[Coco] collecting info for converter
RJRTTY at aol.com
RJRTTY at aol.com
Wed Feb 8 19:50:59 EST 2006
In a message dated 2/8/06 5:28:10 P.M. Eastern Standard Time,
gene.heskett at verizon.net writes:
>Let me jump in here and add that
>the h&V sync signals on this port, will
>if terminated, cause the agnus to
> shut down to protect its output
>drivers. Thats why nearly every cable
> ever made had a chip, sometimes
>even a cmos chip, buried in the hood
> of that db25 connector, whose job
>it was to buffer those 2 or 3 signals.
>I was amazed to find this when I bought
> my first 2000 used off an amiga
>mailing list and found that it came with a
>commie genlock board in it
>because it could drive a monitor.
>An email to Dave Haney confirmed my
>agnus shutdown deduction FWIW. I assume
>the seller had put it in when
>he found he couldn't drive a normal monitor
> (some non commie model I
>suppose) with the regular db25 cable
> attached. So I made one up using
>a TTL chip buffer/invertor and put it into
>mine, and ran w/o the
>genlock card
actually my converter already buffers those lines with
a TTL inverter/buffer chip.
Roy
More information about the Coco
mailing list