User Manual for the System 80 MkII business
Contents
1. SYSTEM 80 MK IL USER S MANUAL CONTENTS PAGE TABLE OF 1 INTRODUCTION mE AS 2 CONTENTS Z POWER UN PHEPABATICN eo nn one 3 3 KEYBOARD 4 4 MORE ABOUT THE KEYBOARD 5 5 LOADING AND SAVING CASSETTE PROGRAM 6 MESET TOT CC ODDS 7 7 UTILITY DUMB TERMINAL HOST APPENDIX A TECHNICAL SPECIFICATIONS een 10 B MEMORY MAP AND 1 0 MAP 12 C ASCII TABLE wol _ o ans 13 The MKII System 80 microcomputer is a new generation of the MKI System 80 and is designed for professional applications lts 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 Level 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 automa2. 10 If minifloppy disk is hooked to the system do step 6 7 8 immediately after entering MONITOR Disk Basic NEW LINE REMARK See Section 4 4 for other entry points 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 backspace cancel the character previously entered gt tab move the cursor eight position to the right E the computer echoes a sign which is an exponent sign used by the system equivalent to ESC key of the MK system move the cursor to the beginning of next line equivalent to CTRL key of the V G S SHIFT delete line CLEAR clear screen ERASE same as the lt key ENTER same as the NEWLINE key F1 default as F2 default as F3 default as 7 F4 default as Programmers are recommended to program the four function keys to represent preset functions for the user 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 automaticall
3. 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 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 will 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 PRINTSCREEN to produce a hardcopy of the information displayed Another
4. 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 7 1 DUMB TERMINAL The procedure to enter the routine is a Enter SYSTEM the computer will response with b Enter 13037 c The computer will ask DUPLEX 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 printer is connected characters displayed will also be output to the printer UTILITY DUMB TERMINAL HOST 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 wil 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 and BREAK Key simultaneously 5 A message HOST TERMINAL DISCONNECT will display on both the Host and the Terminal Interc
5. 2299 instead of 12288 described in step 8 of section 2 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 MORE ABOUT THE KEYBOARD The computer has a cassette interface which can be connected to any audio cassette LOAD ING 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 CASSETTE PROGRAM 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 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 m 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 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 comma
6. MASKABLE INTERRUPT SS O N gt 5V SUPPLY NO CONNECTION 11 MEMORY MAP FFFF 7FFF 3C00 3F FF 3800 3BFF 3000 33F F 2FFF 0000 MO PORT ASSIGNMENT CASSETTE INTERFACE FF FE PRINTER INTERFACE FD 12 FOR EXPANSION 16K RAM VIDEO DISPLAY MEMORY KEYBOARD ADDITIONAL ROM BASIC INTERPRETER APPENDIX B MEMORY MAP AND MAP APPENDIX C ASCII TABLE 13 NOTES NOTES NOTES yt mme X
7. nd instead of CLOAD users are advised to refer to chapter 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 Plugin 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 min VOLUME max 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 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 WHITE TO MIC BLUE TO REMOTE BLACK TO EAR That is my heart beat 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 back panel Pressing the reset switch causes the computer to return to the READY mode without changing the memory contents The
8. onnection The RS232C signal of the Host and Terminal should be connected in the following way Host Terminal RxD TxD TxD to RxD RTS 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 10 1 ELECTRICAL CHARACTERISTICS POWER CONSUMPTION CASSETTE INPUT LEVEL COMPUTER OUTPUT RECORDING LEVEL REMOTE SWITCHING CAPACITY VIDEO OUTPUT 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 5V 4 VIDEO OUTPUT b GROUND DIN JACK VIEWED FROM REAR SIDE OF THE SYSTEM EXPANSION PIN EDGE VIEWED FROM REAR SIDE APPENDIX A TECHNICAL SPECIFICATIONS 20W MAX 1 V peak to peak 0 3 V peak to peak max at 6 V DC 2V peak to peak Negative sync pulse PIN CONNECTIONS FOR EXPANSION INTERFACE PIN SIGNAL SIGNAL DESCRIPTION DESCRIPTION GROUND GROUND 1 79 MHz clock INTERRUPT NO CONNECTION 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 DISABLE FIRST STATE OF INSTRUCTION CYCLE CPU RESET DYNAMIC MEMORY REFRESH NON
9. tically 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 100 bus option for users specific applications VDU CASSETTE RECORDER MAIN UNIT DISK DRIVE PRINTER RS 232 C SERIAL PORT ADDITIONAL TELEPHONE MODEM INTRODUCTION a This is my family e ARA POWER ON PREPARATION 1 Ensure the power switches of the computer and its peripherials are in the OFF sura position 2 Connectup 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 NEWLINE 7 The computer prompts with 267 8 Enter 12288 NEWLINE See Remark 9 The computer will immediately goes back to READY You will see a blinking cursor
10. y repeats entering that character until the key is released 4 2 PRINTSCREEN 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 4 Q keys 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 W Q keys again The cursor wil 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 1
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