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5265

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

It's been quite a while however as I recall it's 7-BIT ASCII; not 8-BIT. -Neil
nbreeden2
Apr 5
#5265
 
5264

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

Wasn't there something a bit non-standard about the protocol that seemed to hang folks up, like mark parity instead of even or something like that? Rex. On
Rex Jolliff
Apr 4
#5264
 
5263

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

Did you try changing the baud rate on your terminal to see if one of the other rates works? Still sounds like a baud rate mismatch somewhere to me.
Craig Ruff
Apr 4
#5263
 
5262

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

... FWIW, BTS6120 is strictly 8N1 with the MSB ignored. Once you get OS/8 running things get a little more complicated. Bob
Robert Armstrong
Apr 3
#5262
 
5261

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

Yes, I've set my terminal to 7 bits... some places say to use 7N1, others say use Mark parity, I've tried them all, to no avail.
donald_burr
Apr 3
#5261
 
5260

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

Hi Donald, Don't know if it's been mentioned but did you set your terminal or terminal software serial port for 7-bit characters? Steve L.
shlafferty
Apr 3
#5260
 
5259

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

Ah, good idea. I'll try that after dinner tonight. I do in fact have a digital storage oscilloscope now. Still getting used to it; last time I touched an
donald_burr
Apr 3
#5259
 
5258

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

... Do you have a storage oscilloscope (digital or otherwise)? If so, set to trigger on the negative-going transition and watch the TxD line coming out of the
Dave McGuire
Apr 3
#5258
 
5257

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

I did see the part in the SBC6120 manual about how the serial port is wired up (interleaved as opposed to one-to-one) and I took that into account when making
donald_burr
Apr 3
#5257
 
5256

Re: FP6120 - purpose of 30HZ & SLU Break Enable, and which pins to u

I think that the 30HZ is needed to trigger the interrupt that invokes the code to keep the blinkenlights updated, and the SLU enables the break signal on the
Garrett Nievin
Apr 3
#5256
 
5255

Re: FP6120 - purpose of 30HZ & SLU Break Enable, and which pins to u

SLU break enable is section 2.7.1 in the SBC6120 User's Manual. On Fri, 3 Apr 2015 09:06:19 -0400
Garrett Nievin
Apr 3
#5255
 
5253

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

... Did you read the section of the manual that describes the proper pin mapping from the IDC to the DB9? Bob
Robert Armstrong
Apr 1
#5253
 
5252

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

Thanks for the suggestion. I checked the crystals and they are the correct values and are soldered into the correct locations (5.000 MHz at U1, 4.9152 MHz at
donald_burr
Apr 1
#5252
 
5251

Re: Help - SBC6120 assembled, passes self-test but getting gibberish

It sounds like either a jumper misconfiguration on the SBC6120 serial baud rate jumpers, an incorrect frequency crystal feeding the baud rate generator, or the
Craig Ruff
Apr 1
#5251
 
5250

Help - SBC6120 assembled, passes self-test but getting gibberish on

I finally put my SBC6120 together. Everything seems to be working fine - I see the LEDs go through their countdown as the various self-tests are performed,
Donald Burr
Apr 1
#5250
 
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