Good news, everyone it is working, I can now communicate with the board via serial terminal.

Thank you all for your advice, suggestions and constructive criticism.

I'm just going to wait until the serial card that I ordered for my pc to arrive, I'll make a custom cable for it and report back my findings.

I measured the voltage at idle at the db9 connector on the digiac it reads -9v

I did some research, apparently you can reprogram the firmware on the ftdi ft232r to invert the tx and rx lines.

after several hours of messing around I reprogrammed my converter with inverted signals.
Now when I try to ...

Hi Neil,
I connected the logic analyser to serial port CH.A coming out of the Digiac board. as I mentioned in a previous post the pinout is non standard pin 1 is TX1 Pin 6 is RX1. I had to make a custom cable which I broke out onto a breadboard so I could connect the ftdi ft232rl adapter and the ...

I agree, I will try it again when the serial card for my pc arrives, maybe the ftdi chip is inverting the signal.

Sorry, the first trace the one on channel 1 of the logic analyser is the txd line coming from the digiac. The second trace, the one on channel 0 is data I sent from the serial monitor on my computer ascii 'k' 0x6b .

the hexdump is the actual data transmitted by the digiac on a cold boot, my serial ...

]I tried sending a bunch of ascii 'k's to the board using the serial monitor, my logic analyser interpreted those correctly.

Logic_Analyser-Digiac_RX-k.png[/attachment

I've ordered a pci express serial card that I can put in an old pc that i have lying around, maybe that will yield different ...

Thanks Big Ed,



I thought it probably was 9600, still no luck though, this is the output to the serial monitor. :

00000000 00 9E 96 2D 73 A5 93 27 C9 24 4B 39 7A 39 F2 93 ...-s..'.$K9z9..
00000010 A5 48 23 91 4D 49 19 7E CA FA C9 C9 E6 33 A6 99 .H#.MI.~.....3..
00000020 66 E6 F3 33 65 66 9A 33 ...

Hi my name is Joseph,

I have one of these MACIII 6502 trainer boards with a keypad display and an applications module.
I managed to dump the rom using a microcontroller.
The board is working fine using the keypad.

My question to you guys is has anyone managed to successfully connect to the board ...