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  • Ral-Clan's Avatar
    Today, 05:08 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Yes, it does. Yes, it does. I also get the checksum 502344. Note: I only tested ROM 970020-12, extracted from U49 on the SuperPET...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Today, 03:11 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Sorry, I don't know why this forum shrinks attached pictures. The picture I uploaded was much larger. Here's an external link to the schematic...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Today, 01:55 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Okay Dave, will do and report back here. Daver2, I did pull out the SuperPET daughterboard and did a continuity check on the pins of U49 to...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Today, 09:05 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Okay guys, Here are the results of the latest test using the logic probe. SuperPET ROM test at U47, U48, U49. Method: - logic probe power...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Today, 07:43 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hi Dave, How do I check the three ROM chip selects?
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Yesterday, 03:20 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hey guys, I haven't probed the 6809 yet, but I am assembling an order of electronics parts I need for future steps in this repair (IC sockets,...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Yesterday, 12:05 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    If, by IRQ lines, you mean pin 3 of the 6809, then I didn't see any pulsing. Only a high signal. But that is what Daver2 told me to expect, so I'm...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Yesterday, 11:22 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Okay, so when you say that I need to probe the address lines, you mean I need to test pins 8 to 23 (A0 to A15) on the 6809 to see if they are...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    Yesterday, 10:32 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hi guys! (I finally got my avatar to display) An update with some useful information Finished testing the 6809. With SuperPET's 6809...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 17th, 2017, 05:01 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    QUESTION: When I am probing around for a +5V point on the SuperPET daughterboard with my multimeter, do I have to attach the ground probe of the...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 17th, 2017, 04:55 PM
    BertZonn, Even if you are never able to repair the monitor (and I think you probably will be able to find someone), I seem to remember that the...
    32 replies | 464 view(s)
  • Ral-Clan's Avatar
    February 17th, 2017, 08:22 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hi Daver2, Okay, thanks for the clarification on procedure. I will check and report back. Please also note that I have indeed built a 6502 NOP...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 17th, 2017, 07:17 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Okay, now previously in this thread Daver2 had suggested to check the following: I have only just learned how to use a logic probe when you...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 17th, 2017, 06:53 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hello everyone, I have an update on the SuperPET: The 2K EDIT ROM arrived from Dave_m. After installing this I am able to successfully switch...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 17th, 2017, 06:40 AM
    I'm sure I'm repeating information here, but just in case you still haven't heard the message: please be very careful inside the monitor. There are...
    32 replies | 464 view(s)
  • Ral-Clan's Avatar
    February 17th, 2017, 06:34 AM
    Products that allow MP3s to work with Commodore computers through the datasette port already exist. ...
    11 replies | 198 view(s)
  • Ral-Clan's Avatar
    February 12th, 2017, 05:49 PM
    Interesting, my PET has a late revision of the universal dynamic motherboard (8032089) but I guess that's no guarantee that the CRT motherboard is...
    14 replies | 320 view(s)
  • Ral-Clan's Avatar
    February 12th, 2017, 03:37 PM
    But in every document online about this killer poke there are two things I've read: 1. No one has actually come forward to say it's ever cooked a...
    14 replies | 320 view(s)
  • Ral-Clan's Avatar
    February 11th, 2017, 02:50 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hi Dave_m, I was thinking the same thing as you (see my UPDATE #2 added to post above) and it looks like I was adding to my post it just at the...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 11th, 2017, 01:45 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Okay, I find this whole method to switch between the sixteen 4K banks pretty confusing (or rather, the SuperPET's explanation of it VERY confusing...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 11th, 2017, 12:46 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hey Dave! You were right! After swapping the RAM chip at U24 this bank of memory passed! Now I just have to figure out how to enable the other...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 11th, 2017, 10:54 AM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hi Dave, May I ask how you are able to determine the fault is with RAM chip U24, in partcular? What about the faulty POKE location pattern gives...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 11th, 2017, 10:51 AM
    An important point to remember is that if you want to play the old PET games, you really want a 40-column machine with a "Graphics Keyboard", not the...
    32 replies | 464 view(s)
  • Ral-Clan's Avatar
    February 11th, 2017, 10:49 AM
    Ral-Clan replied to a thread What does this mean? in Commodore
    Yes, I did. Didn't do anything.
    6 replies | 264 view(s)
  • Ral-Clan's Avatar
    February 10th, 2017, 02:00 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Okay, and update: Dave_m and myself, working together, have found some issues that might explain why my SuperPET board no longer starts up. The...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 10th, 2017, 01:36 PM
    Hi, I'm reading about the certain keyboard shortcuts and CHR$ codes on the PET computer, and found this table from "The Complete Commodore Innerspace...
    6 replies | 264 view(s)
  • Ral-Clan's Avatar
    February 9th, 2017, 03:50 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Hi guys, I am currently testing the SuperPET RAM through software. Using this program:...
    165 replies | 6223 view(s)
  • Ral-Clan's Avatar
    February 6th, 2017, 06:12 PM
    Yikes! It does indeed! The first line is: That's kind of scary. If someone didn't know better they could really damage their PET.
    14 replies | 320 view(s)
  • Ral-Clan's Avatar
    February 5th, 2017, 12:43 PM
    Ral-Clan replied to a thread Sick SuperPET in Commodore
    Okay, so it sounds like I should be able to write a short program that works on the 6502 side which activates the daughterboard banks of RAM, then...
    165 replies | 6223 view(s)
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