hi all
i am looking for a very tiny board with 6502 CPU, ram, rom , rs232 and a portiIO.
Anything i could buy anyplace or any Eagle project i could re-use ?

let me know =)

Did you check out Daryl's SBC-2?
http://sbc.rictor.org/info2.html

I think he even might sell you one, but for that you must contact him.

Also, have a look at Grant Searle's MicroUK101: http://searle.hostei.com/grant/uk101/uk101.html and also check out Briel Computers for a couple of commercial kits ($110 and $150 I think.)
Cheers
Ed

@Dajgoro

never seen Daryl's SBC-2, it's very pretty =D

I don't have any more SBC-2 boards on hand. If there is enough interest, I could do another board order. We would need a minumum of 10 boards to make it worth the cost. Keep in mind this would just be a PCB.

Daryl


EDIT: 10 boards will result in a per-board cost of $25.10

_________________
Please visit my website -> https://sbc.rictor.org/

Yea, I was going to suggest the Micro-KIM, but it's not a "tiny board", so...

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

@BigDumbDinosaur

i don't know the POC project, i am reading now the topic
it seems nice, as you have indicated in your topic i will contact you by PM.

portIO, is just a latched bidirectional In/Out port, and 8bit are OK.
i mean i do not need nothing complex as a Programmable Peripheral Interface
for example the intel 8255, originally developed for 8085 SBC:
a memory mapped latch, with 8bit @ 1mA source/sync current each, is enough for me.

legacy, going with an I/O IC like the 6522, although it has a lot more in it, actually makes construction easier:

• you only have to wire the data bus, power, ground, and select pins once for two 8-bit ports plus auxiliary I/O like for handshaking or synchronous serial port
• having CS, CS\, and phase-2 inputs makes your glue logic much simpler

Then you get additional things you will want later, like the timer/counters, synchronous-serial port, and several interrupt sources. On my first home-made computer, I used 8-bit latches for output and 8-bit buffers for input, and it turned out to be far more work, take far more space, and not be very useful, compared to later ones.

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

It's a good lesson, that simplest isn't quite the same as minimal.

Perfect

Apatco has two versions of their computer. If you are starting from scratch and don't know a lot, it might be one of the ways to go because they have manuals.

i have realized this extremely easy board around 80C32 using the intel basic
- cpu 80C32@11Mhz
- 32Kbyte static ram
- 32Kbyte eprom, 8Kbyte of intel basic'51, the rest is 0xff
- 2 latch, 8 bit IN, 8 bit Out, with 5mA of sync/source
- onboard TTL to RS232 adapter and reset

i have designed and realized it with toner transfer: it is a very rude and crude home made tiny SBC



any URL to Apatco's tiny computer ?

Brace yourself: it's $190
PCB based, 65816: http://www.apatco.com/shop/index.php?productID=674
breadboard based, 6502: http://www.apatco.com/shop/index.php?productID=667
(product detail at http://www.apatco.com/products2.php and http://www.apatco.com/products.php)
Cheers
Ed

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