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X68000

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The X68000 (Japanese: エックス ろくまんはっせん, Hepburn: Ekkusu Rokuman Hassen) is a home computer created by Sharp Corporation. It was first released in 1987 and sold only in Japan.

X68000
X68000ACE-HD
DeveloperSharp Corporation
ManufacturerSharp Corporation
TypeHome computer[1]
Release date1987[1]
Lifespan1987-1996
Discontinued1996
MediaFloppy disk
Operating systemHuman68k, NetBSD, OS-9
CPUMotorola 68000 family
Memory1 to 12 MB of RAM
Display14" CRT
256×256 to 1024×1024 pixels
16 bits
GraphicsVINAS 1 2, VSOP, CYNTHIA / Jr, RESERVE
SoundYamaha YM2151
OKI MSM6258
Controller inputD-pad, Keyboard, Mouse
Power100V AC 50/60 Hz
PredecessorX1
Main processor board of original 1987 CZ-600C model
Video board of original 1987 CZ-600C model
Cynthia sprite chip in the original 1987 CZ-600C model
VSOP Video processing chip in the original 1987 CZ-600C model
Sharp X68000 XVI front and back
Sharp X68030 and X68000 Expert

The initial model has a 10 MHz Motorola 68000 CPU, 1 MB of RAM, and lacks a hard drive. The final model was released in 1993 with a 25 MHz Motorola 68030 CPU, 4 MB of RAM, and optional 80 MB SCSI hard drive. RAM in these systems is expandable to 12 MB, though most games and applications do not require more than 2 MB.

The X68000 has graphics hardware similar to arcade video games of the late-1980s, with custom coprocessors supporting scrolling, tiled backgrounds, and large numbers of sprites. Sound is supplied through multiple sound chips supporting 8 channels of FM synthesis and one channel of adaptive differential pulse-code modulation audio, which are mixed down to 2 analog stereo channels via a DAC chip. As such, video gaming was a major use of the X68000.

Operating system

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The X68k runs an operating system called Human68k which was developed for Sharp by Hudson Soft. An MS-DOS-workalike, Human68k features English-based commands very similar to those in MS-DOS; executable files have the extension .X. Versions of the OS prior to 2.0 have command line output only for common utilities like "format" and "switch", while later versions included forms-based versions of these utilities. At least three major versions of the OS were released, with several updates in between.

Early models have a GUI called "VS" or "Visual Shell"; later ones were originally packaged with SX-WINDOW. A third GUI called Ko-Window exists with an interface similar to Motif. These GUI shells can be booted from floppy disk or the system's hard drive. Most games also boot and run from floppy disk; some are hard disk installable and others require hard disk installation.

Since the system's release, software such as Human68k itself, console, SX-Window C compiler suites, and BIOS ROMs have been released as public domain software and are freely available for download.[2] Other operating systems available include OS-9 and NetBSD for X68030.[3][4]

Case design

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The X68000 has two soft-eject 5.25-inch floppy drives, or in the compact models, two 3.5-inch floppy drives, and a very distinctive case design of two connected towers, divided by a retractable carrying handle. This system was also one of the first with a software-controlled power switch; pressing it signals the system's software to save and shut down. The screen fades to black and the sound fades to silence before the system turns off.

The system's keyboard has a mouse port built into either side. The front of the computer has a headphone jack, volume control, joystick, keyboard and mouse ports. The top has a retractable carrying handle only on non-Compact models, a reset button, and a non-maskable interrupt (NMI) button. The rear has a variety of ports, including stereoscopic output for 3D goggles, FDD and HDD expansion ports, and I/O board expansion slots.

Display

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The monitor supports horizontal scanning rates of 15, 24, and 31 kHz and functions as a cable-ready television (NTSC-J standard) with composite video input. It was a high quality monitor for playing JAMMA-compatible arcade boards due to its analog RGB input and support for all three horizontal scanning rates used with arcade games.

Disk I/O

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Early machines use the rare Shugart Associates System Interface (SASI) for the hard disk interface; later versions adopted the industry-standard Small Computer System Interface (SCSI). Per the hardware's capability, formatted SASI drives can be 10, 20 or 40 MB in size and can be logically partitioned as well.

