Sinclair ZX80 / ZX81 Forums

[MOB-i-L]

I have scanned an old folder with documentation, articles, and tips for ZX81: http://www.df.lth.se/~mikaelb/sinclair/zx81/, see mob-i-l_zx81.pdf. I might improve the scanning of some pages in the future. There is also a Swedish version of the sales folder.

It contains useful material written in English, Swedish and Danish. Some has never before been published and is written by me (between 1981 and 1986 when I was below 20 years old).

1. Negative ZX81
2. Manual for 56K RAM-pack
3. Manual for sound-card with AY-3-8910
4. Documentation for DIN-connectors
5. Frequencies of musical notes
6. Articles from Practical Electronics
7. Speech Synthesiser with veroboard layout
8. CMOS RAM to replace ROM with veroboard layout (Probably unique -- Warning: It doesn't work unless you also make changes on the ZX81-circuit board.)
9. Temperatur-Analog Interface (Never built by me.)
10. ZX Printer from Sinclair (I never owned one.)
11. Sea Mines (High-resolution graphics without extra hardware! How did it work?)
12. Number-hunt (Never tested by me.)
13. Software-exchange (I improved the 3D-labyrinth-software.)
14. Computational-tricks for BASIC
15. Memory-map for ZX81.

It is OK by me to extract the individual articles and other material and distribute them separately.

All equipment and all building projects worked and still works:
http://www.df.lth.se/~mikaelb/edu/ellar ... -tillb.jpg
http://www.df.lth.se/~mikaelb/edu/ellaraa/zx81-lod.jpg
http://www.df.lth.se/~mikaelb/edu/ellaraa/zx81-komp.jpg

The computer was built by me in december 1981. Most of the equipment was built in 1985-1986 when I was doing military service in the air force as electromechanic for the fighter-plane J35 Draken (ever noticed the two Draken planes on the ZX81 BASIC Programming book?). In the fall of 1986 I started to study maths, physics and computer science at Lund University. There I used mainframes running VMS and IBM PC. In january 1988 I bought my second PC: Amstrad PC1512 (the ZX81 is also a PC, see the bottom of a ZX81).

[sirmorris]

THANKS!

[gus]

Thanks !!!

it's good to have some "new" material to read
I will find the sea mines on the web and if I can't found it I will type it so we can see it on action...

The pictures are fine, but in my opinion this equipment deserves a better image gallery

Thanks again,
Gus