Sinclair ZX80 / ZX81 / Z88 Forums

Hi Greg, This code run properly, but to speed up the code, Fred Nachbaur use one extra lines to set a variable : 230 LET SZ=ZR*ZR+ZI*ZI 240 IF SZ>4 THEN GOTO 270 SZ is used only one time! 240 IF ZR*ZR+ZI*ZI>4 THEN GOTO 270 Take only one line and speedup the process... EDIT VB81 prints the results n...

Hi Greg,
This code run properly, but to speed up the code, Fred Nachbaur use one extra lines to set a variable :


SZ is used only one time!
Take only one line and speedup the process...

Hi Greg,
I don't know if the BASIC line 310 freeze the program...

Hi Greg,

Who many time to draw this picture? About 3 hours ?


1 hour to reach $7000... and the real clock set to x5 !

Seem to be a STL like card:
http://zx81.ordi5.free.fr/CartesZx81/STL/

A buzzer ?

Hi MOB-i-L, Yes, it's a weird behavior... It loops to the last error or break point. Or... 1 POKE 16384,08 2 POKE 16391,20 10 PRINT "1"; 20 PRINT "2"; 30 PRINT "3"; 40 PRINT "4"; 50 PRINT "5"; 60 PRINT "6"; 70 CONT 10 PRINT "1"; 20 PRINT "2"; 25 POKE 16384,8 30 PRINT "3"; 40 PRINT "4"; 50 PRINT "5";...

Hi MOB-i-L, The CONT can't be used to store machine code, but can be followed by a zero bloc. CONT in a programme is like a REM CONT don't use the NXT_LINE BASIC variable. CONT don't use the ADD_CHAR variable. I tried to use CONT to jump to a line, but i haven't found the good process. It should ret...

Hi, If you had to print a screen in BASIC, you had to wait, and all characters are printed character by character. You can use the FAST command, but you had to display a black screen. In case a D_File swap process, the BASIC is not faster, but the whole screen appear at the same time... 1 REM xxxxxx...

Hi Greg, Thanks for these useful routines. I grabbed one in "Tee-Time"... I changed the size and the colours placed in $4021. 10 REM [HEX:\ 2A,0C,40,23,11,21,00,06,16,36,00,19,10,FB,2A,0C,\ 40,23,23,11,01,00,06,16,D5,E5,D5,3A,21,40,77,11,\ E0,FF,19,C5,06,00,10,FE,C1,D1,1B,D5,7A,B3,20,EB,\ D1,E1,11,2...

Hi, Another early access game from 1986, and now finished... A Golf in French. Name of Software: Tee-Time Author: XavSnap (from Eric LECHAUDEL's broken listing-Hedogiciel summer 1986) Release Date: 06/18/22 Requirements:16k Screenshots: none Description: Golf PenFuller21 early access, finish-it-your...