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GR8BIT: the Real Engineering Experience
E-mail: infoatgr8bit.ru [S]
Phone: +7 916 440 6541

[JP] 日本のディーラー:
株式会社エイチアンドエス (H&S Inc.)

GR8BIT specifications

Technical
specification
Documentation Kit (GR8BOX)
specifications
GR8BUS
master
Certified
devices

GR8BIT Platform Technical Specifications

Specifications table is continuously updated as more and more devices are being certified for the platform.

Compatibility
  • MSX2 standard (fully compatible)
  • MSX2+ standard (partially compatible, full compatibility requires V9958)
  • ATX form factor
Power management
  • ATX power management compliant
  • Software power off function
CPU
  • Z80 (4-20MHz), compatible or emulation board (3.3V)
  • Multi-processor capable
Main system memory
  • 1MiB (SRAM), upgradeable to 4MiB
  • Further extensions to 1GiB (DRAM)
Video subsystem
  • V9938 VDP, 128KiB VRAM, direct video memory access
  • Composite TV output (grayscale), RGB NTSC output
Storage interfaces
  • FDD: up to two; Formats: «Standard 1.44» (9 FAT sectors), «Compatible 1.44» (3 FAT sectors) and «Legacy 720» (3 FAT sectors)
  • HDD: up to two ATA (IDE) storage devices, with max 8 logical volumes (LVOLs), 2 active at a time; built-in GR8STORM™ utility
  • Micro-SD card interface (using GR8BUS master board, read only)
  • Any compatible storage device in the external slots
Input interfaces
  • PS/2 keyboard interface (requires keyboard controller installed)
  • Compatible keyboard interface
I/O ports and interfaces
  • Seven (7) GR8BUS internal slots
  • Two (2) expandable external slots (1 and 2)
  • Two (2) GR8BUS adaptor boards for internal cartridge connection
  • Advanced printer port / parallel datacomm port
  • Two (2) compatible joystick ports / general I/O ports
Multimedia capabilities
  • 3 channel programmable sound generator
  • Tunable square waveform generator
  • Additional 5 programmable channels when using SCC
  • 8-bit Covox in parallel port
Networking capabilities
  • GR8BUS master's W5100-based interface
Software (downloadable from the internet)
  • Language pack; Languages: JA, RU, Eng; Support for PS/2 keyboard layouts. See "Downloads" section.
  • Gaming (list, database, more than 320 titles)
  • Software development (ASCII C, ASCII Assembler, BASIC, Fortran, Cobol, whatever, database)
  • Operating systems (MSX-DOS, CP/M, SymbOs)
  • Emulation (BlueMSX, OpenMSX)

Technical
specification
Documentation Kit (GR8BOX)
specifications
GR8BUS
master
Certified
devices
Top

GR8BIT Documentation

GR8BIT package contains a set of comprehensive documentation. Main manual is called GR8BOOK (with pictures and images), there're also your license sheets, full inventory grouped by the board and component type. It may also contain Quality and Errata sheet which lists known ways to improve your GR8BIT functionality, and prevents you from making mistakes during assembly, troubleshooting and platform operation.

GR8BOOK Part I
GR8BOOK Part I: Principles of Operation (65 pages)
  GR8BOOK Part II
GR8BOOK Part II: Assembling your GR8BIT (49 pages)
  GR8BOOK Part III
GR8BOOK Part III: Starting and booting your GR8BIT (17 pages)
  GR8BOOK Part IV
GR8BOOK Part IV: Component reference (16 pages)
  GR8BOOK Part V
GR8BOOK Part V: Circuit diagrams, PCB layouts and pin-outs (54 pages)

There were two books added recently:


Technical
specification
Documentation Kit (GR8BOX)
specifications
GR8BUS
master
Certified
devices
Top

GR8BIT Kit (GR8BOX) Specifications

We reserve right to change the kit specifications without notice for the purpose of consumer experience improvement.

Component~ Qty Component~ Qty
Capacitors190 Connectors55
Semiconductors18 Integrated circuits103
Jumpers25 Crystal resonators6
Resistors106 Resistor packs20
Slots11 Sockets103
Other18 Total:655

  • Main system ROM microcode (48KiB) is included inside the GR8BOX (programmed within the main system EEPROM chip) on the MSX license terms and conditions, to be used within GR8BIT only. See Licensing section for more information.
  • PS/2 keyboard controller microcode is included (programmed) within GR8BIT keyboard microcontroller.
  • Advanced storage controller microcode is included, supports floppy disk storage media at this time
  • Compatible keyboard is not included
  • RTC battery (CR2032) is not included
  • RCA cables are not included
  • RGB cable is not included (DB9 male connector is included)
PCBAreaSheetTotal
Main board115.2 in²1 
Video board51.7 in²1 
  1172.2 in²
 
Z80 CPU board28.8 in²2 
Memory board28.8 in²2 
Slot board14.6 in²2 
Keyboard board3.3 in²2 
  277 in²
 
I/O board51.7 in²3 
GR8BUS adaptor board (2)6.5 in²3 
  367.2 in²
GR8BIT PCB sheet 1
GR8BIT PCB sheet 1
GR8BIT PCB sheet 2
GR8BIT PCB sheet 2
GR8BIT PCB sheet 3
GR8BIT PCB sheet 3

GR8BOX  

GR8BOX properties

DimensionsWeight
W, cmL, cmH, cm(kg)
35276.51.65

Technical
specification
Documentation Kit (GR8BOX)
specifications
GR8BUS
master
Certified
devices
Top

GR8BUS master board

GR8BUS master board is not intended to be assembled in the field. It introduces significant opportunities in extending the functionality of the GR8BIT platform, and provides huge field for learning and fun.

Implementations have tested to date:
  • Overall board functionality: flashing diagnostic LEDs
  • 5 independent DACs: each as Covox device (deliverable: quality of the sound, using COVOX.COM)
  • Internal M9K memory: provision of the 64KBytes of mapped RAM to the GR8BIT (deliverable: GR8BIT passes memory and mapper TESTRAM.COM's tests)
  • Onboard SDRAM chip, 32MBytes (implementation of 33MBytes RAM GR8BIT configuration)
  • Konami SCC implementation using M9K memory block and embedded multiplier
GR8BUS master product is not provided within GR8BOX. It is separate product.
GR8BUS master board, side B
GR8BUS master
board, side B
GR8BUS master board, side A
GR8BUS master
board, side A

Technical
specification
Documentation Kit (GR8BOX)
specifications
GR8BUS
master
Certified
devices
Top

Certified devices

Logo Description and link Owner(s) / Developer(s) Support condition
Nowind Nowind storage interface
The interface is an MSX cartridge that allows you to connect your MSX to a PC using a USB connection
Wilmans, J., Dekker, A. (NL) KB0002
Supported in the converter board and in the slot board


GR8BIT™, GR8BOOK™, GR8BUS™, GR8BOX™ and GR8STORM™ are trademarks copyright © 2010-2014 Eugeny Brychkov. For copyright statement, privacy and cookie matters, and credits please refer to our policies.