CP/M-80 SYSTEM - Z-80 CARD
7.1 Z-80 CPU CARD
The Z-80 CPU board was designed to accommodate software written to run under the CP/M-80 operating system. The Z-80 card allows users to run existing Z-80 software while using all the advantages of the Sirius 1 computer system. The Z-80 board contains a Z-80B microprocessor running at 6 MHZ, 64K of dynamic RAM memory, and a Corvus hard disc interface.
The Z-80 board uses the Sirius 1 for all I/O including graphics capabilities, disc storage, and access to I/O ports. The Corvus hard disc interface allows the user to connect a Corvus 5, 10, or
20 megabyte hard disc to the Sirius 1. Up to four 20 megabyte drives may be on line at one time and up to 64 Sirius 1 computers may be networked together using the Corvus constellation
multiplexer board. High speed backup onto standard video tape is available from Corvus by ordering the corvus mirror option.
CP/M-80 is a disc operating system that manages program and data
files. CP/M-80 programs will run on a Z-80 system provided
sufficient memory is available (64K bytes max).
The Z-80 card occupies one of the available I/O port addresses. The Z-80 board comes factory set for I/O port address 0. This address may be changed if necessary. The two 10 position dip switch banks set the I/O port address for the Z-80 card.
(NOTE: When the Z-80 card hardware port address is changed, the user must also change the CP/M-80 software I/O port address for the Z-80 board by using the NEWSYS program).
The table below describes the I/O port address switch banks.
SWITCH 1 (near centre of card)
|
SWITCH 1 PIN #
1
2
3
4
5
6
7
8
9
10 |
I/O ADDRESS BIT #
0
1
2
3
4
5
6
7
8
9 |
SWITCH 2 (furthest from centre of card)
|
SWITCH 1 PIN #
1
2
3
4
5
6
7
8
9
10 |
I/O ADDRESS BIT #
10
11
12
13
14
15
RESERVED
RESERVED
RESERVED |
By typing a command, the Sirius 1 user can switch between CP/M-80 and CP/M-86 operating systems. (Note: CP/M operating system disc must be loaded to access CP/M-80 operating system.)
To load CP/M-80, from CP/M-86 type:
80<CR>
To return to CP/M-86 from CP/M-80 type:
86<CR>
Refer to the CP/M-80 User's Guide for further software information.
Note that the Z-80 card cannot be used with the MS-DOS operating system and therefore cannot be used in a hard-disc based Sirius 1 to access the hard disc.