JHCon 2011 Basic GOTO-less Compo

News from Factor6 blog.

At JHCon, we usually make some strange compo concerning ZX Spectrum. This year, there will be such a thing, too. Inspired by the famous C64-ish “GOTO Considered Harmful” compo, we announce:
JHCon BASIC GOTO-less Compo!

Rules:

• Your program must write text JHCON 2011 on the screen, while no sign of text “JHCON 2011″ can be visible in the Basic listing!
• The program must do some graphical effect and it must animate.
• Add some funny text to it, whatever you want. This text doesn’t have program limitations.
• The program must be in a loop, by pressing any key except SHIFTs must be finished and end with the 0 OK message.
• To be harder, using of commands GO TO, GO SUB, LOAD and SAVE is forbidden!
• Use of BEEP is possible.
• BORDER effects are possible.
• The program listing must fit into 1 (one) screen. The message scroll? must not be printed. Instead of it, LIST must end with 0 OK, 0:1 message and the program must be visible on 1 screen from its very beginning to its very end.
• Listing must be visible in any occasion, except when PAPER and INK are set to the same colour. So using of direct color commands (EXT.MODE+number or EXT.MODE+SHIFT+number) is allowed, but be careful with them! For example, when PAPER 3 and INK 2 are set, the whole program must be visible and readable.
• The program listing must be an eye-candy (graphically nice, attractive). Modify it by adding REM, spaces, UDG blocks, colours (but take care!). The program is limited to fit to 1 screen, not by amount of bytes.
• Any anti-BREAK and anti-LIST techniques are prohibited.
• The program must not contain any custom machine code in any form (no DATA, no m/c after REM, etc.), nor to run it. Using of ROM routines as well as POKEs are allowed.
• The prog must be saved using SAVE “name” LINE x, where x corresponds to starting line. Any extra additional files (like fonts, UDG, any CODE etc.) are not allowed.
• It must be done in a standard Sinclair BASIC for ZX Spectrum 16/48K, users of 128K machines switch to 48 BASIC mode.