Martin Maly followed Štěpán Bechynský

7 months ago

Martin Maly respected BigClown to Excel Online integration

7 months ago

Martin Maly published OMEN Kilo

10 months ago

Martin Maly commented on OMEN Alpha

10 months ago

Hello. The assembler I have used is the https://www.asm80.com - my online universal 8bit assembler (online as well as command line). See ...

Martin Maly commented on OMEN Bravo

10 months ago

Hi Giovanni, that was my goal - to trip back into 80's, but with all possibilities we have nowadays. OMEN Alpha and Bravo are just the PO...

Martin Maly added SparkFun Pushbutton switch 12mm to their toolbox

a year ago

Martin Maly published OMEN Bravo

a year ago

Martin Maly commented on OMEN Alpha

a year ago

It does not depend on UART type. You have to gate output enable of the UART with ALE signal, that's the whole magic.

Martin Maly commented on OMEN Alpha

a year ago

Excuse me: not 75245, but 74245, the difference is important. And yes, this driver is needed, because UART is not fully decoded and gated...

Martin Maly commented on OMEN Alpha

a year ago

I believe that this change has no significant influence. I have tested both versions, CMOS 80C85 as well as NMOS 8085, and it works perfe...

Martin Maly commented on OMEN Alpha

a year ago

5V stabilized, 1500 - 2000 mA. USB power adapter / charger should fit.

Martin Maly commented on OMEN Alpha

a year ago

I have used HC/HCT, but it is not critical I hope. LS has bigger power consumption, but it's not a very big problem here...

Martin Maly commented on OMEN Alpha

a year ago

10M is 10 μF, 6.8 without a sign means 6.8 pF... I am sorry for such unclarity.

No, 3.6864 MHz with this circuit is essential for a ser...

Martin Maly commented on OMEN Alpha

a year ago

Long story short: Crystal oscillator has to be as close as it could be to the CPU. The best practice is to fill the whole area around the...

Martin Maly commented on OMEN Alpha

a year ago

16x2 or 20x4 LCD are ready to test, keyboard needs a little bit of soldering, but I hope this weekend I will do both.

Martin Maly commented on OMEN Alpha

a year ago

I am afraid the biggest change is the need of own baud rate generator, much slower than the system clock. You can take the TxC, RxC frequ...

Martin Maly commented on OMEN Alpha

a year ago

No big deal. I have some MC68B50s here and only one old Soviet 8251, that's the first reason. The second one: the 8251A seems to be a muc...

Martin Maly commented on OMEN Alpha

a year ago

Photo gallery added... It's just a prototype.

Martin Maly commented on OMEN Alpha

a year ago

I guess there are such books in English, from 80's. I will try to look for some of them in my library at weekend...

Maybe Google Transla...

Martin Maly commented on OMEN Alpha

a year ago

Give me a couple of day, please 😃