=No for XT builds, Yes for AT builds]
     140  * Full operating mode [default=No for XT builds, not used for AT builds]
    133141   "Full operating mode" reserves a bit of Conventional memory for XTIDE Universal BIOS variables. Disabling this will reduce the maximum number of supported IDE controllers to 2 and place the variables in a memory area reserved for IBM ROM Basic (30:0h). You should always enable this option unless:
    134142    # You don't need to use IBM ROM Basic or any BIOS or software that requires that memory area.
     
    137145  * kiB to steal from RAM [default=1]
    138146   This menu item will appear only when "Full operating mode" is enabled. Leave it at the default unless you need to enable "Full operating mode" on Tandy 1000 models with 640k or less RAM. Setting this to 33 (almost always enough) or 65 (always enough) will reserve the top of RAM to Tandy video circuitry in addition to the XTIDE Universal BIOS variables thus avoiding a conflict between the two.
    139   * IDE controllers
     147  * IDE controllers [default=1 for XT builds, 2 for AT builds]
    140148   Number of IDE controllers to be searched by XTIDE Universal BIOS. The maximum is 4 if "Full operating mode" is enabled. Otherwise the maximum is 2.
    141149
     
    143151  * Display Mode [default=Default]
    144152   This setting allows you to force a display mode change before the boot menu is displayed. This setting will work even if the boot menu has been disabled and will leave the specified display mode set when booting to the OS. Forcing the display mode can be handy if you have a composite monitor (use 40 column modes for better readability) or a black&white VGA monitor (use 80 column black&white mode for better readability).
    145   * Number of Floppy Drives [default=Auto]
     153  * Number of Floppy Drives [default=1 for XT builds, Auto for AT builds]
    146154   In some systems the number of floppy drives cannot be reliably autodetected. This setting allows you to specify it manually so all drives can be displayed on the boot menu.
    147155  * Scan for Serial Devices [default=No]
    148156   When enabled, the BIOS will scan COM1-7 for a Serial Drive server at the end of standard drive detection. Even without this option enabled, holding down the ALT key at the end of drive detection will accomplish the same thing (useful for bootstrapping scenarios). The BIOS will display "Serial Master on COM Detect:" while it is scanning. See the [SerialDrives Serial Drive] documentation for more information.
    149   * Boot Menu [default=Yes]
    150    You can disable the boot menu if you don't like it for some reason. Normal Drive A, then C, then INT 18h (ROM Basic, ROM DOS or boot error) boot order is used when the boot menu is disabled.
    151157  * Default boot drive [default=80h]
    152    Specifies what drive is highlighted on boot menu by default. The default of 80h means the first hard drive in the system.
     158   Specifies what drive is booted by default unless user selects other drive using hotkeys or boot menu. The default of 80h means the first hard drive in the system. 00h means first floppy drive in the system if you want floppy drive A to be first.
    153159  * Selection timeout [default=540]
     160   Appears only if boot menu is included in the build.
    154161   Specifies the duration in timer ticks before the default boot drive is automatically selected. 1 tick = 54.9 ms so the default of 540 is about 30 seconds.
    155   * Swap boot drive numbers [default=yes]
    156    MS-DOS and old operating systems can only boot from first floppy or hard disk drive. Swapping boot drive numbers allows booting from all drives in the system.
    157162
    158163
     
