8K Memory PEEK

A simple memory viewer for a 16K ZX81. Enter a starting address (an even hundred is easiest; 0 shows the start of the ROM). After about 15 seconds the screen shows the 100 bytes from that address in five columns, with the addresses down the left. The program stops after each screen; CONT shows the next 100 bytes.

The author offered the program on cassette. It runs faster in FAST mode.

Published in Syntax February 1982 (8K Memory PEEK).

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8K Memory PEEK

This slow but simple program peeks memory 100 bytes at a time. It displays consecutive bytes in 5 columns by 20 rows. Designed for the ZX81, it works with 16K RAM.

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Source Code

  10 PRINT "ADDRESS IS =",
  20 INPUT A
  30 CLS
  35 PRINT AT 0,6;"WAIT 15 SECONDS"
  37 PAUSE 80
  38 POKE 16437,255
  40 PRINT AT 0,6;"+00 +20 +40 +60 +80"
  50 FOR I=1 TO 20
  60 PRINT AT I+1,0;A-1+I
  70 NEXT I
  90 FOR J=1 TO 5
  95 FOR I=1 TO 20
 100 PRINT AT I+1,6+4*(J-1);PEEK (A-1+I)
 110 NEXT I
 120 LET A=A+20
 130 NEXT J
 140 STOP
 150 GOTO 40

Note: Type-in program listings on this website use ZMAKEBAS notation for graphics characters.