RARE 1976 PROCESSOR TECHNOLOGY VDM1 VIDEO BOARD S100 IMSAI ALTAIR For Sale

RARE 1976 PROCESSOR TECHNOLOGY VDM1 VIDEO BOARD S100 IMSAI ALTAIR


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RARE 1976 PROCESSOR TECHNOLOGY VDM1 VIDEO BOARD S100 IMSAI ALTAIR:
$225.00

RARE1976 PROCESSOR TECHNOLOGY VDM1- S100VIDEOBOARD
This was the first practical teletype like video board for the S-100 bus.A piece of vintage computer history!
Composite video came out via a connector at the top left hand corner of the board. This board has a soldered coax cable with F connector.The VDM-1 generated sixteen 64 character lines from data stored in a 1024 8-bit byte on-card RAM memory. Alphanumeric and control characters (the full 128 upper and lower case plus control ASCII character set) were displayed in a 7 x 9 dot matrix. With its EIA video output, the VDM-1 could be used with any standard video monitor. (A TV set could be easily modified for use with the VDM-1).Two-port memory permitted random read-write access to the screen memory from the memory bus of the CPU. Other features included:Normal (white-on-black background) video display or inverted (black-on-white background) video display, switch-selectable for entire screen or program-controlled for each character.
Video inversion block cursor, switch-selectable blink capability, programmable for each character location.Continuously adjustable display position, both vertical and horizontal.
Text blanking (switch selectable) from CR control character to end of line and from VT control character to end of screen, excluding CR or VT character.
Copy of original manual and schematic asPDF available on request after sale.Board appears to be in clean condition with no corrosion.
The board is compatible with ALTAIR 8800 and IMSAI 8080 as well as other S-100 systems. As-is - Untested - No returns.
From the estate of a long time Ham Radio operator, collector, and vintage electronics repair professional.
Disclaimer:
This is a vintage computer board - it is untested.

This item is not offered as perfect, as it is more than 40 years old, with unknown history. Electrolytic and tantalum capacitors should be replaced before use.

Early microcomputers were known to have faults and require skilled technical knowledge to repair or operate properly.

Static electricity protection in handling is imperative during chip installation or repair.

This item is sold to collectors and technical experts in AS-IS CONDITION - NO RETURNS. Ask any questions before buying.



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