I finally hooked all parts together that I was planning for the first simple system.
It's using a W65C02, a AT28C64 eeprom, a 74HC138 for address decoding and a 6532 RIOT I got from Jameco some weeks ago.
Serial I/O is done with a MC6850 that is easy to connect to a 6502 bus and also easy to program.
The whole thing runs at 1.8432 MHz to use the main clock also for the serial clock. It's a bit to fast for the R6532, because it's the 1MHz version, but the system seems stable.

Now I need to write proper code for this thing and then it will be moved to a prototype PCB.

From now on I can truly say that I've build my own system from scratch. After nearly 30 years this idea has come to life.

Mario.

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How should I know what I think, until I hear what I've said.

Great! You show it can be done!

Good job! Looks as though designing and assembly your unit was a real RIOT.

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Totally cool Mario. Same as me. Waited not quite 30, maybe 25 years to finally do it. Nearly cried when those LEDs starting flashing, the first time I applied power:

http://www.youtube.com/watch?v=TXWvmcBsQn0

Mine's a 6809, AT28C256 (own built EEPROM programmer), 6522, 6850, etc. Going to try integrating a AY 8192, so the baby can make some noises, next...

Makes a change from the day job of perl programming I'll say.

Lawrence

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8 bit fun and games: https://www.aslak.net/

Congratulation from here, too! Now you need a sticker for your MacBook that says "My other computer only needs 128 bytes of RAM" .