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5C90: MASK-T - Temporary transparent colours
Read by the routines at PO_ATTR and CLASS_07, and updated by the routines at PO_SCR, TEMPS, OUT_FLASH, CLASS_09 and CO_TEMP_1. Holds the attribute mask that is used when printing to the main part of the display. Set bits in the mask preserve the corresponding bits in the original (on-screen) attribute; reset bits in the mask replace the corresponding bits in the original attribute with those in the target attribute (ATTR-T).
Input
Output
MASK_T 5C90 DEFB $00
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