Dick Smith MKII System 80 Microcomputer User Manual

User Manual for Dick Smith models including: MKII System 80, MKII System 80 Microcomputer, Microcomputer

DICK SMITH SYSTEM 80 MK II (01) - Google Drive

File Info : application/pdf, 18 Pages, 2.52MB

DICK SMITH SYSTEM 80 MK II (01)

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CONTENTS

PAGE

1. INTRODUCTION .......................................................... 2
2. POWER ON PREPARATION .... ...... ... .. ...... .. .. .......... .......... ... 3 3. KEYBOARD ........................................... .-..................... 4 4. MORE ABOUT THE KEYBOARD........................................... 5 5. LOADING AND SAVING CASSETTE PROGRAM .......................... 6 6. SYSTEM RESET . . . · . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7. UTILITY - DUMB TERMINAL, HOST ··.. .. ·.. .. .. .. .. ·.·.. .. .. .. .. ·.. .. .. · 8

APPENDIX
A. TECHNICAL SPECIFICATIONS ......................... .................. 10 B. MEMORY MAP AND 1/0 MAP ............................................. 12 C. ASCII TABLE ·············································.······.·· 13

TABLE OF
CONTENTS

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The MKII System 80 microcomputer is a new generation of the MKI System 80 and is designed for professional applications. Its design philosophy is very similar to that of many other general purpose computer systems. The main unit is composed of a Z80 CPU, 16K user memory, 13K ROM, a keyboard, a cassette interface and a video interface.
Out of the 13K ROM, 12K is the Extended BASIC Interpreter which is TRS80 Levell I compatible, and 1K contains new keyboard and display routines that make the operation more handy. A dumb terminal routine and a HOST routine are built in.
· The video interface can display upper and lower case characters. Display format is 64 characters/line and 16 lines/screen. The display can automatically scrolls.
The cassette interface operates at a transfer rate of 500 baud, and TRS80 compatible cassette tapes can be loaded through the interface.
The system also has great expansion capability. Through the expansion edge, it can be connected to an expander, from which, minifloppy disk drives, printer, RS-232-C interface, etc, can be linked to the system. The expander can increase the total user memory size to 48K and provide a S-1 00 bus option for users' specific applications.

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INTRODUCTION

VDU

CASSETTE RECORDER

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PRINTER

ADDITIONAL RAM
TELEPHONE MODEM
2

RS·232-C SERIAL PORT

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Following is the procedure to set up the system.
1) Ensure the power switches of the computer and its peripherials are in the 'OFF' position.
2) Connect up the cables between the main unit, expander and the peripherials. 3) Turn on power for the peripherials first, then the computer. 4) If your system is not connected to an expander, a message 'READY?' will be displayed
on the top left corner of the screen. 5) Hit the NEWLINE key, then another READY message should appear on the bottom of
the display. 6) The computer is now in BASIC. To enable your new keyboard and display routines,
type in SYSTEM @EWLINEl 7) The computer prompts with *?. 8) Enter /12288lNEWLINEI (See Remark) 9) The computer will immediately goes back to READY. You will see a blinking cursor. 10) If minifloppy disk is hooked to the system, do step 6, 7, 8 immediately after entering
Disk Basic.
REMARK: See Section 4.4 for other entry points.
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PREB4R4TION
OFF
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ON
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READY?

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NEW LINE

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The System 80 MKII Keyboard consists of 71 keys

KEYBOARD

Special Function Keys

BREAK -break a running program and return to the Active command level.

NEWLINE -enter a line of command or data into the computer.

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- backspace, cancel the character previously entered.
-- tab, move the cursor eight po:>ition to the right. the computer echoes a [ sign which is an exponent sign used by the system.

(equivalent to ESC key of the MK I system)

[[]

- move the cursor to the beginning of next line.

(equivalent to CTR L key of the V.G.S.)

SHIFTI+---1 -delete line.

CLEAR - clear screen.

ERASE

-same as thel~ky.

ENTER -same as the NEWLINE key.

-default as-.

- defau It as "'- .

-default as ] .

- defau It as /\ .

Programmers are recommended to program the four function keys to represent preset functions for the user.

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The key functions mentioned in the previous section are the original functions without enabling the additional ROM routines, exactly the same as that of the MKI machine. Now, MKII adds three extra useful functions. They are the automatic key REPEAT, PRINTSCREEN and SHIFT-LOCK.

4.1 REPEAT KEY After pressing a key longer than one second, the computer automatically repeats entering that character until the key is released.

4.2 PRINTSCREEN

[I] - Hitting SHIFT-

P, the computer will transfer the information displayed on the

screen to the printer. If no printer is hooked, the computer will skip the printing process

instead of locking up itself in waiting.

