The Digital Group (Denver, Colo.)

Talk about giving your customer choices. The Digital Group offered many of the most popular CPU cards and operating systems of the day, along with a healthy selection of interfaces and peripherals. All of the company’s models had three different system buses: one each for CPU, memory, and I/O. The Digital Group built about 4,000 systems before closing in 1979.

The Bytemaster series was the last model The Digital Group produced. It was a compact design for the era, with the main CPU unit mounted in a swiveling cradle. Some company literature indicates that it was available in kit form, but other sources show only assembled models. There might have been a model without cassette or disk storage as well.

Digital Group Series 1 (1975, early micro)
Original Retail Price: $375 kit
Base Configuration: Z80 CPU, nine expansion slots, 2K RAM (10K max), video interface, I/O card
Video: 16-line x 64-column text
Important Options: 8080, 6800, or 6502 CPU; PHIMON, DISKMON, CP/M, OASIS, or MCOS; Phideck tape drive, 5.25- or 8-inch floppy disk drive, 9-inch monochrome monitor, keyboard/keypad, printer, power supply

Digital Group Series 2 (1975, early micro)
Original Retail Price: $1,095 to $2,245 kit, $1,475 to $2,695 assembled
Base Configuration: Z80A CPU, nine expansion slots, 10K RAM (64K max), video interface, keyboard/keypad, I/O card
Video: 16-line x 64-column text
Important Options: 8080, 6800, or 6502 CPU; PHIMON, DISKMON, CP/M, OASIS, or MCOS; Phideck tape drive, 5.25- or 8-inch floppy disk drive, 9-inch monochrome monitor, printer, power supply, enclosure

Digital Group Series 3 (1975, early micro)
Original Retail Price: $1,695 to $3,875 kit, $1,995 to $5,795 assembled
Base Configuration: Z80A CPU, CP/M, nine expansion slots, 18K RAM (64K max), PROM, video interface, I/O card Video: 16-line x 64-column text
Important Options: 8080, 6800, or 6502 CPU; PHIMON, DISKMON, OASIS, or MCOS; Phideck tape drive, 5.25- or 8-inch floppy disk drive, 9-inch monochrome monitor, keyboard/keypad, printer, power supply, enclosure

Digital Group Series 4: Bytemaster (1978, desktop)
Original Retail Price: $1,995 kit
Base Configuration: Z80A CPU, PHIMON or DISKMON, 18K RAM (64K max), Phideck tape drive or 5.25-inch floppy disk drive, integral 9-inch CRT, keyboard/keypad, I/O card
Video: 16-line x 64-column text
Important Options: CP/M, OASIS, or MCOS; printer

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