ZX-TOOLKIT instructions in brief http://www.zx81.de First load TOOLKIT or TOOLK64. Both use about 2300 bytes of memory. TOOLKIT needs a ZX81 with 16K-RAM and will be copied under RAMTOP and then RAMTOP will be lowered. TOOLK64 will be copied in the region 14 - 16K. You must have RAM there. Both programms will run under ZX81 emulator XTender on a DOS-PC. Then load your ZX81 programm you want to work with. Call the functions with RAND USR address or RAND USR variable variable address for 16K / 64K version 30506 / 14122 will define the names of the following variables RENUM 30524 / 14140 will renumber the whole BASIC-Program you are asked to enter START line and STEP, even GOSUB and GOTO line-number will be changed DEL 31155 / 14771 deletes from START to END line number MEM 31850 / 15466 shows the memory available DUMP 31532 / 15148 lists the names of all defined variables and strings (no arrays) FIND 31233 / 14849 finds strings, to find keywords use THEN keyword, then delete THEN REPLACE 31751 / 15367 like FIND, but cannot replace numbers REMKILL 31062 / 14678 deletes all REM-lines SAVE 31273 / 14889 saves the BASIC program below RAMTOP (high line-numbers!!!) then LOAD the second BASIC-program (low line-numbers) APPEND 31385 / 15001 copies the first loaded BASIC-programm just behind the second one