Sinclair ZX80 / ZX81 / Z88 Forums

All sorted Greg although shameful embarrassment means I'm not revealing how.

Just an observation.

Saved some BMPs resized via windows paint (successfully) but when it comes to displaying them on the zeddy they are upside down!?

Yes I know the answer is to flip them before saving but was just curious as to why?

Moggy wrote: ↑Wed Dec 20, 2017 9:23 pm they are upside down!?

That has always been the case, I don't know why, see Wilf Rigter's article at

http://www.user.dccnet.com/wrigter/inde ... /BMP2P.htm

Regards;

Greg

GCHarder wrote: ↑Wed Dec 20, 2017 9:34 pm

Moggy wrote: ↑Wed Dec 20, 2017 9:23 pm they are upside down!?

That has always been the case, I don't know why, see Wilf Rigter's article at

http://www.user.dccnet.com/wrigter/inde ... /BMP2P.htm

Regards;

Greg

No, not always, but usually
There is a bit in the header, which indicates, whether it is up or down.

I once wrote a program to convert Zeddy Hires to BMP and set this bit different than usually. Thus I did not need to mirror the HIRES picture, but the PC programs (Firefox or similar) show the BMP correctly even when it is not upside down

Siggi

I have tried your great software on real ZX81 and I can happily report that it works with:

• UDG 4 ZXpand/ZXblast with set jumper to CHR$128
• ZXblast

To get it working on ZXblast:

• REM out line 40 LOAD "BMPS/"+B$+".BMP;32768"
• REM out line 9994 LLIST "M=L"
• When loading press L to load.
• Enter ZXblast loader with Double-Shift-L.
• Select BMP and append ":32768" and N/L to load.
• Press N/L back at the filename prompt.