GR8BIT specifications

GR8BIT Platform Technical Specifications

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

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: Principles of Operation (65 pages)

GR8BOOK Part II: Assembling your GR8BIT (49 pages)

GR8BOOK Part III: Starting and booting your GR8BIT (17 pages)

GR8BOOK Part IV: Component reference (16 pages)

GR8BOOK Part V: Circuit diagrams, PCB layouts and pin-outs (54 pages)

There were two books added recently:

• Part VI: Additional devices
• Part VII: Discontinued designs

GR8BIT Kit (GR8BOX) Specifications

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

PCB Area Sheet Total Main board 115.2 in² 1   Video board 51.7 in² 1       1 172.2 in²   Z80 CPU board 28.8 in² 2   Memory board 28.8 in² 2   Slot board 14.6 in² 2   Keyboard board 3.3 in² 2       2 77 in²   I/O board 51.7 in² 3   GR8BUS adaptor board (2) 6.5 in² 3       3 67.2 in²

GR8BIT PCB sheet 1

GR8BIT PCB sheet 2

GR8BIT PCB sheet 3

GR8BOX properties Dimensions Weight W, cm L, cm H, cm (kg) 35 27 6.5 1.65

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 A

Certified devices

Logo	Description and link	Owner(s) / Developer(s)	Support condition
	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