Human68K does not support the VFAT long filenames standard of modern Windows systems, but it supports 18.3 character filenames instead of the 8.3 character filenames allowed in the FAT filesystem. By default, Human68K will not consider any additional characters beyond the first 8 without the use of a special driver, therefore files and folders that are named the same when viewed through a 8.3 filename but different when viewed through a 18.3 filename will be considered the same. Human68K is case sensitive and allows lower case and Shift JIS encoded Kanji characters in filenames, both of which cause serious problems when a DOS system tries to read such a directory. If a X68000 user restricts themselves to use only filenames according to the 8.3 characters scheme of DOS, using only Latin upper case characters, then a disk written on the X68000 is fully compatible with other Japanese standard platforms like e.g. the NEC PC-9800, the Fujitsu FMR and FM Towns computers. The Japanese standard disk format used by the X68000 is: 77 tracks, 2 heads, 8 sectors, 1024 bytes per sector, 360 rpm (1232 KiB).

Expansion

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Many add-on cards were released for the system, including networking (Neptune-X), SCSI, memory upgrades, CPU enhancements (JUPITER-X 68040/060 accelerator), and MIDI I/O boards. The system has two joystick ports, both 9-pin male and supporting Atari standard joysticks and MSX controllers. Capcom produced a converter that was originally sold packaged with the X68000 version of Street Fighter II that allowed users to plug in a Super Famicom or Mega Drive controller into the system. The adapter was made specifically so that users could plug in the Capcom Power Stick Fighter controller into the system.

List of X68000 series

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Release Date model name model number CPU body memory Expansion
I/O slot 		FDD HDD Bundle
software
color shape SASI SCSI size
1987/03 X68000 CZ-600C Hitachi HD68HC000
10 MHz
(Motorola 68000 clone) 		Gray/Black Tower 1 MB 2 5¼ ×2 o – – Human68k ver1.0 (OS)
Gradius (Game)
1988/03 X68000 ACE CZ-601C Gray/Black Tower 1 MB 2 5¼ ×2 o – – Human68k ver1.01
X68000 ACE-HD CZ-611C 020 MB
1989/03 X68000 EXPERT CZ-602C Gray/Black Tower 2 MB 2 5¼ ×2 o – – Human68k ver2.0
X68000 EXPERT-HD CZ-612C 040 MB
X68000 PRO CZ-652C Gray/Black Horizontal 1 MB 4 5¼ ×2 o – – Human68k ver2.0
X68000 PRO-HD CZ-662C 040 MB
1990/03 X68000 EXPERT II CZ-603C Gray/Black Tower 2 MB 2 5¼ ×2 o – – Human68k ver2.0
SX-Window ver2.0
X68000 EXPERT II-HD CZ-613C 040 MB
1990/04 X68000 PRO II CZ-653C Gray/Black Horizontal 1 MB 4 5¼ ×2 o – – Human68k ver2.0
SX-Window ver2.0
X68000 PRO II-HD CZ-663C 040 MB
1990/06 X68000 SUPER-HD CZ-623C Titan Black Tower 2 MB 2 5¼ ×2 – o 080 MB Human68k ver2.01
SX-Window ver2.0
1991/01 X68000 SUPER CZ-604C –
1991/05 X68000 XVI CZ-634C Motorola 68000
16 MHz 		Titan Black Tower 2 MB 2 5¼ ×2 – o – Human68k ver2.02
SX-Window ver2.0
X68000 XVI-HD CZ-644C 080 MB
1992/02 X68000 Compact CZ-674C Gray mini Tower 2 MB 2 3½ ×2 – o – Human68k ver2.03
SX-Window ver2.0
1993/03 X68030 CZ-500 Motorola MC68EC030
25 MHz 		Titan Black Tower 4 MB 2 5¼ ×2 – o – Human68k ver3.0
SX-Window ver3.0
X68030-HD CZ-510 080 MB
1993/05 X68030 Compact CZ-300 Titan Black mini Tower 4 MB 2 3½ ×2 – o – Human68k ver3.02
SX-Window ver3.0
X68030 Compact-HD CZ-310 080 MB
(Cancelled) Power X (provisional name) CZ-xxxx IBM PowerPC 601
66 MHz 		Titan Black Tower 8 MB 2 unknown – o 240 MB SX-Window ver4.0

List of X68000 games

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Main article: List of X68000 games

Technical specifications

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Processors

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Memory

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  • ROM: 1 MB (128 kB BIOS, 768 kB Character Generator)
  • Main RAM: 1-4 MB (expandable up to 12 MB)
  • VRAM: 1056 kB
    • 512 kB graphics
    • 512 kB text
    • 32 kB sprites
  • SRAM: 16 kB static RAM

