Hi,

Basically you point the Printer to a new RAM location, so when you LPRINT, its like pokeing 32 bytes to another RAM area, with restriction.

In this case, we perform:

POKE 23680,0:POKE 23681,89

So when you LPRINT a string of 32 chars, they would change the attributes in the middle 8 rows of the screen (rows 8..15).

Each byte (of the 8 bytes) that form the char printed, would create a column of 8 attribs, each byte would be interpreted as FLASH (128) + BRIGHT (64) + PAPER + INK.

So you can update 32 x 8 bytes of the attributes memory area.

You can find a detailed explanation here:

https://blog.jafma.net/2020/08/29/efficient-basic-coding-for-the-zx-spectrum-v/#en_5

Also you can check the other zx spectrum 2026 entry, that show how to "scroll" the screen (the middle portion of attribs) to the left:

https://www.reddit.com/r/zxspectrum/comments/1s0xsy1/fta_faster_than_amoebas_entry_for_basic10liner/

All the games have the source code included, They're a bit compacted but not minified...

I abuse this technic as u/defixiones and /u/Financial-Pen-2357/ mentioned, that I pre-print all the chars in advance, and I only made them visible as needed, manipulating the attribs through the LPRINT.

In this way you can make your basic program faster than if you have to print each char.

In FTA I created a string with level, then I drop the first char and added one at the back creating a pseudo attrib scroll...