Purpose: Initialize screen editor and devices
Call address: $FF81 (hex) 65409 (decimal)
Registers: none Memory: system map Flags: none Calls noneResults:
Registers: .A used .X used .Y used Memory: init Editor RAM init Editor I/O Flags: none
Description: CINT is the Editor's initialization routine. Both 40- and 80-column display modes are prepared, editor
indirect vectors installed, programmable key definitions asigned, and the 40/80 key scanned for default display determination.
CINT sets the VIC bank and VIC nybble bank, enables the character ROM, resets SID volume, places both 40- and 80-column screens and clears them.
The only thing it does not do that pertains to the Editor is I/O initialization, which is needed for IRQ's
(keyscan, VIC cursor blink, split screen modes), key lines, screen background colors, etc. (see IOINIT). Because CINT updates Editor indirect
vectors that are used during IRQ processing, you should disable IRQ's prior to callint it. CINT utilizes the status byte INIT_STATUS ($A04) as follows:
$A04 bit 6 = 0 -> Full initialization. (set INIT_STATUS bit 6) 1 -> Partial initialization. (not key matrix pointers) and (not program key definitions)CINT is also an Editor jump table entry ($C00).
SEI JSR $FF81 ;initialize screen editor CLI