Questions about the 8563 / 8568

Hallo allemaal,


I was looking at the schematics of the C128 to see how Commodore created the composite signal out of the standard RGB ones.  And it raised some questions:

- It is not mentioned or missing on Bo's site, http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/csg.chips.info , but does the 8563 and 8568 have different pin-outs?

- I only noticed now, and that after 30 years, that I don't see any character ROMs that provide the 8563 and 8568 with data. Do they have build-in ROMs or am I missing something?

- The 8568 has a composite video and sync pin. Does this mean that the DCR outputs a color composite signal?

- AFAIK the IBM CGA card outputs a color composite signal. Has nobody ever tried to hack the C128 to create one as well?

- Has anyone used the 8563 or 8568 in another (self built) computer? I was thinking about using a 6847 because it doesn't use memory in the CPU range and seeing that the 8563 and 8568 having this feature as well, I'm thinking using one of them.

Thank YOU VERY MUCH IN ADVANCE!


Met vriendelijke groet,

Ing. Ruud Baltissen
Senior Beheerder TI

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