Sinclair ZX80 / ZX81 Forums

I've fixed a nasty bug in the port of Mazogs for the ZX80 that would randomly cause the game to crash. I've produced a fix for this and uploaded the new version of the game to my website. It can be downloaded using the link provided in this thread's original posting.

EightyOne 1.9 is now available from: https://sourceforge.net/projects/eightyone-sinclair-emulator/ The headline features are: - Enhancements/bug fixes to the breakpoint facility. - Bug fixes to the Wav Loader window. - Support for recursive Step Over debugging. - Support for Chroma 80 ROM cartridges...

In OPTIONS there is "TV emulation" which can be ticked or unticked but it does zilch except show the tick, no "BOX" brought up. Only just seen this posting. Does the problem still exist? It might be that the dialog is being displayed but is just appearing off screen. If so then with TV Emulation ti...

It's no big issue, but do you know why in the EightyOne emulator the PC's cursor keys worked with the previous version, but not with this one? Here both keys move the base to the left. It's no big problem as this seems to affect only the emulator. The patch checked for the standard game keys (SHIFT...

It sounds like you've put a lot of thought into the colours used and so I say run with it as you intend.

Attached is a new patched version of the game that supports both the standard control keys and the cursor control keys.

Nice work! :D I agree with you that the first version looks better. Have you tried making the blue and green characters forming the aliens the same colour, which would give their colouring full symmetry? As requested, attached is a patched version of the game that uses the cursor keys. spaceraiders(...

for eee=0 to 767 seed=smsrnd(seed) dfile=peek uinteger(16396) poke dfile+$8000+eee,seed next The above code does not take into account the 'NEWLINE' positions within the attributes file. The attributes file begins with a position corresponding to the initial NEWLINE character in the display file, f...

Here’s some example assembler code to show the basic mechanisms for accessing the two colour modes provided by the Chroma 81 interface. CHECK AVAILABILITY Reading I/O port $7FEF can be used to check whether the Chroma colour facility is enabled: LD BC,$7FEF IN A,(C) AND $20 The A register will hold ...

A description of the colour modes can be found at the end of the document available from here.

On SourceForge I collated all the versions of EightyOne (and their source) I had collected over the years and also those I could find scattered across the Internet. Although I doubted anyone would ever have a use for these very old versions, it seems a shame to lose them. However, the set is far fro...