4.3 SHIFT LOCK
The new keyboard routine has two input mode: Basic mode and Typewriter mode. Initially, the Basic mode is set. It looks like an ordinary terminal keyboard. Every keystroke gives upper case character, but with the SHIFT key depressed, it gives lower case characters. To switch the keyboard to the Typewriter mode, hit the SHIFT-[]-Okeys. Then, the cursor will change from a large block to a small one which indicates that every alphebatic character input will be of lower case. In this mode, when the SHIFT key is depressed, it gives upper case characters. However, operation of the numeric keys are the same for both modes. Hitting a numeric key with the SHIFT key depressed will always give a symbol; without SHIFT, it is a number. Switching back to Basic mode from the Typewriter mode, simply hit the SHIFT-III-a keys again. The cursor will change back to a large block.

4.4 Disable cursor flashing A flashing cursor can attract the operator's attention, however, somebody may feel it
frustrating. To disable the flashing cursor, hit SHIFT-BREAK. To enable it, hit SHIFT-BREAK
AGAIN. If you don't want a flashing cursor at the start, you can enter 12299 instead of 12288 described in step 8 of section 2.

4 MORE ABOUT
THE KEYBOARD

NOTE: Sometimes, you may want to neglect the new keyboard routine because of software compatibility. In such a case, 12294 should be entered in step 8 of section 2.

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The computer has a cassette interface which can be connected to any audio cassette recorder. The user therefore can use cassette tapes as cheapest medium for his program storage. A cassette connector is provided, and the connection is shown in the diagram.
5.1 PROGRAM LOADING
Following is the procedure for program loading. In using the INPUT# command, the procedure is similar. a) Insert a cassette into the recorder. b) Unplug the remote (blue) plug. c) Wind or Rewind the tape until at the program's beginning. d) Plug in the remote plug. e) Enter CLOAD (refer to BASIC manual if you want to specific filename). f) The computer turns on the cassette and starts searching the program. Once it is found,
two asterisks will appear at the top right corner of the screen, the one at the right will be flashing from time to time indicating that the program is loading. g) After loading finishes, the computer turns the cassette off and returns to Active Command Level.

LOADING AND S~ING OISSETTE PROG~N\.
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NOTE: Volume of the recorder should be set to medium level. If loading is unsuccessful, try to make a small adjustment on the volume. Loading machine code tape should use the SYSTEM command instead of CLOAD; users are advised to refer to chapter I of the BASIC manual.
5.2 PROGRAM SAVING
Following is the procedure for program saving. In using the PRINT# command, the procedure is similar. a) Unplug the remote (blue) plug. b) Erase about 5 seconds of the tape. c) Plug in the remote plug. d) Enter CSAVE "F", where "F" represents the filename. The user needs not to input the
cassette number since the system can only be connected to one cassette. e) The computer turns on the cassette and records the program onto the tape. No asterisk
will appear on the screen.
f) The computer goes back to Active Command Level after the saving has completed. Then, the cassette will be turned off.

0000 000 00 0

WHITE TO BLUE TO BLACK TO

MIC REMOTE EAR

min

VOLUME max

5.3 PROGRAM CHECKING
The program on a tape can be compared with that stored in the memory of the computer by entering a CLOAD? command. The operating procedure is exactly the same as that of the loading. The only difference is to type in CLOAD? instead of CLOAD. A READY message will appear when a successful comparison has completed. Otherwise, the word BAD will be displayed.
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The system must, in some cases be reset. When, for example, the machine is running in a dead loop. The Reset Switch is located at the right side of the bc.ck panel . Pressing the reset switch causes the computer to return to the 'READY' mode without changing the memory contents.
The system runs in a dead loop in the following cases: (1) loading a program from the cassette which contains an invalid file, or when the
volume of the recorder is poorly adjusted. (2) executing LPRINT or LLIST instructions without hooking up a printer to the
system or having not turned on the printer. (3) executing an inappropriate POKE instruction.
The CPU is reset everytime when the power is on. Turning the system off and on immediately is not a good practice; because it may cause improper initialization of the CPU . Therefore, the user should wait for about 15 seconds before turning on the system again.

SYSTEM RESET
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Every computer user should be very familiar with what a terminal is. It is a piece of equipment for sending data to or retrieving data from the mainframe at a remote location. Nowadays, nearly all terminals use the same interface standard, that is, RS232C. The System 80 expander also has an RS232C option. ·
Inside the additional 1K ROM, a 'dumb terminal' routine is provided. Entering the routine, the machine will switch itself into a dumb terminal. Every keystroke by the user '-:Viii be sent out in the form of ASCII code through the RS232C interface. Simultaneously, every characters received through the interface will be displayed. The keyboard functions are the same as those discussed in Section 3 and 4 except the repeat key is cancelled. User can still use the PR INTSCREEN to produce a hardcopy of the information displayed.
Another utility designed to work with Terminal routine is the Host routine. In the Host mode, resources of the Host computer, such as disk, printer, etc., will be controlled by commands through the terminal only.

