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Additional info for Compute!'s second book of Atari
We ca n see n ow why the 2 and 3 bits of ICAX I a re ca lled "direction bi ts " - th ey con tro l the direction of da ta fl ow. H owever, this is n ot all that th e bits of ICAX 1 ca n do. Certa in I/O dev ices can be made to do spec ial things by sett ing so me of the oth e r bits. The Screen Editor is on e of these ce rta in devices. It supports a mode of operation th at Atari ca lls the force read mode. It wo uld see m to me that " forced e nte r mode" is a mo re descr ipti ve n ame, but I suppose that this sounds too muc h like "forced entry" and h en ce, a bit too fe lo nious.
400-420 Gets keyboard entry. 450-560 Draw-to routine. 600-670 Fill routine. 700-730 Stops. 750-870 Adds or deletes lines. 900-980 Menu. 1000-1210 Views in PIM graphics. 1220 POKEs X position and size. 1230 Stops PIM View. 1240 POKEs Color. 1250-1280 Changes size. 1300-1390 Changes color. 1400-1450 Edits. 1450-1480 LISTs player data. 1500-1610 Programs writing program for tape.
Whenever a n INPUT command is iss ued ove r a ch anne l (I0CB ) that h as been se t up for forced read, the Ope rating System does n o t wait for the operator to push the RETURN key, but immediate ly INPUTs the data from the logical line in which the c ursor is res iding. A ll data that is under or to the right of the cursor may be IN PUT at this time. N o te carefully this last remark. This mode does n ot work precisely like the more usual one in 27 Chapter Two. Programming Techniques which data to the left of the c ursor may be INPUT.