Boot keys
This page was last modified 08:54, 2 January 2023 by Gdx. Based on work by Manuel and Sylvester and others.

When MSX standard was expanded, it became common standard to enable/disable features by holding down keys during MSX boot process. Here are listed some of the effects that you may expect:

KEY HANDLER EFFECT NOTES
[0] Nextor Disk-ROM Disable permanent disk emulation mode (boot on .emu image) by deleting the emulation data file pointer from the partition table.
[1] Disk-ROM v2.30~ Force starting in MSX-DOS1 mode, switches CPU to Z80 mode on turbo-R. Also Nextor Disk-ROM
[2] Nextor Disk-ROM Force starting in MSX-DOS1 mode, switches CPU to R800-ROM mode on turbo-R.
[3] Nextor Disk-ROM Boot directly to BASIC prompt (without execute AUTOEXEC.BAS).
[4] Nextor Disk-ROM Boot in R800-ROM mode, assign the largest mapper found as the primary mapper. MSX turbo R only
[5] Nextor Disk-ROM Assign only one drive to each Nextor kernel with a device-based driver regardless of the number of devices controlled by the driver.
[A] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in primary slot 2 or secondary slot 2-0.
[B] MSXDOS2.SYS v2.40 Boot directly to BASIC
[C] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 3-2.
[D] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 2-2.
[E] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 1-2.
[F] MegaFlashROM Prevent its installation when inserted in slot 2.
[F] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 2-3.
[H] Custom MSX2/MSX2+ machines This is used to reverse default 50/60Hz selection
[N] Nextor Disk-ROM Prevent installation of Nextor Disk-ROMs.
[R] MegaFlashROM Prevent its installation when inserted in slot 1.
[R] SVI-2000C Start ROGO "NYYRIKKI version"
[R] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 1-3.
[S] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 2-1.
[Q] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in primary slot 1 or secondary slot 1-0.
[V] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 3-3.
[W] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 1-1.
[X] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in secondary slot 3-1.
[Z] Nextor Disk-ROM Prevent installation of Nextor Disk-ROM when inserted in primary slot 3 or secondary slot 3-0.
[CTRL] Disk-ROM Disable phantom drives (e.g. use only physical drives) Without CTRL, 2 physical drives are handled. If second drives is not connected physical drive 1 is used instead of the second for copy.
[CTRL] Arabic support ROM Skips Arabic language support On all Arabic Sakhr MSXs + Arabic Almithali (Perfect 1 & 2)
[CTRL] SVI-2000C Start ROGO "gdx version"
[DEL] Panasonic FS-A1/A1mk2 Firmware Skip Desk-Pac software booting Probably works for other Panasonic machines as well
[DEL] Sony HB-F1/HB-F1II Firmware Skip Personal databank software booting
[DEL] Sunrise IDE BIOS Skip booting from the IDE device
[DOWN] GR8NET Cancels re-initialisation of the adapter into target mapper configuration during the cold boot. GR8NET will be forced to continue with mapper mode 0. Useful for firmware update which must be performed in mapper 0 only.
[ENTER] GR8NET Disable TCP/IP UNAPI
[ESC] GR8NET Skip start-up delay after adapter finishes initialisation
[ESC] MegaFlashROM Skip starting of ROM-image in flash Default key can be changed by user.
[ESC] Phillips NMS-1205 Skip internal software Custom software updates have many times reversed this effect.
[ESC] Panasonic FS-A1GT Clear RTC memory
[F1] GR8NET Forcefully reload RAM disk image even if valid image is detected in RAM, Disk-ROM must be enabled (by simultaneous pressing of F4 key)
[F2] GR8NET Invoke browser to load RAM disk image, Disk-ROM must be enabled (by simultaneous pressing of F4 key)
[F3] Carnivore 2 Default UI settings
[F3] GR8NET Disable build-in Disk-ROM
[F4] Carnivore 2 Cancel auto-start
[F4] GR8NET Enable built-in Disk-ROM
[F5] Carnivore 2 Skip Boot menu
[F5] GR8NET Forcefully disable GR8cloud device for Nextor (mapper modes 8-14)
[GRAPH] Novaxis SCSI BIOS Skip the Novaxis SCSI BIOS Gouda SCSI interface
[GRAPH]+[STOP] SUB-ROM Skip password prompt MSX2 and up
[SELECT] Game loaders This is used to force to 50/60Hz mode Common habit of cracked games
[SELECT] GR8NET Forcefully disable SD-card device for Nextor (mapper modes 8-14)
[SHIFT] Disk-ROM Skip initialization of Disk ROM
[TAB] GR8NET Invoke boot-up menu
[UP] MegaFlashROM Enter recovery menu
[UP] GR8NET Must be pressed before GR8NET starts initialisation and disabled GR8NET ROM completely, while engine is still active. Useful if GR8NET has ROM corrupt or ROM does not start or complete properly