    164169   Opens submenu for Master/Slave Drive specific settings for this IDE Controller.
    165170  * Device Type [default=XTIDE for XT builds, 16-bit for AT builds]
    166    Type of device. 16-bit will support all standard IDE controllers, including VLB controllers. 32-bit will use 32-bit transfers on VLB controllers but those controllers usually require native support for full speed. Other devices include XTIDE rev1 (and rev2 slow mode), XTIDE mod with swapped A0 and A3 address lines (XTIDE rev2 fast mode), JR-IDE/ISA (IDE_JR8K.BIN and 15 kiB builds only) and [SerialDrives support for virtual devices through serial port]. Note that a serial port controller must be the last configured IDE controller. XTIDECFG will automatically move any serial ports to the end of the list if needed. This is done so that serial floppy disks, if any are present, will be last on the list of drives detected.
    167   * Base (cmd block) address [default=300h for XT builds, 1F0h for AT builds (Primary IDE)]
     171   Type of device. 16-bit will support all standard IDE controllers, including VLB controllers. 32-bit will use 32-bit transfers on unidentified VLB/PCI controllers but those controllers usually require native support for full speed. Other devices include XTIDE rev1 (and rev2 slow mode), XTIDE mod with swapped A0 and A3 address lines (XTIDE rev2 fast mode), JR-IDE/ISA (requires MODULE_JRIDE), Lo-tech XT-CF and [SerialDrives support for virtual devices through serial port]. Note that a serial port controller must be the last configured IDE controller. XTIDECFG will automatically move any serial ports to the end of the list if needed. This is done so that serial floppy disks, if any are present, will be last on the list of drives detected.
     172  * Base (cmd block) address [default=300h for XT builds, 1F0h (Primary IDE) and 170h (Secondary IDE) for AT builds]
    168173   Command block (base port) address where the IDE Controller is located. JR-IDE/ISA does not use this setting.
    169   * Control block address [default=308h for XT builds, 3F0h for AT builds (Primary IDE)]
    170    Set to base port + 8h for XTIDE rev1 and rev2. Set to base port + 200h for standard IDE controllers. JR-IDE/ISA does not use this setting.
     174  * Control block address [default=308h for XT builds, 3F0h/370h for AT builds]
     175   Set to base port + 8h for XTIDE rev1, rev2 and Lo-tech XT-CF. Set to base port + 200h for standard IDE controllers. JR-IDE/ISA does not use this setting.
    171176  * Enable interrupt [default=no]
    172177   Enables interrupt but it does not offer any benefit for MS-DOS. Do not enable unless you know you need it.
    173178  * IRQ [default=14 for Primary IDE, 15 for Secondary IDE]
     179   Appears only when MODULE_IRQ is available.
    174180   IRQ channel to use for IDE controllers.
    175181  * COM Port [default=COM1]
    176   * Baud Rate [default=9600]
     182    Appears only when serial port virtual device is selected.
     183  * Baud Rate [default=38.4K]
     184    Appears only when serial port virtual device is selected.
    177185
    178186=== Menu items for "Master/Slave Drive" submenus ===
     
    180188  * Block Mode Transfers [default=Yes]
    181189   Block Mode Transfers will speed up the transfer rates. This should be left enabled but there is at least one old hard drive with buggy block mode support when interrupts are enabled (Quantum, maybe 100MB).
     190  * CHS Translation Method [default=Auto]
     191    The NORMAL/LARGE/LBA selection seen on many BIOSes. Leave this to Auto unless you want this to be the same you are using on some other BIOS.
    182192  * Internal Write Cache [default=Disabled]
    183193   This should be left disabled unless you know what you are doing! Improper use of write cache can cause data corruption.
    184194  * User specified CHS [default=no]
    185    Specify CHS parameters manually. This will force the drive to CHS addressing and EBIOS functions will be disabled.
     195   Specify CHS parameters manually. This will force the drive to CHS addressing and EBIOS functions will be disabled. Specifying CHS manually makes the drive incompatible with other BIOSes unless they are specified to use the same CHS parameters.
    186196  * User specified LBA [default=no]
    187197   Specify drive capacity manually (starting from 8.4 GB). All versions of MS-DOS 7.x (Windows 9x) seem to have compatibility problems with very large drives so you might need to reduce drive capacity. Use FreeDOS if you want to use full capacity of the drive.
     
