The Jungle Jim: Character Display, Part II and PAUSE

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See all articles from Timelinez v2 n11

Two-topic column: (1) Machine code details of the TS1000 character generator — the I register must contain 30 (1EH) to point the computer to the correct character table in ROM. Includes a POKE sequence (LD A,n; LD I,A; RET) and BASIC program to change the I register and display scrambled characters, illustrating how the table is referenced. (2) The PAUSE statement: PAUSE values under 32768 count for n/60 seconds; above 32767 count indefinitely; any key terminates. Maximum self-terminating PAUSE (32767) equals 9.1 minutes.

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