On Jul 12, 2015, at 11:21 PM, Marco Rauhut <marco at familie-rauhut.eu> wrote: Hello; I have here my first Sinclair ZX81 Computer with 16K Ram extension. To check if the Ram extension works properly i want to write an small Basic program to check each byte. The first thing i struggle on is that 1 could not type in a for next statement. 10 FOR I = 17000 TO 32768 if I type in this line, the ZX81 mark an inverted "S" just before "TO". 10 FOR I = 17000 "S"TO 32768 I found out that the ZX81 "think" that there is an Sytax Error with the TO. So i tryed all combinations with and without spaces in that basic line.... Nothing matters. Is there someone who knows about that behaviour? Marco * Englisch - erkannt * Englisch * Deutsch * Englisch * Deutsch <javascript:void(0);><#> --- Filter service subscribers can train this email as spam or not-spam here: http://my.email-as.net/spamham/cgi-bin/learn.pl?messageid=655CAAF2292711E5B…