    192202
    193203----
     204= Hotkeys =
     205
     206You will see Hotkeybar at the top of screen during drive detection. Hotkeys are available during that time and selected hotkeys will be displayed on the Hotkeybar.
     207
     208Keys A to Z work as hotkeys for drives to select as boot device. Hotkeys have another benefit: they allow the installation of DOS from any floppy drive to any hard disk. For example if you want to install DOS from floppy drive B to Hard Drive D then first press D and then B. The last drive selected is always the drive to boot from.
     209
     210F2 displays boot menu (available only if MODULE_BOOT_MENU is available).
     211
     212F8 calls software interrupt 18h. This starts IBM ROM Basic, ROM DOS or displays an error message from the motherboard BIOS when there is no ROM to boot from.
     213
     214
     215== Drive swapping ==
     216
     217DOS requires that it is loaded from the first floppy drive (00h) or the first hard disk (80h) in the system. XTIDE Universal BIOS translates drive numbers to make booting possible from any floppy drive or hard disk. Drive number translation is implemented with a simple swapping method: selected drive will be swapped with first drive and vice versa. For example drive 81h (Second hard drive) would be translated to 80h (First hard drive) and 80h would be translated to 81h. Drive swapping for floppy drives and hard disks are handled separately to make possible to install DOS from any floppy drive to any hard disk.
     218
     219---
    194220= Boot menu =
    195221
    196 Using the boot menu is optional. The boot menu allows the computer to boot from any floppy or hard disk drive. Drive can be selected with Up and Down arrows. Home, End, PgUp and PgDn keys can speed up selection if there are many drives in the boot menu. Press Enter to boot from selected drive.
    197 
    198 
    199 == Drive swapping ==
    200 
    201 DOS requires that it is loaded from the first floppy drive (00h) or the first hard disk (80h) in the system. XTIDE Universal BIOS can translate drive numbers to make booting possible from any floppy drive or hard disk. Drive number translation is implemented with a simple swapping method: selected drive will be swapped with first drive and vice versa. For example drive 82h on boot menu would be translated to 80h and 80h would be translated to 82h. Drive swapping for floppy drives and hard disks are handled separately so it is possible to install DOS from any floppy drive to any hard disk. Drive number translation can be disabled with XTIDECFG.COM (see "Swap boot drive numbers" on Menu items on "Boot settings" submenu).
     222Using the boot menu is optional and it is not included in official 8 kiB builds. Boot menu does not offer any more functionality than hotkeys except to display drive information. Drive can be selected with Up and Down arrows. Home, End, PgUp and PgDn keys can speed up selection if there are many drives in the boot menu. Press Enter to boot from selected drive.
    202223
    203224
    204225== Boot menu hotkeys ==
    205226
    206 Keys A to Z work as hotkeys for boot menu drives. Hotkeys have another benefit: they allow the installation of DOS from any floppy drive to any hard disk. Select hard disk from the menu but do not press Enter. Press any floppy drive hotkey instead to boot from floppy while maintaining selected hard disk translation.
    207 
    208 F8 calls software interrupt 18h. This starts IBM ROM Basic, ROM DOS or displays an error message from the motherboard BIOS when there is no ROM to boot from.
     227All hotkeys from Hotkeybar are available when Boot Menu is displayed.
    209228
    210229
     
    243262It is very likely that this same problem will occur if you decide to use MS-DOS 7.x (Windows 9x) or FreeDOS and a large FAT32 partition on a slow 386 or even 486.
    244263
    245 == XTIDE Universal BIOS v2.x.x has worse transfer rates than v1.1.5! ==
    246 There are three reasons for this:
    247   * Virtual device support, XTIDE A0-A3 address line swap mod and memory mapping support for JR-IDE/ISA require some generalizations in code that results in more comparisons, jumps and function calls than before. All this overhead makes transfers slower and it is especially noticeable on older and slower CPUs.
    248   * v2 has some improvements in error handling that also makes the CPU do more work.
    249   * v2 disables Drive Internal Cache by default. MS-DOS does not access hard drives directly and there are no BIOS function to flush the cache so data corruption is likely when using modern drives with large internal caches unless the write cache is disabled. Disabling the write cache has a much less hit on performance than you might think so it is not a good idea to enable the write cache.
    250 
    251 If you are happy with v1.1.5 then go ahead and use it. I think most people will find that v2 is worth the upgrade even though the transfer rates are a bit slower.
    252 
    253 Here are some transfer rate comparisons between v1.1.5 and v2.0.0β1. Results are from [http://www.brutman.com/iotest.zip IOTEST by Michael B. Brutman].
    254 
    255 The test system is a 486DX4 100 MHz with a VLB Multi I/O card and a 6 GB Hitachi Microdrive. XTIDE Universal BIOSes are configured for 16-bit transfers.
    256 ||Internal Cache||Shadow RAM||v1.1.5||v2.0.0β1||
    257 ||Enabled||Disabled||1399.22 KB/s||1185.50 KB/s||
    258 ||Enabled||Enabled||1931.79 KB/s||1911.37 KB/s||
    259 ||Disabled||Disabled||1358.26 KB/s||1145.48 KB/s||
    260 ||Disabled||Enabled||1873.80 KB/s||1851.30 KB/s||
    261 
    262264
    263265== Importance of Shadow RAM ==
     
