looks like it is bit 8 of control regester for NTSC



Search for %0000000011001110

Immediately below you will see gosub send, this points the chip to address 14

the next instruction is the actual values that are to be sent
change bit 8 to be a 0

There are 3 places I think that need to be changed

in label FULL0: and MIXED0: and INIT:

FULL0:

IF CURRENTMODE0=1 THEN RETURN

WDATA= %0000000011001110 'CONTROL REGISTER
GOSUB SEND
WDATA= %0001101111010101 ' <<<<< change bit 8 to 0 (far right is bit zero)


FULL0:

IF CURRENTMODE0=1 THEN RETURN


WDATA= %0000000011001110 'CONTROL REGISTER
GOSUB SEND
WDATA= %0001101111010101 ' <<<< change bit 8 to a 0 (far right is bit zero)


In the init routine look for this

WDATA= %0001101111010100 ' change bit 8 to a 0 (far right is bit zero)
'CHANGE BIT 0 TO 1 FOR TEXT ONLY
GOSUB Send ' Control ADDRESS 14


I do not think anything else needs to be done - but I could be wrong.!!

The init routine for the chip under certain circumstances will auto up the address, that is why there is no
WDATA= %0000000011001110 'CONTROL REGISTER
prior to it.

Sorry cannot help much more on the settings.