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  1. Thread: Pet Rescue

    by AndyG
    Replies
    15
    Views
    264

    My 6540 adapter boards appear to have the same...

    My 6540 adapter boards appear to have the same configuration as Mike. They have gone straight onto the board and worked without any mods.

    Andy
  2. Thread: Pet Rescue

    by AndyG
    Replies
    15
    Views
    264

    I too would be very interested in the...

    I too would be very interested in the modifications you needed to make to Jim's 6540/27xx adapters as I am in a middle of a project and will be using them.

    With regards to the ROMS, I too found...
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    Yes I did thanks Andy

    Yes I did thanks

    Andy
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    Hi Dwight I missed $PTR ...... opps!! :) ...

    Hi Dwight

    I missed $PTR ...... opps!! :)

    $SYS only saves to tape. As a side note one has to remember to type NEW after loading, to reset the basic pointers (as it loads from $800 to $.....)...
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    Hi Dwight There was nothing broken in the...

    Hi Dwight

    There was nothing broken in the forth part of the code. Your comment fix works, I just had to remember to put in the patch so it would process ‘ ( ‘ properly before pasting in the print...
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    Below should be a copy of the PET FORTH V1.2 with...

    Below should be a copy of the PET FORTH V1.2 with the addition of PRINT and also the comment fix. The code padding between 0400 and 0800 is actually the Basic 1 TIM I used to save the modified code....
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    Actually was able for read Consistently the 2364...

    Actually was able for read Consistently the 2364 ROMs from a 8050 by connecting CS to VCC on the 2364 (had a switched 24 adapter so tried it) and leaving pin 20 CE on the 2764 part of the adapter...
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    I think you are safe reading the 2316 eprom using...

    I think you are safe reading the 2316 eprom using the 2716 configuration on your programmer.
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    I have built a 2364 adapter for my eprom...

    I have built a 2364 adapter for my eprom programmer as per this webpage... I have been able to read 2364 masked ROMs using the 2764 device configuration.
    ...
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    The fact that print ds$ hangs and doesn’t report...

    The fact that print ds$ hangs and doesn’t report back with the DOS version tells me the digital board has not booted up properly.

    The PET cannot communicate with the 8250 floppy drive properly and...
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    Do you have an eprom programmer ? If I look at...

    Do you have an eprom programmer ?

    If I look at this article, page 9, bottom line there is reference to a flashing error light being done to a faulty GCR chip.
    ...
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    Can you post pictures of the inside of the 8250,...

    Can you post pictures of the inside of the 8250, include the digital board and also the analog board (thatís the one sitting over the floppy drives).

    Without checking mine, I think there are two...
  13. Ok to bump Drive 1 change I0 to I1 clean and...

    Ok to bump Drive 1 change I0 to I1

    clean and lubricate the rails on Drive 0 and also gently clean the heads on both drives with IPA.

    Then if it still errors, type PRINT DS$ from the command...
  14. If the carriage "broke" free then i would clean...

    If the carriage "broke" free then i would clean the rails and put some lubrication on them. move the carriage back and forth many times to ensure its truly free.

    OK. You may also need to send an...
  15. These are MPI floppy drives and not familiar with...

    These are MPI floppy drives and not familiar with them. On mine you can rotate the clamp on the stepper motor spindle with your finger as the carriages are directly driven via What looks like a long...
  16. With the power off, You should be able to...

    With the power off, You should be able to carefully rotate the head stepper motor and the head will move freely along. It is common for the grease on that drive screw to go hard so it may need...
  17. I just had a near identical problem on my chiclet...

    I just had a near identical problem on my chiclet PET.... turned out to be one of the 74ls157’s. these are worked hard.

    Andy
  18. Your feedback on padding the Edit rom 2k section...

    Your feedback on padding the Edit rom 2k section is good to know!
  19. Replies
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    Can confirm the special memory board (64k) works...

    Can confirm the special memory board (64k) works just on a Fat-40 variant... (4032) taking it to 96k total by using bank switched memory techniques.

    Andy
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    Dwight, I will try this in my working copy on...

    Dwight,

    I will try this in my working copy on Vice when I get a moment.... thanks.

    Andy
  21. When you start typing do you see the characters...

    When you start typing do you see the characters in multiple locations ?

    If I recall correctly, there was an article on repeating characters on the Tynemouth Software Blog and he found issues with...
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    $FFE4 : Get One character from the keyboard...

    $FFE4 : Get One character from the keyboard buffer

    Programming the PET/CBM by Raeto West is a great source of info for this.

    Andy
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    Dwight, I think I extracted the APPLE FORTH...

    Dwight,

    I think I extracted the APPLE FORTH binary correctly - see attached

    60284



    Andy
  24. Replies
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    Hi Dwight, lcww1 mentioned that he had listened...

    Hi Dwight, lcww1 mentioned that he had listened to the whole tape and there was nothing on it apart from the code he attached.

    As BASIC 1 was very buggy and the IEEE didn't work, I guess a disk...
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    Agree with Dave, this is defintely left over...

    Agree with Dave, this is defintely left over fragment code. It is incomplete. How it got there who knows ....

    This version of PET Forth would not have been a cheap upgrade .... the user would have...
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