    270272You should be aware that you most likely need to disable Shadow RAM when you flash the EEPROM. Another thing to note is that JR-IDE/ISA does not work if Shadow RAM or ROM area caching is enabled. You wouldn't want to connect drives to an 8-bit bus on a 32-bit system anyway. You can use the JR-IDE/ISA if you just need the 512 kiB FLASH.
    271273
    272 == Configuring hints ==
    273 CHS addressing modes are a bit faster than LBA addressing modes so you might want to manually specify CHS parameters for XT systems.
     274Here are some transfer rate comparisons using v2.0.0β1. Results are from [http://www.brutman.com/iotest.zip IOTEST by Michael B. Brutman].
     275
     276The test system is a 486DX4 100 MHz with a VLB Multi I/O card and a 6 GB Hitachi Microdrive. XTIDE Universal BIOS is configured for 16-bit transfers without support for that specific VLB IDE controller.
     277||Internal Cache||Shadow RAM||KB/s||
     278||Enabled||Disabled||1185.50||
     279||Enabled||Enabled||1911.37||
     280||Disabled||Disabled||1145.48||
     281||Disabled||Enabled||1851.30||
    274282
    275283----
    276284= IDE controllers on VLB and PCI bus =
    277285
    278 16-bit ISA IDE controllers are basically very simple ISA to PATA adapters so they all perform alike. ISA is not fast enough for anything above PIO-0 transfer method (with a theoretical maximum of 3.3 MB/s).
     28616-bit ISA IDE controllers or more properly interface cards are basically very simple ISA to Parallel ATA adapters so they all perform alike. ISA is not fast enough for anything above PIO-0 transfer method (with a theoretical maximum of 3.3 MB/s).
    279287
    280288VLB and PCI IDE controllers are more complex since they have an actual controller between bus and IDE drive. This controller can buffer the data so the CPU can read 32-bits at a time. Early VLB controllers are limited to PIO-2 but later VLB controllers and (all?) PCI controllers also support PIO modes 3 and 4. These later VLB multi I/O cards have two IDE connectors so you should use one of those even if you don't need the other IDE connector.
     
    282290Unfortunately many of the controllers work only at PIO-0 by default. Some VLB multi I/O cards have jumpers to set transfer rates but most require controller specific programming to enable higher PIO modes. It is possible that your VLB multi I/O card don't offer any advantages over ISA multi I/O cards if your BIOS does not support the IDE controller on the VLB card. There are DOS drivers for many VLB IDE controllers so BIOS support isn't a necessity.
    283291
    284 XTIDE Universal BIOS does not support any specific VLB controllers at the moment. I'm planning to add native support for Vision QD6580 controllers soon (for real this time).
    285 
    286 ----
    287 = Known problems with fixes (v2.0.0 beta 1)=
     292At the moment XTIDE Universal BIOS has native support for QDI Vision QD6500 and QD6580 VLB IDE controllers. The support is included in MODULE_ADVANCED_ATA that is included in official AT builds by default.
     293
     294----
     295= Known problems with fixes (v2.0.0 beta 2)=
    288296
    289297===Flashing sometimes fails on a Pentium system===
     
    295303
    296304= Other known problems =
    297   * Wrong MDA cursor gets displayed after exiting boot menu.
    298305  * Flash utility hung the PC when saving settings on one occasion (maybe because the FDD entry point was via the BIOS just over-written?)
    299306
     
    304311
    305312The MBR can be re-created with FDISK using the /MBR switch. You can also use any low-level data wipe utility to clear a non-bootable MBR. The MBR will then be created automatically when partitioning the drive.
     313
     314Some CF cards and microdrives do not work properly with IBM 5150/5160 when using XTIDE rev 1 or rev 2. Some of the symptoms are improperly displayed drive name on boot menu or the drive appears to work on some occasions and sometimes not. This is a hardware related problem and cannot be fixed by software. Wait for Lo-tech XT-CF to be available or use known working drive such as Hitachi 6 GB microdrive.
    306315
    307316----
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