Graphics

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  • Color palette: 65,536[5] (16-bit RGB high color depth)[9]
  • Maximum colors on screen: 65,536 (in 512×512 resolution)
  • Screen resolutions (all out of 65,536 color palette)[8][9]
    • 256×240 pixels @ 16 to 65,536 colors
    • 256×256 pixels @ 16 to 65,536 colors
    • 512×240 pixels @ 16 to 65,536 colors
    • 512×256 pixels @ 16 to 65,536 colors
    • 512×512 pixels @ 16 to 65,536 colors
    • 640×480 pixels @ 16 to 64 colors
    • 768×512 pixels @ 16 to 64 colors
    • 1024×1024 pixels @ 16 to 64 colors
  • Graphics hardware (VINAS 1 2, VSOP, CYNTHIA / Jr, RESERVE): Hardware scrolling, priority control, super-impose, dual tilemap background layers,[8] sprite flipping[9]
  • Graphical planes: 1-4 bitmap planes, 1-2 tilemap planes, 1 sprite plane[9][10]
    • Bitmap planes[5][9]
      • 1 layer: 512×512 resolution @ 65,536 colors on screen, or 1024×1024 resolution @ 64 colors on screen (out of 65,536 color palette)
      • 2 layers: 512×512 resolution @ 256 colors on screen per layer (512 colors combined) (out of 65,536 color palette)
      • 4 layers: 512×512 resolution @ 16 colors on screen per layer (64 colors combined) (out of 65,536 color palette)
    • BG tilemap planes[9][10]
      • BG plane resolutions: 256×256 (2 layers) or 512×512 (1 layer)
      • BG chip/tile size: 8×8 or 16×16
      • Colors per BG layer: 256 (out of 65,536 color palette)
      • BG colors on screen: 256 (1 layer) or 512 (2 layers), out of 65,536 color palette
      • BG tiles on screen: 512 (16×16 tiles in 256×256 layers) to 4096 (8×8 tiles in 512×512 layer)
    • Sprite plane[5][9][10]
      • Sprite count: 128 sprites on screen, 32 sprites per scanline, 256 sprite patterns in VRAM (can be multiplied up to 512 sprites on screen with scanline raster interrupt method[11])
      • Sprite size: 16×16
      • Colors per sprite: 16 colors per palette, selectable from 16 palettes (out of 65,536 color palette)
      • Sprite colors on screen: 256 (out of 65,536 color palette)
      • Sprite tile size: 8×8 or 16×16
      • Sprite tile count: 128 (16×16) to 512 (8×8) on screen, 256 (16×16) to 1024 (8×8) in VRAM

Other specifications

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  • Expansion: 2 card slots (4 on Pro models)
  • I/O Ports:
    • 2 MSX compatible joystick ports
    • Audio IN / OUT
    • Stereo scope/3D goggles port
    • TV/monitor Control
    • RGB/NTSC Video Image I/O
    • Expansion (2 slots)
    • External FDD (up to 2)
    • SASI/SCSI (depending on model)
    • RS232 serial port
    • Parallel port
    • Headphone and microphone ports
  • Floppy Drives:
    • Two soft-eject 5.25″ floppy drives, 1.2 MB each
    • Two 3.5″ floppy drives, 1.44 MB each (compact models)
  • Hard Disk: 20-80 MB SASI/SCSI (depending on model)
  • Operating Systems: Human68k (MS DOS-alike developed by Hudson), SX-Windows GUI
  • Power Input: AC 100 V, 50/60 Hz
  • Weight: ~8 kg (~10 kg Pro)

