13-02-2022, 07:56 PM
The original colour boards had (essentially) 2 bits per R,G & B with no intensity signal.
There were also 2 versions of the board - the first version required an external circuit to combine the 2 bits per colour into an analogue
output, whereas the 2nd version of the board included that circuitry on the board and the resulting signals fed out other pins of the DB15
connector. Both versions of the board provided COMPOSITE sync out only (ie, Separate Horizontal and Vertical Sync signals were not available
at the output connector.
The colour scheme with these boards was 26 Foreground colours with 8 Background colours.
This differs from when the Premium series came out as it had standard digital RGB + Intensity that was
compatible with the IBM CGA 9 pin connector.
There were also 2 versions of the board - the first version required an external circuit to combine the 2 bits per colour into an analogue
output, whereas the 2nd version of the board included that circuitry on the board and the resulting signals fed out other pins of the DB15
connector. Both versions of the board provided COMPOSITE sync out only (ie, Separate Horizontal and Vertical Sync signals were not available
at the output connector.
The colour scheme with these boards was 26 Foreground colours with 8 Background colours.
This differs from when the Premium series came out as it had standard digital RGB + Intensity that was
compatible with the IBM CGA 9 pin connector.