Do you have some RAM at $A000+ yet?
That's all that should matter as far as required RAM goes.
Presuming this is the holley page you were referring to:
http://www.swtpc.com/mholley/HiTerm/Test6800_Index.html
he does mention RAM needed at A000 for the BUGs, as Chris and I have been
saying.
Without RAM there there's no stack for return addresses for subroutines
executed in the BUGs, so execution could head off to wherever.
On 2016-Aug-05, at 10:23 PM, Brad H wrote:
> Okay so.. I decided to try the MP-C board out, just for kicks. No change.
> Then I decided to add one of the RAM boards.. the next one up in addresses.
> Got a little bit when I powered on. Added one of the old MPM boards.. one
> that has memory chips all piggybacked on one another. Now when I powered up,
> the system was sending four or five characters at a time, linefeed, four or
> five characters at a time, linefeed ad infinitum. I added the final MPM
> board.. zero.
> So.. I think we do have some ram problems.. most likely. I'm thinking it
> would be easiest to concentrate efforts on the socketed RAM boards.. test all
> the RAM out. I'm going to read up on addressing and try to understand a bit
> better what is going on. I'm thinking maybe I need to reconfigure the
> addressing on one of the boards to match whatever that overstuffed MPM board
> is set to.
> Until I get an oscilloscope.. fooling around is about all I can do here.
>
> Sent from my Samsung device
>
> -------- Original message --------
> From: Chuck Guzis <[email protected]>
> Date: 2016-08-05 3:55 PM (GMT-08:00)
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <[email protected]>
> Subject: Re: SWTPC 6800
>
> On 08/05/2016 02:15 PM, Brad H wrote:
>> I think I will have to figure out how to do that. Additionally I
>> have one of those PC based oscilloscopes on the way. I don't know
>> how to use them 100% but I'm about to learn I guess. :)
>>
>> I have one more question for you guys -- I have a few CT-1024
>> terminals and would really like this system to work with one of
>> those. However, all of the CTs are quite delicate and are set I
>> think for 7, E, 2 @ 110 baud via soldered jumpers. I'm a bit
>> reluctant to try pulling them apart to get in there and fix that. Is
>> there a way to change the parity, etc settings on the SWTPC to match
>> the terminal? Is it necessary?
>
> Well, 110 bps is a bit on the slow side--great for teletypes, not so
> much for video terminals. But you'll have to change the hardwired
> jumpers--the UART used in the CT1024 is not software-programmable.
>
> If this were my unit, I"d probably solder some pins into the pad holes
> and then either use slide on jumpers or wirewrap to set the
> characteristics. That way, when changing things around, you won't be
> stressing the PCB.
>
> Something like this:
>
> http://www.ebay.com/itm/10PCS-20CFemale-to-Female-1-Pin-Plug-Jumper-Cable-Wires-Multicolor-K-/262158878688?hash=item3d09e307e0:g:B-MAAOSwwE5WVLR6
>
> Search on "female jumper wires"
