Radio Shack EC-293 Technical Information download pdf (Page 31)

Bus Card-Edge Signals

This card edge duplicates the card edge

the TRS-80 Computer.

SIGNAL

NAME

RAS*

SYSRES*

A10

A12

A13

A15

GND

All

A14

OUT*

WR*

INTAK*

RD*

IN*

INT*

TEST*

GND

WAIT*

GND

+5V

DESCRIPTION

Row Address Strobe

Output

for

16-Pin Dynamic Rams.

System

Reset

Output,

Low

During Power Up Initialize

Reset Depressed.

Connection

Address

Output

Address

Output

Address

Output

Address

Output

Signal Ground

Address

Output

Address

Output

Address

Output

Peripheral Write Strobe

Output.

Memory Write Strobe

Output.

Interrupt

Acknowledge

Output.

Memory

Read

Strobe

Output.

Connection

Address

Output

Bidirectional Data Bus.

Peripheral

Read

Strobe

Output.

Bidirectional Data

Bus.

Interrupt

Input

(Maskable).

Bidirectional Data Bus.

A Logic

"0"

TEST*

Input

Tri-States

- A 15,

- D

WR*,

RD*,

IN*,

OUT*,

RAS*,

CAS*,

MUX*.

Bidirectional Data Bus.

Address

Output

Bidirectional Data Bus.

Address

Output

Bidirectional Data Bus.

Signal Ground

Bidirectional Data Bus.

Address

Bus

Bidirectional Data Bus.

Processor Wait

Input,

Allow

for

Slow Memory.

Address

Output

Address

Output

Address

Output

Signal Ground

Address

Output

5-Volt

Output

(Limited

Current)

Address

Output

NOTE: *

means

Negative (Logical

"0")

True

Input

Output.

1 3 5 7 9

13 15 17 19

25 27 29

35 37 39

'222

2 2 2 2

;:;

::;

;:;

::;

z z z

::;

;:;

2 4 6 8 10 12 14

18 20 22

24 26

28 30

32 34

36 38 40

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 41 42

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Radio Shack EC-293 Technical Information Page 31

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