I have "rescued" wonderful 2x20 dot matrix character VF display from
being thrown away.
It was made 10.07.1995 according to the stamp.
It includes not only the display itsself but a pcb with controller and
different logic chips on it.
Printing on the PCB:
DISPLAY SYSTEMS M202-MD-07G-2 (the number looks like those used by
There is quarz oscillator with 11.0592 (MHz/KHz???)
There are for jumper connectors, with printing:
TEST,RxD1,RxD2,RXD3,RxD4. The last one is jumpered, all others are open.
There are two (!) connectores with 16 pins each. Two pins at one of the
are marked GND and VCC.
There is a little coil or trafo -- may be for generating the higher
voltage for the
VFD -- soldered on the PCB.
The VFD itsself consists of 2 rows of characters (5x7 dots each). The
lower row has
also a triangle under each character, pointing down.
On the back of the PCB there a seven chips marked SN75512B made by Texas
There is also one chip marked SG3524 (Texas Instruments) and one chip
(C) INTEL 80, 82
It has eleven pins at each of its sides (44 pins in sum).
This one seems to be the "processor" or "controller"...
I have googled a lot but only foudn either data sheets of bare VFDs
or descriptions of VFDs with controller, which seems totally different
I would be very lucky if it would be poosible to revive this beauty ! :)
mcc here any informations about this display, datasheets, links or
which could help me to reactivate the display?
Thank you very much in advance for any help!
Best regards and have a nice weekend