My building of Galaksija computer (thanks a lot Vlado Vince!)
-
Case (link)
- It contains scad files for the enclosure and the keys. (base) (top) (keys)
- The enclosure can be printed in 4 parts in order to fit in normal printers (aka Ender3)
- Keys include also an stabilizer for space bar, you can print keys with letters on it or whithout it ans use stickers (link). Of course the script to generate it is available (link)
-
HW (link)
- In order to build it follow instructions from https://github.com/mejs/galaksija
- I have used v2 pcb which supports cherry switches (https://cdn.hackaday.io/files/6059259228256/Galaksija%20Outputs.zip) and you can get switches (70 pcs) from here (https://aliexpress.com/item/1005006396423418.html)
- I use a Z80 that supports 20Mhz (not needed of course) Z84C0020PEC
- I have used 27C512 for the ROMs instead of 2732 in a Manhattan style.
- You just need add some wires like in the diagram and replicate the rom file.
- Plan b: Get an adapter such as https://www.ukvac.com/forum/threads/2708-2716-2732-adapter-to-27512-eeprom.67258/
- You just need add some wires like in the diagram and replicate the rom file.
- Get authentic ICs or you will have problems and a lot of "fun".
- I have wired BRK, NMI and Reset and connected to buttons on the back side.
- Audio connections go to KI and KM
- C2 is 1 uF (105)
- Capacitor next to Z80 is 3.3 nF (332)
-
ROMS (link)
- Assembly files for ROM A, B and C !!!!!
- I am using ROM A (v29 B autostart)
- You can check it from your Galaksija with
DUMP &0037,1 1D (for version 29) DUMP &03F9,1 CD 00 10 (call $1000 for version 29)
- You can check it from your Galaksija with
- For ROM B, I use normal (ROM_B)
- Check yours with
DUMP &1024,1 0C (for ROM B normal)
- Check yours with
-
SW (TO-DO)
- Document GTP format (WIP)
- To load SW I got best results with a laptop. Mobile phone seem to have lower signal voltage and did not work.
-
Other links
- https://qsl.net/yt2fsg/galaksija/galaksija_clone.html
- https://www.специалист-пк.рф/Galaksija/index6.html
- https://8bitchip.info/galaksija/galaksija/schemes/GalaksijaPlus.pdf
- https://emulator.galaksija.org/MagScans/index.html
- https://github.com/YagoTudela/Galaksija_Plus/blob/main/SoundGenerator/SoundGeneratorPVV_01.png