Qume DataTrak 8 Handbuch PDF herunterladen (Seite 3)

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SUBJECT: ENGINEERING CHANGE NOTICE # 3.

PRODUCT: DOUBLE D DISK CONTROLLER.

REVISION: BAND C REVISION BOARDS.

DATE: AUGUST 4, 1980.

THE DOUBLE D DISK CONTROLLER USES S-100 SIGNAL SWO*. CPUS

SUCH AS SBC-I00 AND SBC-200 DO NOT GENERATE THESE SIGNALS AND

THEREFORE PRESENT AN INTERFACE PROBLEM. THE FOLLOWING

MODIFICATION HAS SOLVED THE PROBLEM WITH THE ABOVE MENTIONED

BOARDS.

1. ON THE SOLDER SIDE OF THE BOARD: CUT THE FOIL LINK FROM S-100

PIN # 97 TO THE PLATE-THRU-HOLE.

2. ON THE SOLDER SIDE OF THE BOARD: USING A SMALL GAUGE WIRE

JUMPER IC 1H PIN #2 TO IC 3J PIN #1.

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SUBJECT: ENGINEERING CHANGE NOTICE # 4.

PRODUCT: DOUBLE D DISK CONTROLLER.

REVISION: BAND C REVISION BOARDS.

DATE: AUGUST 4, 1980.

THE DOUBLE D DISK CONTROLLER EXHIBITS ERRATIC OPERATION WHEN

RUN WITH. THE BIG-Z Z80 CPU BOARD. THE PROBLEM EXISTS ON THE

BIG-Z BOARD. THE FOLLOWING MODIFICATION FIXES THIS PROBLEM.

NOTE: THE BIG-Z DOES NOT SEND OUT WRITE DATA TO THE S-100 BUS

UNTIL IT ACTUALLY SENDS THE WRITE STROBE. THIS MODIFICATION

ALLOWS THE WRITE DATA TO SETTLE ON THE S-100 BUS BEFORE THE

WRITE STROBE IS ISSUED.

1. ON THE SOLDER SIDE BIG-Z: CUT THE FOIL FROM IC 22 PIN # 13.

2. ON THE SOLDER SIDE BIG-Z: JUMP IC22 PIN # 13 TO PIN # 3.

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Qume DataTrak 8 Handbuch Seite 3