[PLUG] hardware help--cga/composite adapter

[John Cirillo]

This is a bit off the wall, but I am trying to recreate a little passive
adapter I used to have. It had a DB-9 plug on one end that fit in a CGA
output port on the computer, and the other end had an RCA jack that could be
connected to a regular TV/monitor input jack.  It produced a monochrome image
but was usable.  I am playing with Lunix on my old Commodore-128 but realized
it is putting out signal on the 80-column (CGA) jack and not the 40-column
composite jack. I do have a CGA monitor but it fell in a recent move and
there are about 50 cracks on the PC board (luckily the CRT is intact!) but it
is a slow process repairing the board. I know that adapter is around here
somewhere, but I can't find it.  I'm guessing there were resistors from the
R,G,B, h-sync, and v-sync pins all tied together somehow, but no idea what
value of resistors to use.  Any ideas?

Thanks.

John
----------------------------------
John Cirillo
E-Mail: cirillo@purdue.edu