Available on Commodore Amiga CD32.
** <-Kickstart-ROM | ** AKIKO-chip | ** / | __ | | | :<*TP9* | |__| : | : | --- ---- |______| |_____| ^ ^^^^^ ^ 1 Exp.port 182
-_- |o| 1 |o| |o| |o| |o| |o| |o| |o| |o| |o| 10 ---
|Pin||Signal||Equivalent at Expansion port.|
|6||RED||163 & 164|
|7||GREEN||165 & 166|
|8||BLUE||167 & 168|
|10||GND||161 & 162|
The RGB-signals come from the D/A-conversion-unit and lead directly to the expansion-port. These signals are, however, *not* amplified. In addition they are weakened by the (s-)video output-unit. As a result I (aim to) insert a 47 Ohm-resistor to each colour-signal connection. You may also reduce the load by interrupting the signal- supply to the (s-) video unit. Set pin 174 of the expansion port to GND to achieve that. (174-->u36 (4066) signal-switches)
The SYNC-signals connected to the exp.port are unbuffered. As a result you may re-synchronize your amiga by an external tact source. You should at least buffer the CSYNC-line; there is no external synchronisation possible on this pin.
Hint: make use of an XOR-Gate chip. You may negate certain SYNC-line(s) to adapt your amiga to (old? :-( multiscan-monitors. (the A4000 monitor adapter box will do the same; w/o the possibility of selected negation)
- Usenet posting CD32 expansion port info at comp.sys.amiga.hardware by Anders Stenkvist