Image Map Image Map
Tab Content
  • falter's Avatar
    Today, 08:11 PM
    I decided to put this on the bench and get it apart to check things. The first thing I wanted to do was make sure the Character generator ROM was...
    13 replies | 937 view(s)
  • falter's Avatar
    March 16th, 2019, 12:10 PM
    falter replied to a thread Nascom in Other
    Ah.. I found the mistake... I didn't put a space in between the quotes in line 50. Doh. Now it works - although the snow effect is so bad as it...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 16th, 2019, 09:31 AM
    falter replied to a thread Nascom in Other
    One other thing I don't remember BASIC doing that it does now.. if I do a list... it'll do the first five lines or so and then stop, and then I have...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 16th, 2019, 09:29 AM
    falter replied to a thread Nascom in Other
    So far so good. I tried to do a little 'test' program I have in my head... didn't quite work as imagined. Basically I do something like this: 10...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 16th, 2019, 09:01 AM
    falter replied to a thread Nascom in Other
    Interesting. I decided to try swapping out the 74S04 in IC9 with another. I didn't have another S04 but I did have a brand new 7404. So I put...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 16th, 2019, 08:52 AM
    falter replied to a thread Nascom in Other
    Made a quick check in between family stuff... there is no cap installed for IC9. It is a 74s04. There is also a 74s04 next to it in ic10.
    223 replies | 15415 view(s)
  • falter's Avatar
    March 15th, 2019, 04:15 PM
    falter replied to a thread Nascom in Other
    Yes I've been a bit negligent with this office PC but now we seem to be on a happier path. Anyway, I got the scanner installed, here's both sides...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 15th, 2019, 02:36 PM
    falter replied to a thread Nascom in Other
    Thanks Dave. I have been dealing with a meltdown in my main PC so I haven't been able to do much except replace the 7402... just to see if it made...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 13th, 2019, 08:49 PM
    falter replied to a thread Nascom in Other
    Strange... yeah this is over my head -- don't really understand why there's a 7402 involved but I see one of its legs is plugged into where the...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 13th, 2019, 03:53 PM
    Well, I'm using them for actual vintage computer projects -- like for example, I have all the parts for a digital group 8080 system here but lack an...
    22 replies | 308 view(s)
  • falter's Avatar
    March 13th, 2019, 03:44 PM
    I wish I could find somewhere to get replacement keycaps for my SWTPC CT82. Is it super expensive getting them made? The SWTPC has kind of a dark...
    22 replies | 308 view(s)
  • falter's Avatar
    March 12th, 2019, 08:57 PM
    Gah. I shut down my PC - no problem... started back up... boom, blue screen of death. Restarted... now all I get is a black screen with an...
    6 replies | 158 view(s)
  • falter's Avatar
    March 12th, 2019, 07:10 PM
    This is the only thing I could find about the Scientific Devices keyboard: ...
    22 replies | 308 view(s)
  • falter's Avatar
    March 12th, 2019, 05:47 PM
    I ended up buying these two: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F223439007393 ...
    22 replies | 308 view(s)
  • falter's Avatar
    March 12th, 2019, 07:55 AM
    These Microswitch units always seem to grab big bucks. ...
    22 replies | 308 view(s)
  • falter's Avatar
    March 12th, 2019, 07:37 AM
    falter replied to a thread Nascom in Other
    I'll try to check that when I finish work... sort of think I can figure out how. I was looking around for a schematic for this card but no luck. ...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 12th, 2019, 06:44 AM
    falter replied to a thread Nascom in Other
    Basically what happens when it goes sideways is you can only use and modify 0000-0FFF. All other RAM is locked down. The contents of everything...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 10th, 2019, 06:16 PM
    falter replied to a thread What machine is this? in Other
    My guess would be some rando CPM thing or maybe a word processor. Very cool looking. But for a few more points of resolution you could read the...
    5 replies | 173 view(s)
  • falter's Avatar
    March 10th, 2019, 03:48 PM
    falter replied to a thread Nascom in Other
    RAM has all been tested in the working A2+ and all comes up just fine. So what seems to be happening is the Nascom is somehow 'losing' much of its...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 10th, 2019, 12:53 PM
    Generally I'd be in agreement that politics are not a good idea in today's environment, especially in a small community that cannot afford...
    45 replies | 1243 view(s)
  • falter's Avatar
    March 10th, 2019, 10:19 AM
    falter replied to a thread Nascom in Other
    Dang.. ok it seems my 'test mule' has issues of its own. It started corrupting the screen again in the exact way it had prior, and even when I...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 10th, 2019, 10:02 AM
    falter replied to a thread Nascom in Other
    Yeah, I *think* this is RAM. It's interesting.. it plays out very similarly in my II+ test mule. I can plug the whole bank in and it'll power up...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 10th, 2019, 09:44 AM
    falter replied to a thread Nascom in Other
    Aaaand we're back to not recognizing the ROMs again. No idea what's going on. Going to test and restest both RAM banks. I have a feeling dodgy RAM...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 10th, 2019, 09:34 AM
    falter replied to a thread Nascom in Other
    Okay so it is still working this morning... albeit one time it didn't.. it mostly will allow me to run BASIC, etc. One persistent issue is the...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 9th, 2019, 07:59 PM
    falter replied to a thread Nascom in Other
    Ahhh.. I think we've got bad RAM. I took the first bank of RAM out, put it in my Apple II+ test mule and ran the diags. On the first round it...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 9th, 2019, 07:42 PM
    falter replied to a thread Nascom in Other
    Nope. Something totally random is going on.. worked through several restarts and then when I left it for a couple hours and tried again.. back to...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 9th, 2019, 06:08 PM
    I just noticed it isn't there anymore..
    45 replies | 1243 view(s)
  • falter's Avatar
    March 9th, 2019, 03:32 PM
    falter replied to a thread Nascom in Other
    Changed out an 81LS97 on the buffer board at I think it's IC2 (hard to read the silkscreen) that I had swapped around.. now they're working again. ...
    223 replies | 15415 view(s)
  • falter's Avatar
    March 9th, 2019, 03:27 PM
    falter replied to a thread Nascom in Other
    I had a look at memory contents while it's behaving like this. I looked at B800 and E000 and went through a few addresses.. they're all 7E.
    223 replies | 15415 view(s)
  • falter's Avatar
    March 9th, 2019, 03:24 PM
    falter replied to a thread Nascom in Other
    It appears to still be having some randomness issues. I just fired it up after leaving it and it will not enter either of the ROMs right now. ...
    223 replies | 15415 view(s)
More Activity
About falter

Basic Information

About falter
Location:
Vancouver, BC

Statistics


Total Posts
Total Posts
4,087
Posts Per Day
1.37
General Information
Last Activity
Today 09:42 PM
Join Date
January 21st, 2011
Referrals
0
View falter's Blog

Recent Entries

74LS244 Question

by falter on December 5th, 2018 at 12:21 PM
Quote Originally Posted by Chuck(G) View Post
Assuming that pin 1 stays high, it should be possible to "feed through" pin 8 to pin 12. But the solution ultimately will be figuring out why pin 1 stays high.
Yeah that is is the goal for sure. I just want to prove out my theory a bit. After the experience with the TVT I don't trust schematics or circuit descriptions 100%. I did try feeding through but didn't see any text appear... although I didnt type anything so maybe it would only change new text being added. I'm

Read More

Categories
Uncategorized

The Ebay Follies

by falter on June 25th, 2017 at 10:09 AM
All hail the $3000 Apple II+!

http://www.ebay.com/itm/142424958928
Categories
Uncategorized