6809 OS-9 Level-I machine

posted a pdf snapshot of current schem. in "files"

familial health issues require a lot of time, working on getting the situation improved. builduing and set up of a "granny annexe" for my dad is almost done, professional home care underway. will need some time to tackle own health issues afterwards, health resort stay scheduled as of mid april.

made friends with OS-9 and emulators meanwhile!

Nope. I tried. Nope. I DO understand, convertible file format, open source and so on. But. I didn't like it. Went back to EasyEDA. And learned using ports! :-\ Now, seriously, did I mention I was a (bloody) rooky in schematics drawing? Oh, you've noticed already...

;-)

I got the schematics cleaned-up and improved, so they're slowly looking like... schematics. :-) Split up now in several boards, resp. planes, but that's not yet a final design. I mean the layout of the pcb. Still not decided whether to go for an ATX-board or for a proprietary small bus system with multiple boards. At the moment the design shows different boards resp. planes.

I will sooner or later make the schematics publicly accessible, but don't feel like, yet. Here's another preview:

alright, OK, I got it

improving and redrawing everything in KiCAD

CPU, ROM and serial are final, too, will try to PROPERLY split the layout

I got fed uo of drawing and dug a bit deeper into OS-9 (by books so far)...
Folks, has anybody ever dug OS-9? If so, how comes it just... where was it? Why didn't I ever use any OS-9 computer? It is so brilliant, my mind is totally blown. I didn't know. Why didn't I know, the heck! I'm in love. :-)

What an adventure this 6809 has become! Little did I know. I should have stuck to the 68K, it's so much easier, linear address space is such a relief. :-) 

Boring almost... :-) my side (research, have good books at hand) project is of course still a 68K machine, a simple but reasonable computer is really lesser challenging due to things like linear SRAM. And if one likes it more sophisticated, an ATARI ST or AMIGA is only the beginning...  (Looking forward to sooner or later tackling the 030, maybe finally skipping the 68K)

Okay... still a bit... ugly, but better, still.

6883 with chip selects, DRAM connect and bus buffer for 6847. 6809 data bus connect still missing. One day I will re-draw those chips in a far more reasonable geometry. May the router do the job. 1-1 to PCB footprint is not reasonable. 

it IS a weird system design... bizarre, but ingenious

heck, I need to redraw it on multiple sheets, will take a little

Schematics... schematics... how, what file format, what software...? Have I mentioned that I am a bloody layman? - Another few hours online in the electronics design jungle.

I ended up with EasyEDA. So far I'm quite fine with it.

I finally cobbled something together which almost looks like a schematic, but it's very... unoptimized... :-)

I'm going to optimize it and clean it up a bit first, it's too embarrassing for publishing now, but confident it is basically working, though. Will be back asap, but I'm not too fast, as it is a pure hobby project happening besides life, work, cooking, pets and such.