Solid State Music - VB1B
This was a very reliable and popular
video display card in the early days of the S-100 bus. Many early memory mapped
video games were run from either this card or the Processor Technology
The board displayed 64 (or 32)
characters per line with 16 lines per display. It could be set to graphic
mode where 128X48 pixels could be displayed. The character generator was
the Motorola MCM6571A. The four pins on the top left hand corner put
out H & V Sync signals along with the video itself and a ground line.
There was also a connection for composite video. Memory was eight 2102L's.
The RAM could reside at any 1K boundary within the 64K address space.
There was no phantom line but if you
removed U41 and bent up pins 11 and 13 of U28 you could overlap the memory with
any other RAM card you had in your system. These were the output drivers on to
The excellent manual for this board can
be seen here
Other Solid State Music
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