INLOAN
Investment/loan analysis. Computes either amount, payment, interest rate or time given any of the other three elements. 16K.
Timex/Sinclair 1000
IRR/NPV
Internal rate of return/net present value analysis. Computes IRR, NPV or both for an investment given a series of annual cash flows. 16K.
Mountain Raider
Your mission is to patrol the mountainous regions of Phelld for the demonic craft of the Cyborg. Do not waste your firepower but, if the demon hits you, you walk home. 16K.
Partial Pascal
Subset of Pascal for the ZX81/TS 1000. Includes if, then, else, case, of, otherwise, while, do, repeat, until, for, to, downto, begin and end for program control; read, readln, write, writeln, reset, rewrite, eoln, eof, inkey and text for input and output; +, *, div, mod, abs, chr, odd, ord, pred, succ and sqr for
Personalized Flexible Data Base
Data base management system featuring variable length fields, indexing, multiple key searches. 16K-64K.
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PROM Burner Development System
Interface board for programming EPROMs. Includes two I/O ports, access to 8K of executable memory and tools for duplicating, revising and verifying EPROMs. In 1984, it was marketed as a solid state “Disk Drive.”
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RENLEN
Renumber/length utility. Automatically renumber program in any increment plus list new line numbers containing GOTO and GOSUB with necessary edits. Also shows amount of RAM required. 16K.
RPNZL
Reverse Polish Notation ZX81 Language is a FORTH-like language. Faster than Sinclair BASIC, support for structured code and faster tape load/save. 16K.
Schedule
Enter appointments and short memos in any order. Retrieve them by day, week, month or year. Holds at least 75 items; up to 250. RPNZL application. 16K.
Special Situation Selections Program
Predicts winners of NFL games 75% of the time. Second program predicts game score. 64K.
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