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Genrad no longer supports the 1687 and parts are no longer available.
These 99 png sheets were scanned at 600dpi from the original Genrad
1687 manual, and special care was taken to preserve the halftones.
The SXC2316B aka MK28XXX ROMS in this digibridge have been known to
die of old age. This used to be a common pinout.
Here is the pinout of the MK28xxx series. CS depends on part number.
A7 1 24 Vcc
A6 2 23 A8
A5 3 22 A9
A4 4 21 CS3
A3 5 20 CS1
A2 6 19 A10
A1 7 18 CS2
A0 8 17 D7
D0 9 16 D6
D1 10 15 D5
D2 11 14 D4
GND 12 13 D3
The 2716 does not have the needed chip select logic.
+--------------+
A7 |1 +--+ 24| VCC
A6 |2 23| A8
A5 |3 22| A9
A4 |4 21| VPP
A3 |5 20| /OE
A2 |6 19| A10
A1 |7 2716 18| /CE
A0 |8 17| D7
D0 |9 16| D6
D1 |10 15| D5
D2 |11 14| D4
GND |12 13| D3
+--------------+
So it probably makes sense to stuff the data from the 2Kx8
Mask ROMS into an 8kx8 EPROM or EEPROM chip with an active
high chip select pin for use with A15 and upper two address
lines for A11 and A14 as follows:
C28187M -> 1800-1FFF
C28186M -> 1000-17FF
No Data -> 0800-0FFF
C28145M -> 0000-07FF
WRONG: To replace these ROMS with ordinary 2764 EPROM you will need to
WRONG: make a socket adapter with the following pin connection changes:
WRONG: EPROM-Vpp-pin-1 connects to +5V
WRONG: EPROM-PGM-pin-27 connects to +5V
WRONG: EPROM-/CE-pin-20 connects to GND
WRONG: EPROM-/OE-pin-22 connects to ROM-/CE-pin-20
These ROMS can be read on an EPROM programmer as a 2716
if you jumper out the chip-select ping in an adapter socket.
...StepanManual for GR 1687 Megahertz LC Digibridge. Compliments of Stepan Novotill.
1687.pdf (21 MB)
This is the BAMA archive. These manuals are available for download and free of charge.
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