Optional upgrades

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  • Upgradable CPU:[12]
    • HARP: Motorola 68000 @ 20 MHz
    • REDZONE: Motorola 68000 @ 24 MHz
    • X68030 D'ash: Motorola 68030 @ 33 MHz
    • Xellent30: Motorola 68030 @ 40 MHz
    • HARP-FX: Motorola 68030 @ 50 MHz
    • Xellent40: Motorola 68040 @ 33 MHz
    • 060Turbo: Motorola 68060 @ 50 MHz
    • Jupiter-EX: Motorola 68060 @ 66 MHz
    • Venus-X/060: Motorola 68060 @ 75 MHz
  • Additional CPU:[12]
    • CONCERTO-X68K: NEC V30 @ 8 MHz, with 512 kB RAM
    • VDTK-X68K: NEC V70 @ 20 MHz, with 2 MB DRAM and 128 kB SRAM
  • FPU (floating point unit) coprocessor:[12][13]
    • Sharp CZ-6BP1
    • Sharp CZ-6BP2: Motorola 68881 @ 16 MHz
    • Sharp CZ-5MP1: Motorola 68882 @ 25 MHz
    • Xellent30: Motorola 68882 @ 33 MHz
    • Tsukumo TS-6BE6DE: Motorola MC68882, with 6 MB RAM
  • Sound card:[12][14]
  • Graphics accelerator & sound card: Tsukumo TS-6BGA[15][16][17]
    • Graphics chip: Cirrus Logic CL-GD5434 (1994)
    • VRAM: 2 MB (2048 kB) 64-bit DRAM
    • Color palette: 16,777,216 (24-bit RGB true color depth) and alpha channel (RGBA)
    • Maximum colors on screen: 16,777,216
    • Maximum resolution: 2048×1024 pixels
    • Screen resolutions (all out of 16,777,216 color palette)
      • 768×512 pixels @ 32,768 to 16,777,216 colors
      • 800×600 pixels @ 32,768 to 16,777,216 colors
      • 1024×512 pixels @ 32,768 to 16,777,216 colors
      • 1024×768 pixels @ 32,768 to 16,777,216 colors
      • 1024×1024 pixels @ 32,768 colors
      • 1280×1024 pixels @ 256 colors
      • 2048×1024 pixels @ 256 colors
    • Graphical capabilities: 64-bit GUI acceleration, blitter, bit blit
    • Audio capabilities: 16-bit stereo PCM @ 48 kHz sampling rate
  • Hard disk drive storage:[13]
    • Sharp CZ-5H08: 80 MB
    • Sharp CZ-68H: 81 MB
    • Sharp CZ-5H16: 160 MB

Legacy

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In 2022, ZUIKI Inc. revealed a teaser for a new mini console called the X68000 Z, a miniaturized version of the X68000.[18][19]

See also

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  • X1, the predecessor of the X68000

References

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  1. ^ a b Szczepaniak, John; McFerran, Damien (4 January 2023). "Best Sharp X68000 Games: 20 Titles We Want On The X68000 Z Mini". Time Extension. Hookshot Media. Retrieved 29 July 2024.
  2. ^ "Sharp X68000 - The Japanese Amiga Alternative - Everything Amiga".
  3. ^ "OS-9/X68k Page". web.kyoto-inet.or.jp (in Japanese). Retrieved 2023-08-25.
  4. ^ "NetBSD/x68k". wiki.netbsd.org. Retrieved 2023-08-25.
  5. ^ a b c d Japan, Information Processing Society of. "X68000-Computer Museum". museum.ipsj.or.jp. Archived from the original on 2014-10-02. Retrieved 2014-09-07.
  6. ^ "X68000 an NFC Technical Gallery". Archived from the original on 2014-09-03. Retrieved 2014-09-12.
  7. ^ "x68000:custom_chips [NFG Games GameSX]". www.gamesx.com. Archived from the original on 2014-09-08. Retrieved 2014-09-08.
  8. ^ a b c "Sharp x68000". Archived from the original on 2014-09-07. Retrieved 2014-09-07.
  9. ^ a b c d e f g "mame/x68k.c at master · mamedev/mame · GitHub". GitHub. Archived from the original on 21 November 2014.
  10. ^ a b c "x68000:screen_control [NFG Games GameSX]". gamesx.com. Archived from the original on 2014-09-07. Retrieved 2014-09-07.
  11. ^ Yoshida, Koichi (12 September 2001). "超連射68K 開発後記". Yosshin's web page (in Japanese). Archived from the original on 12 May 2019. Retrieved 2020-03-06. (Translation by Shmuplations. Archived 2019-07-02 at the Wayback Machine).
  12. ^ a b c d "Google Translate". translate.google.com.
  13. ^ a b "x68000:x68000_product_catalog [NFG Games GameSX]". www.gamesx.com. Archived from the original on 2015-09-24. Retrieved 2015-10-23.
  14. ^ "illusionware.it - Sharp X68000 Overview". www.illusionware.it. Archived from the original on 2015-09-24. Retrieved 2015-10-23.
  15. ^ "x68000:ts-6bga_-_pcm_sound_board_graphics_accelerator [NFG Games GameSX]". www.gamesx.com. Archived from the original on 2014-09-08. Retrieved 2014-09-07.
  16. ^ "Data" (PDF). x68k.net. Archived (PDF) from the original on 2014-09-07. Retrieved 2014-09-07.
  17. ^ "Cirrus Logic CL-GD5434-HC-B". Archived from the original on September 8, 2014. Retrieved September 8, 2014.
  18. ^ "「X68000」の"ミニ"を開発中？ 瑞起がX68000のロゴ入りキーボードと，二連サイドボタンが搭載されたマウスの画像を公開".
  19. ^ "X68000が登場してから35年".
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