UTILITY-

DUMB TERMINAL,

HOST

7.1 DUMB TERMINAL
The procedure to enter the routine is: a) Enter SYSTEM, the computer will response with'*?'.
b) Enter I 13037
c) The computer will ask 'DUPLEX? (F/H): ' ; F stands for Full duplex and H for Half duplex.
d) Enter 'F' or 'H' to select the desired mode. e) You are now in the terminal mode.
f) To exit, hit the RESET switch.
g) If a printer is connected, characters displayed will also be output to the printer.

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7.2 HOST
The HOST routine is a communication routine utilising the RS232C interface. It allows a Host computer to hook to a remote terminal. The terminal operator can input data to or retrieve information from the computer. What the terminal is doing will also be displayed on the Host screen.
Working procedure of the Host user: 1) Enter the Host mode, type in SYSTEM, the computer will display'*?', then enter/12996 2) A message "HOST ENABLE" will send from the Host to the terminal. 3) The Host computer will lock its keyboard up and wait for input from the terminal.
4) If the Host user wants to terminate the Host mode, he should hit the [I) and BREAK
Key simultaneously. 5) A message "HOST/TERMINAL DISCONNECT" will display on both the Host and the
Terminal.

Interconnection The RS232C signal of the Host and Terminal should be connected in the following way:

-H-os-t

RxD

TxD

RTS

Terminal
TxD RxD CTS

NOTE: The Host entry point 12996 has no line feed on carriage return. If you are using a terminal with no auto line feed. Please enter the Host by 12999.

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{1) ELECTRICAL CHARACTERISTICS
POWER CONSUMPTION CASSETTE INPUT LEVEL COMPUTER OUTPUT RECORDING LEVEL REMOTE SWITCHING CAPACITY VIDEO OUTPUT

- 25W (MAX.) - 1 V peak to peak - 0.3 V peak to peak - 0.5 A max at 6 V DC - 2V peak to peak
(Negative sync pulse)

APPENDIX A TECHNICAL
SPECIF~TON

{2) CONNECTORS PIN ASSIGNMENTS
DIN JACK PIN CONNECTIONS FOR ADDITIONAL CASSETTE ·1- REMOTE 2 - SIGNAL GROUND 3 - REMOTE 4 - INPUT 5 - OUTPUT
DIN JACK PIN CONNECTIONS FOR VIDEO INTERFACE
1 - +5 v
4 - VIDEO OUTPUT 5 - GROUND
DIN JACK VIEWED FROM REAR SIDE OF THE SYSTEM
EXPANSION PIN EDGE VIEWED FROM REAR SIDE
10
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PIN CONNECTIONS FOR EXPANSION INTERFACE

SIGNAL

DESCRIPTION

GND

GROUND

GND

GROUND

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+5V SUPPLY

A15

A14

NO CONNECTION

SIGNAL
A10 A13 A 11 A12 PHI PINT NC NC PHLDA - PHA-NTOM HALT PWAIT IORQ PHOLD WR RD CCDBS/STADBS MREQ DODBS/ADDBS M1 RESET RFSH NMI GND GND

DESCRIPTION

1. 79 MHz clock

INTERRUPT

NO CONNECTION

PROCESSOR HOLD ACKNOWLEDGE

PHANTOM

HALT ACKNOWLEDGE

PROCESSOR WAIT

INPUT/OUTPUT REQUEST

PROCESSOR HOLD

PROCESSOR WRITE

PROCESSOR READ

CONTROL AND STATUS BUS DISABLE

MEMORY REQUEST

DATA AND ADDRESS BUS Dl SABLE

FIRST STATE OF INSTRUCTION CYCLE

CPU RESET

DYNAMIC MEMORY REFRESH

NON-MASKABLE INTERRUPT

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1.1

MEMORY MAP
FFFF
7FFF
3C00-3FFF 3800-3BFF 3000-33FF
2FFF 0000
l/0 PORT ASSIGNMENT
CASSETTE INTERFACE- FF, FE PRINTER INTERFACE- FD
12

FOR EXPANSION

APPENDIX B
MEMORY MAP AND .I/0 MAP

16K RAM
VIDEO DISPLAY MEMORY KEYBOARD ADDITIONAL ROM
BASIC INTERPRETER

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0000

0001

2 0010

3 0011

0100

0101

0110

7 0111

1000

1001

A 1010

B 1011

C' 1100

D 1101

E 1110

1111

0 000
BREAK
BS
FF
CR

1 001

010 011

100 101

110 111

SP 0 ®

A a

t+ 3 c s c s

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APPENDIX C ASCII TABLE

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References

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