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SUBJECT: ENGINEERING CHANGE NOTICE # 5B.
PRODUCT: DOUBLE.D DISK CONTROLLER.
REVISION: BAND C REVISION BOARDS.
DATE: AUGUST 5. 1980.
IMPORTANT NOTICE! BOARD MODIFICATION NEEDED ON REVISION C.
THIS ECN PERTAINS TO THE USE OF THE DOUBLE D DISK CONTROLLER
WITH JADE RELEASE # 2 OF CP/M 2.2. CONNECTOR J3 PIN #48 WAS
DESIGNATED ILLEGAL PACK*. IT HAS BEEN REDEFINED AND IT IS NOW
DESIGNATED TWO SIDED*.
MANY SHUGART SA800/801. SIEMENS FD100-8. AND OTHER MODELS OF
DISK DRIVES HAVE OPTIONAL DATA SEPERATORS INSTALLED. DISK DRIVES
USING THESE OPTIONS USE PIN #48 OF THE 50 LINE RIBBON FOR THE
SEPERATED DATA* SIGNAL. AS RELEASE #2 (SPECIFICALLY DCM2)
MONITORS THIS SIGNAL LINE FOR TWO SIDED*
. ERRATIC DISK OPERATION
WOULD BE EXPECTED. PLEASE CUT THE FOIL LINK BETWEEN THE TWO
PLATE-THRU-HOLES AT J3 PIN #48 (REVISION C). FOR USE WITH THE
SA850/851 DISK DRIVE A JUMPER SHOULD BE INSTALLED .ON THE J3
PATCHING AREA FROM THE LOWER PIN # 48 PLATE-THRU-HOLE TO THE
UPPER PIN #10 PLATE-THRU-HOLE. THIS COMPLETES THE PATH FOR THE
TWO SIDED* SIGNAL FROM THE SA850/851.
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SUBJECT: ENGINEERING CHANGE NOTICE # 6.
PRODUCT: DOUBLE D DISK CONTROLLER.
REVISION: BAND C REVISION BOARDS.
DATE: AUGUST 5, 1980.
NOTE: CONCERNING THE DOUBLE D DISK CONTROLLER WHEN USED WITH
64K OF SYSTEM MEMORY OR ANY OTHER MEMORY ARRANGEMENT WHERE THE
DOUBLE .D MEMORY WINDOW OVERLAPS ASSIGNED MEMORY SPACE.
WHEN USED IN THIS CONFIGURATION THE PHANTOM BLOCK MUST BE
JUMPERED TO COMPLETE THE PHAN* SIGNAL PATH TO THE S100 BUS. THE
PHANTOM BLOCK IS LOCATED BELOW IC 4D. IT APPEARS AS TWO PLATE-
THRU-HOLES ENCLOSED BY A SILKSCREEN BORDER LABELED PHAN*. ADD A
JUMPER CONNECTING THESE TWO HOLES TOGETHER. ANY MEMORY BOARD
THAT THE DOUBLE D IS TO OVERLAP MUST BE CONFIGURED SO AS TO BE
DISABLED WHEN RESPONDING TO THE PHANTOM SIGNAL (PHAN*).
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