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SUBJECT: ENGINEERING CHANGE NOTICE # 7.

PRODUCT: DOUBLE D DISK CONTROLLER.

REVISION: BAND C REVISION BOARDS.

DATE: OCTOBER 6, 1980.

NOTE: USE NATIONAL SEMICONDUCTOR 74LS123 ONE-SHOTS ON THE

DOUBLE-D CONTROLLER BOARD. THE RESISTOR / CAPACITOR COMBINATIONS

HAVE BEEN SELECTED TO PROVIDE PROPER PULSE PERIODS WHEN USED

WITH THIS ONE-SHOT. DOUBLE D DISK CONTROLLER BOARDS (A&T AND

KIT) ARE NOW SUPPLIED WITH NATIONAL SEMICONDUCTOR 74LS123S.

CUSTOMERS WHO BUILD DOUBLE D BARE BOARDS TAKE NOTE.

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SUBJECT: ENGINEERING CHANGE NOTICE # 8.

PRODUCT: DOUBLE D DISK CONTROLLER.

REVISION: C REVISION BOARDS.

DATE: OCTOBER 6, 1980.

THE FOLLOWING LIST CONTAINS CORRECTIONS TO THE DOUBLE D

REVISION C SCHEMATIC OF 3/7/80. PLEASE MAKE THESE CORRECTIONS TO

YOUR DIAGRAMS.

1. THE OUTPUT OF IC 1M (7406) PIN 6 TO THE PLATE-

THRU HOLE IN THE INTERRUPT BLOCK SHOULE BE

LABELED DINT*. (PAGE 1)

2. A SECTION OF IC 3L (PINS 5 AND 15) HAS BEEN

DRAWN AND LABELED AS A 74LS244. THIS IS SHOWN ON

PAGE 1 CONNECTED TO THE 1791. THIS PART IS A

74LS240.

3. AN INVERTING BUFFER, PART OF IC 3L (74LS240)

PINS AND 9, IS NOT SHOWN IN THE DIAGRAM. PIN 11

IS THE INPUT AND I CONNECTED TO DDEN. PIN 9 IS

THE OUTPUT AND IS THE SOURCE FOR DDEN*.

4. FOUR PIN ASSIGNMENTS OF IC 3H (8131) ARE IN

ERROR. CHANGE PIN 13 TO PIN 11, PIN 12 TO PIN

10, PIN 11 TO PIN 13, AND PIN 10 TO PIN 12.

(PAGE 1)

5. THE INPUT TO IC 4A ON PIN 13 IS LABELED AS

BPWR*. THIS LABEL SHOULD READ AS BPWR. (PAGE 2)

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Qume DataTrak 8 Handbuch Seite 5