Sinclair ZX80 / ZX81 Forums

olofsen wrote: ↑

Sat Sep 21, 2019 9:19 am

LET LIKES=LIKES+1

Now there’s no excuse for not using your great emulator Olofsen.

Some storage devices like ZXpand can load a binary file to any location in memory. This is convenient when you want to load above RAMTOP, or load a machine code program to memory between 8k - 16k. With help from the online emulator JSZeddy , you can create .P files that load to any location in memor...

I think the length is used to quickly find the next line when finding a line number for GOTO or GOSUB.

Or as you found out yourself: Find the line to edit it. So anytime you have a line number, the ROM uses the length of the line to quickly skip down to the line searched for.

Sorry I don’t see the point of yet another replica.

There’s already Grant Searle’s version, and ZX96, ZX97, ZX2000.

If I would build my custom ZX81 it will probably be ZXNU from ZXTeam. It also uses standard components and has build-in flash drive.

Hi Dr Beep

I’m very impressed with your game 1 Karat Bejeweled clone in 1k with hires graphics.

That’s a great challenge. Not too easy not too hard.

This game does not only need a ZX81 but the ZXpand expansion as well. Maybe your emulator version does not support that

I’ve just bought the book used on Amazon for under €9 incl. shipping. We’ll see when it arrives.

It’s moved to http://www.zx-modules.de/

Reading zxdocs I see what you say. Basic Vars can be above $C000, but Basic code cannot because the D-file has to be below. 48K RAM RAM is located at 4000h-FFFFh, same restrictions as for 32K RAM apply. The memory at C000h-FFFFh can be used as data storage only, but not for machine code execution, a...

I think we misunderstand each other.

I asked: Why not set the RAMTOP to FFFF?

Because this memory will be fine for all except executing ML.

I assume Basic lines can be there, and I assume Basic Vars can be there. Only problem will be if D-File is on top of the $8000 address.