Heathkit ETW 3400 Manual

Page 2

Page 2

PART I

IMPORTANT NOTICE

After you install this Modification in your Microprocessor Trainer. the clock
frequency for the Microprocessor will be changed This change in clock fre-
quency will improve the performance of the Trainer and allow you to use it
successfully with the ETA-3400 0 Memory Accessory. However. the change in
microprocessor clock frequency will alsomodify some of the experiments in the
EE-3401 Microprocessor course. These experiments were designed to be used
with the standard trainer RC clock. We recommend that you complete these
experiments prior to installing this Modification Kit

PARTS LIST
KEY HEATH QTY. DESCRIPTION CIRCUIT
No. Part No. Comp. No.
A1 6402-12 1 1000 I! (brown-blaett-red) R49
resistor

54 21-51 1 20 pF ceramic capacitor C23
CI 56-89 I 60510 diode

344-59 15' White wire

347~55 8' 8-wiru (tat cable
H14 404-536 1 4 MHz crystal Y|
53 432-1062 1 40-pin dual connector

84640 i' Siewing

Instruction sheet

Heathkit'

597-1954-02

Page 21

Heathkit

Page 21

NOIE: USE THE IC FULLER WHICH WAS
FURNISHED WITH YOUR ELJOD K114

\

PUSH IHE SHORlEIl END or If. FULLER
IN BEIWEEN HIE IC AND THE SOCKE'I
AND ROCK IHE LONGER PORNO" BACK
AND FORIH. BE VERY CAREFUL, AS THE
IC PINS ARE VERY EASILY BENl.

Refer to Detail 245A and removethe K: from its socket.
Then hold the 1C in your hand.

lfyou haven piece of conductive l'oam (from previous
MOS lC's) you can press the IC into its foam for stor-
age. If you do not have a piece of conductive foam.
install the IC in the large connector block at the bot-
tom front of the Trainer.

( ] Carefully remove and set aside integrated cir-
cuits U14 and U15.

[ ) Refer to Detail 2-68 and, taking care to observe
the pin 1 end ofeach 1C and making sure all the
pins are straight. install the lC's into the
E'I'A/EWA-3400 Memory Accessory at U115
and U116.

mu um m mat "'i'u 9)
Wfiih W

AS YOU INSIALL EACH IC IN lHE
FOLLOWING SlEPS. BE SURE THE
LEADS ARE SIRAIGHT. THEN POS-
lllON lHE PIN 1 END of 1H! IC

A1 If END OF THE SOCKET WHERE
lHE INDEX MARK IS SCREENED 0N
DIE CIRCUIT BOARD. INSER'I THE
lC LEADS INTO YHE SOCKET AND
PUSH IHE It OOIVN INTO PLACE. BE
SURE YOU DO NOT BEND OVER AMY
IC LEADS, THIS IS VERY EASY TO DO.

PEILW
/l.

INDEX
MARK

Detail 2-63

I ) Using sandpaper, clean all paint from the top
inner flange of the ETA/EWA Memory Acces-
sory.

( ) Secure the cover back onto the Memory Acces~
sory on the back panel only with the screws you
previously removed.

[ ] Place the Trainer onto the top of the Memory
Accessory Cabinet. Roll the RF (toil) shield
down and to the rear. and position the bare toil
edge of the shield between the Accessory
cabinet top and the front panel top flange. Se-
cure the front panel ot the Memory Accessory
with the screws you previously removed.

This completes the "Microprocessor Trainer Modifi-
cations."