ZiLOG Z80 Handbook page 260

CROMEMCO SOFTWARE
The Cromemco 1K monitor includes commands to examine and
modify memory, move and compare blocks of memory, read and
load paper tapes, and program 2704 and 2708 PROMs using the
BYTESAVERTM board. The monitor is supplied in the Z-1 system.
A resident 8K assembler is available in PROM, or on paper tape.
A BASIC interpreter is available in PROM, or on paper tape. This
BASIC is a special CONTROL BASIC that occupies 3K of memory
and is designed for control and automated testing applications. The
CONTROL BASIC allows the use of strings, multiple files, and sub-
routines, and also allows files to be programmed in PROMs on a
BYTESAVERTM board.
THE DIGITAL GROUP, INC.
The Digital Group offers a number of CPU boards, among them
the Motorola 6800, MOS Technology 6502, 8080A, and Z-80. All CPU
boards are interchangeable and system compatibility is maintained
at the CPU board level. A variety of system boards, peripherals, and
microcomputer system combinations are offered by the company.
System boards include a parallel I/O board, 8K static RAM, TV
Readout and Audio-Cassette Interfaces, 4K EPROM memory
board, and a Color Graphics Board. Peripheral equipment is gen-
erally housed in cabinets that match the other system cabinetry in
styling and color. Keyboards, tv monitors, cassette drives, and a
matrix printer are available. As with the other Z-80 microcomputer
manufacturers, combinations of the various system components are
offered as complete systems.
DIGITAL GROUP Z-80 CPU BOARD
As the Digital Group equipment is not S-100 bus compatible,
much of the CPU card can be devoted to logic other than that dedi-
cated to S-100 bus conversion. The Digital Group Z-80 CPU Board
contains the Z-80 microprocessor, 2K bytes of 500-nanosecond static
RAM, and 256 bytes of EPROM (1702A) containing a bootstrap
loader. The bootstrap loader would ordinarily be used to load a
small operating system from cassette which has the capability of
cassette read and write, keyboard entry, and tv display. The system
clock on the CPU board runs at 2.5 MHz. Logic is provided on the
board to support DMA operations and all three Z-80 interrupt
modes. Single step, and power on, reset are provided externally to
the board.
269