Radio Shack TRS-80 Manuale utente

TRS-80®

MICRO COLOR COMPUTER

MODEL MC-10

Catalog Number 26-3011

CUSTOM MANUFACTURED FOR RADIOSHACK, A DIVISION OF TANDY CORPORATION

26-3011

– 2 –

TABLE OF CONTENTS

SECTION PAGE

NUMBER NUMBER

I SYSTEM DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

II SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

III DISASSEMBLY / REASSEMBLY - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

IV THEORY OF OPERATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

CPU-6803 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Reset Circuit - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

ROM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Cassette Interface - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Detailed Tape Format Information - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

RS-232C Interface - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14

I/O Connector - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Keyboard Interface - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

TV Switch Box - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Power Supply - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

VDG - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

Device Selection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

System Timing - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

RAM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

Modulator - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

V TROUBLESHOOTING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

VI PARTS LIST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 25

VII PRINTED CIRCUIT BOARDS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 30

VIII IC INTERNAL CONNECTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 33

IX SCHEMATlC DlAGRAM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44

X EXPLODED VlEW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46

[ Editor’s Note: I would also like to express my thanks to RadioShack for permit-

ting the distribution of this manual. I hope you find it useful. I have found a few

typos and inconsistencies in the Service Manual that I have noted in an italized

font like this. JMM.]

– 3 –

SECTION I

SYSTEM DESCRIPTION

– 4 –

SYSTEM DESCRIPTION

The MC-10 Micro Color Computer is a fully

expandable microprocessor system. It is com-

posed of a 6803 central processing unit, 4K of

static RAM, 8K of Basic ROM, and a 6847 video

display generator. The microcomputer is also

interfaced to a 48-key keyboard and provides

the logic to execute a 1500 Baud cassette inter-

face and a RS-232 serial interface. The system

operates on a common color burst frequency

of 3.579545 MHz. This main clock is divided by

4 in the CPU to yield an operating speed of 0.89

MHz.

In operation, the 4K of static RAM is shared

between the CPU and the video display gene-

rator. This time multiplexing is based on the

processor clock E. The CPU will be granted

access to the RAM (upon request) only during

the high state of E. This allows efficient usage

of the RAM with no waiting by the CPU and no

visible conflict on the display.

The 6847 VDG provides a display on a TV

screen of 32 characters by 16 rows. It also

allows a 64 x 32 semigraphics mode with eight

colors. This display utilizes a minimum amount

of system RAM (512 bytes).

The final elements of the microcomputer sys-

tem are the I/O devices. The MC-10 is interfaced

to a 48-key keyboard which generates the

codes for upper and lower case characters,

graphics symbols, and single stroke keyboard

entry. The computer also provides a 1500 baud

cassette interface for fast and reliable data and

program storage and a limited signal RS-232C

interface. The RS-232C interface allows either a

printer or a modem to be used with the MC-10.

– 5 –

SYSTEM BLOCK DIAGRAM

– 6 –

MEMORY MAP

Hex Address

C000 - FFFF 16K ROM (only 8K used)

9000 - BFFF 16K I/O Slot (Keyboard and VDG control)

4000 - 8FFF 16K RAM (4K - 20K used)

0100 - 3FFF Not Used

0080 - 00FF RAM internal to the 6803

0015 - 007F Not Used

0014 RAM Control Register

0013 Not Used

0012 Not Used

0011 Not Used

0010 Not Used

000F Port 3 Control and Status Register

000E Input Capture Register (low byte)

000D Input Capture Register (high byte)

000C Output Compare Register (low byte)

000B Output Compare Register (high byte)

000A Counter (low byte)

0009 Counter (high byte)

0008 Timer Control and Status Register

0007 Not Used

0006 Not Used

0005 Not Used

0004 Not Used

0003 Miscellaneous I/O Data Register

0002 Keyboard Output Lines

0001 Data Direction Register for miscellaneous I/O

0000 Data Direction Register for keyboard lines

– 7 –

SECTION II

SPECIFICATIONS

– 8 –

SPECIFICATIONS

Power Supply

AC/AC adaptor Input 120V/60Hz

Output 8.0V/1.5A 16W

RF Modulator Ch. FC (MHz) Fsc (MHz)

For U.S.A./CANADA 3 61.25 +/-0.25 4.5 +/-0.2

4 67.65 4.5

Output Impedance 75 ohm

RF Output Terminal RCA jack

RF Output Level 1.5 - 2.8 mV at 75 ohm

Central Processing Unit

6803 8-bit processor

clock speed 0.89 MHz

Memory Size

ROM (for BASIC) 8K

RAM 4K (expandable up to

20K-external)

Video Display

Character display 512 (32 x 16) upper case

characters

Semi-Graphic display 64 x 32 elements

Color 8 colors - Green, Yellow,

Blue, Red, Buff, Cyan, Magenta, Orange

Interface

Printer RS232C, 4 pin DIN

Cassette 5-pin DIN 1500 baud

Bus line 34-pin Cartridge connector

Switch Box

Isolation more than 60 dB

Dimensions

8-1/2" x 1-7/8” x 7”

Weight

1.75 Ibs (.7875 kilograms)

– 9 –

SECTION III

DISASSEMBLY / REASSEMBLY

– 10 –

DISASSEMBLY

1. Unplug the units from the AC wall outlet

and disconnect all cables from the rear

panel.

2. Turn the computer over and remove the

four screws from the case bottom. One of

the screws is located under the warranty

seal in the upper right corner of the case

bottom.

3. Turn the computer right side up. Discon-

nect the snap locks located on the right and

left side of the case by placing a slotted

screw driver in the groove between the top

and bottom cases, approximately 2.7

inches from the rear of case. Push in and

turn the screwdriver to pop the case apart.

4. Disconnect Keyboard cable from wire con-

nector. NOTE: Pull flat wire upward.

5. Remove three screws that fasten the PC

Board to the bottom of the case. Remove

the PC Board.

6. Use tweezers to remove eleven clips that

fasten the bottom shield to the P.C. Board.

7. Locate the eight positions where the top

shield is soldered to the PC Board. Remove

this solder with solder wick or a desolder-

ing tool. Bend the protruding edge of the

shield upward until it is parallel to the slot

and remove top shield.

REASSEMBLY

1. Install the top PC Board shield. Solder the

shield to the ground plane at eight points.

2. Install the bottom shield with metal side up.

Secure to the PC Board with eleven clips.

3. Install PC Board in bottom of case. Secure

with three screws.

4. Install the two keyboard cables in their

respective connectors. This will be easier if

both hands are used and you are facing

rear of unit. Refasten cable restraints.

5. Join the top and bottom cases and push

them together at the snap lock positions.

This is a tight fit, therefore repositioning of

the cases may be required.

6. Install four screws in bottom of case.

1. Removal of Top Cabinet

Remove 4 screws as shown in Figure A.

Figure A

2. Removal of P.C. Board

Remove flat wires of keyboard from con-

nector.

Remove 3 screws as shown in Figure B.

Figure B

3. Removal of Keyboard

Remove 4 screws as shown in Figure C.

Figure C

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