Simulating GOTO from machine code — ZXNet «code.zx»

From Southern Bear To All 16 September 2006

Hello, Jukov ld HL,#0014 ld (#5C42),HL ld A,1 ld (#5C44),A

From Southern Bear To All 16 September 2006

Hello, Jukov ld HL,#0014 ld (NEW_PPC),HL ld A,1 ld (NS_PPS),A

From Southern Bear To All 16 September 2006

Hello, Darkman007 kind of pretending

From Southern Bear To All 16 September 2006

Hello, Jukov Nobody guessed. Do you really think that I wrote here without checking? File: next_ln0.PNG http://zx.pk.ru/attachment.php?attachmentid=3783 File: next_ln1.PNG http://zx.pk.ru/attachment.php?attachmentid=3784

From Vladimir Tugai To All 16 September 2006

Hello Southern Bear What, do you think they are so smart? :biggrin:

From Konstantin Zhukov To All 16 September 2006

Hello Southern Bear }{a-ha-ha. Well, you guessed wrong. In fact, you only need to change one variable - CHADD 23645 (this points to the next character to be interpreted). It is necessary so that it points to the carriage return character on line 20. Then everything will be tip-top.

From Konstantin Zhukov To All 16 September 2006

Hello Southern Bear Thank you. Found an error. The problem was that I had to write a universal procedure - so that when calling it from any line, the transition will be to next line. My first option was: ld hl,(#5c42) inc hl ld (#5c42),hl xor a ld (#5c44),a ret But as it turned out now, the variable 5C42 did not contain the line number with RANDOMIZE, and the line number from which the program was launched. Therefore several times the second line of the program was executed. Correct: ld hl,(#5c45) inc hl ld (#5c42),hl ld a,1 ld (#5c44),a ret

From Georgy Rossinsky To All 1 October 2006

Hello, Jukov Juk> Let's say we have two lines: Juk> 1 PRINT "AAAA" Juk> 5 PRINT "BBBB" Juk> 10 RANDOMIZE USR 30000; PRINT; "A" Juk> 20 PRINT "B" Juk> Juk> At address 30000 you need to place a procedure that would transmit Juk> control immediately to line 20. I tried increasing it by one Juk> system variable NEW PPC, and PPC to zero. But for some reason Juk> line 5 was executed several times, although there was no hint of a loop even Juk> no. I tried it through 1B7D, as described in ZX/Review 94/2, but the same Juk> glitch. Look at any of my loaders. http://zxaaa.untergrund.net/RIP.html There, the defense is rich on the topic of transition in BASIC between lines, operators and RETURN. For example, performing BASIC after REM Everything is achieved by substituting system variables and addresses on the RETURN stack.