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  • falter's Avatar
    Today, 05:12 PM
    falter replied to a thread Midwest 6800 in Other
    It worked! I corrected the code by manually changing memory addresses, then punched it back out: S1130000FEF0006E00FEF0066E00BDE15CBDE1DFB7...
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 03:59 PM
    falter replied to a thread Midwest 6800 in Other
    Okay so after an hour or so of painstaking (and painful) checking, I believe I have found 4 errors in the S record, probably a result of the OCR...
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 02:03 PM
    falter replied to a thread Midwest 6800 in Other
    Okay so I took the S19 file and dumped it to notepad.. and then used a macro to separate the bytes (and checksum) out. I've already found what...
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 01:34 PM
    falter replied to a thread Midwest 6800 in Other
    Yeah something isn't right here. I burned the third EPROM... when it finished, I ran a Verify... it said no problem. I then forced it to dump the...
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 01:21 PM
    falter replied to a thread Midwest 6800 in Other
    I managed to get the 6800 going again with a different RAM board. I've got 4 erased 2708s (NOS), and I've attempted burns on 2 of them. In each...
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 12:52 PM
    falter replied to a thread Midwest 6800 in Other
    Dang. My 6800 is failing somewhere. It's refusing to post properly about half the time I start it, and now the S records that worked perfectly...
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 10:45 AM
    falter replied to a thread Midwest 6800 in Other
    Correction... L (Load) seems to produce a response.. asks if I want to echo and then where to read from. But nothing else so far.
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 10:43 AM
    falter replied to a thread Midwest 6800 in Other
    Ok so the good news is.. when I fire up with this EPROM, I get a * prompt. The bad news is, none of the commands work. I hit M for example and it...
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 10:16 AM
    falter replied to a thread Midwest 6800 in Other
    Weird. So I burned the EPROM. Then it printed off a list of what looked like every memory location and byte burned to the chip, followed by an H....
    45 replies | 1371 view(s)
  • falter's Avatar
    Today, 10:10 AM
    falter replied to a thread Midwest 6800 in Other
    Thanks Monty! That file worked! And I checked some of the bytes on the 6800 after it was loaded in and they seem to line up! Saved me a ton of...
    45 replies | 1371 view(s)
  • falter's Avatar
    Yesterday, 11:05 PM
    falter replied to a thread The Ebay Follies in Rants
    Whatever that camera is it's got a weird perspective. I thought that Miniscribe was a Miniature when I saw the photos.
    760 replies | 87250 view(s)
  • falter's Avatar
    Yesterday, 06:21 PM
    falter replied to a thread Midwest 6800 in Other
    No it didn't work unfortunately. I remember running into this with the DREAM 6800 ROM code. I'm thinking maybe it'd accept S19?
    45 replies | 1371 view(s)
  • falter's Avatar
    Yesterday, 06:01 PM
    falter replied to a thread Midwest 6800 in Other
    Thanks so much Monty! I will give this a try immediately! I seem to recall having trouble with these S rec files the last time I attempted this,...
    45 replies | 1371 view(s)
  • falter's Avatar
    Yesterday, 01:05 PM
    Yes I suspect there is some sort of magic. I can see what looks like a jumper that can be soldered to different positions. The CPU board has four...
    12 replies | 205 view(s)
  • falter's Avatar
    Yesterday, 10:04 AM
    Thanks Dwight... yeah I understood about how we are using the SWTPCs RAM between $0000 and $03ff as a holding place to put data to send to the...
    12 replies | 205 view(s)
  • falter's Avatar
    Yesterday, 09:14 AM
    falter replied to a thread Midwest 6800 in Other
    Whatever you're doing it's working really well! Haven't found any errors so far! Thanks again for doing this. Will save me an immense amount of...
    45 replies | 1371 view(s)
  • falter's Avatar
    December 14th, 2018, 09:07 PM
    Thanks Dwight. Am I correct in my assumption that I can just convert the Exxx addresses to 0xxx for the purposes of using my Microworks card, and...
    12 replies | 205 view(s)
  • falter's Avatar
    December 14th, 2018, 08:17 PM
    falter replied to a thread Midwest 6800 in Other
    Thanks Larry. Checked up to E0A0 - looked perfect. However there is a chunk missing from E0A0 to E3C2 in what you posted there.
    45 replies | 1371 view(s)
  • falter's Avatar
    December 14th, 2018, 07:01 PM
    falter replied to a thread Midwest 6800 in Other
    The part I can't figure out is on the last page. As I mentioned in another thread... my 2708 programmer has you enter addresses in my SWTPC 6800's...
    45 replies | 1371 view(s)
  • falter's Avatar
    December 14th, 2018, 04:28 PM
    Okay that's what was confusing me. Because on the first page of the guide it says the MSIBug monitor is provided on *a* 2708. It doesn't say...
    12 replies | 205 view(s)
  • falter's Avatar
    December 14th, 2018, 03:40 PM
    DaveH was kind enough to locate a listing of MSIBug for me. I've posted it here: ...
    12 replies | 205 view(s)
  • falter's Avatar
    December 14th, 2018, 02:45 PM
    falter replied to a thread Midwest 6800 in Other
    I was just going to ask if someone knew how to do that from the listing. If I can get that into s-rec format I can use my 2708 burner to burn a new...
    45 replies | 1371 view(s)
  • falter's Avatar
    December 14th, 2018, 10:54 AM
    Doh! Many thanks. Can't believe I missed that!
    2 replies | 122 view(s)
  • falter's Avatar
    December 13th, 2018, 08:54 PM
    A weird one that has left me scratching my head a bit. When I use Chrome, the site looks like this: It just started doing that recently. ...
    2 replies | 122 view(s)
  • falter's Avatar
    December 13th, 2018, 08:07 AM
    Yeah I don't know if I won or if he gamed me. I don't even know if I could repurpose it... the missing box with the terminal boards also has the...
    3 replies | 200 view(s)
  • falter's Avatar
    December 12th, 2018, 09:21 PM
    Oops. I got into a bidding war with the dreaded b*****a. He really wanted this thing bad and we kept bidding back and forth for about 30 minutes...
    3 replies | 200 view(s)
  • falter's Avatar
    December 11th, 2018, 08:27 PM
    Aha! I found a cache of KeyEdit docs! Whole lot is clearer now. It appears from the service guide (link below) that I have a MK 1 terminal. ...
    1 replies | 78 view(s)
  • falter's Avatar
    December 11th, 2018, 04:25 PM
    It showed up today! Took a while thanks to the postal strike. Anyway, I decided to follow EEVblog's advice and 'tek it apaaat'' … so here's some...
    1 replies | 78 view(s)
  • falter's Avatar
    December 10th, 2018, 04:36 PM
    I don't know why but I don't really get excited for software as a collector. It's kind of odd I think given computers are useless without software....
    15 replies | 553 view(s)
  • falter's Avatar
    December 10th, 2018, 12:36 PM
    Question: is the source code for the AGI games not already out there? Isn't that what that AGI Studio was built on? Or was that reverse engineered?
    15 replies | 553 view(s)
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74LS244 Question

by falter on December 5th, 2018 at 01:21 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

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The Ebay Follies

by falter on June 25th, 2017 at 11:09 AM
All hail the $3000 Apple II+!

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