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  • daver2's Avatar
    March 12th, 2017, 04:17 AM
    daver2 replied to a thread Some weekend finds in Commodore
    Nope, The keys are arranged as a matrix of rows and columns (see http://www.6502.org/users/andre/petindex/keyboards.html). To simulate a key you...
    16 replies | 465 view(s)
  • daver2's Avatar
    March 9th, 2017, 11:05 PM
    I thought Turbo Pascal was one of the best language packages I ever bought and used. I also agree about the OO stuff - avoid like the plague! ...
    22 replies | 635 view(s)
  • daver2's Avatar
    March 9th, 2017, 01:55 PM
    So I wonder how much of your 1.5 MB of memory are actually being used? The errors are probably due to missing data files. ADVENT is the program...
    15 replies | 593 view(s)
  • daver2's Avatar
    March 9th, 2017, 12:24 PM
    daver2 replied to a thread PDP 11/45, Part 5 in DEC
    Hey Marty - long time no hear. How are you keeping? Nice to see you back to the wire wrapping again! I have just put some pictures of my 11/45...
    280 replies | 16513 view(s)
  • daver2's Avatar
    March 9th, 2017, 11:50 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    Ral-Clan, All programmable ROMs suffer from ageing. An EPROM is only specified for data retention for 10 years, and fusible ROMs suffer from fuse...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 8th, 2017, 11:07 PM
    What I was saying (perhaps not too well) is that the TSX manual was describing how to load TSX under RT11 and what the user would need to look at if...
    15 replies | 593 view(s)
  • daver2's Avatar
    March 8th, 2017, 10:55 PM
    daver2 replied to a thread Sick SuperPET in Commodore
    Thanks Mike. Sure does! Hi-res scans are not necessary. Real-clan provided me with scans of his card off-board a while ago (but with no rulers...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 8th, 2017, 01:08 PM
    daver2 replied to a thread Sick SuperPET in Commodore
    Ral-Clan, I have been reviewing your photographs and measurements and have come across a feature on the SuperPET PCB that I haven't actually...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 8th, 2017, 10:56 AM
    Hey MikeS. You were posting in the other thread that I have just replied to a moment ago. Well, two Commodore guys telling the OP to do the...
    71 replies | 1539 view(s)
  • daver2's Avatar
    March 8th, 2017, 10:54 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    But if you look at table 3 (operating modes) of the data sheet (I am using...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 8th, 2017, 10:43 AM
    As this is your first post - welcome to VCFED. The VIA is a chip with the number 6522 in it. There is one of these in a PET. The PIA is a chip...
    71 replies | 1539 view(s)
  • daver2's Avatar
    March 8th, 2017, 10:14 AM
    Did a bit of looking around and identified this text in the TSX-Plus system Manager's Guide. OK - it is loading TSX-Plus under RT11 - but it may...
    15 replies | 593 view(s)
  • daver2's Avatar
    March 8th, 2017, 03:15 AM
    Yep, wires on the bottom - following the original tracks - is the way to go. +1 to KC. Looking good and working is even better! Dave
    32 replies | 1143 view(s)
  • daver2's Avatar
    March 7th, 2017, 10:40 PM
    daver2 replied to a thread Sick SuperPET in Commodore
    If you don't follow the data sheet specifications, then it is down to the specific manufacturer as to whether the device will work or not. For...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 7th, 2017, 10:24 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    HOSTCM is written in C and I have just compiled it on my iMac without a hitch using 'make'. I can (supposedly) run it with a USB serial device...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 7th, 2017, 12:40 AM
    If there are only 24 pins soldered to the PCB on the underside, then the 'someone' who attempted your repair probably replaced the 24 pin sockets...
    32 replies | 1143 view(s)
  • daver2's Avatar
    March 7th, 2017, 12:29 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    I would just like to correct a very slight discrepancy: >>> ... they have all been recompiled to run without it: The disk images were patched...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 6th, 2017, 05:37 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    It 'does'. See http://www.vintagecomputer.net/browse_thread.cfm?id=580 - but you can only copy some of the PRG files due to space constraints. I...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 6th, 2017, 05:22 AM
    Well done - and in your sleep too! When you said about the SPL instruction it did seem strange at the time - but I looked it up in my little...
    7 replies | 202 view(s)
  • daver2's Avatar
    March 6th, 2017, 05:14 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    Nice... Yes, a dual disk drive is really required for the SuperPET software me thinks... I like the look of your 'computer room'. Being in...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 6th, 2017, 04:44 AM
    There is a small indentation in the plastic next to pin 1 of each IC. These are in the upper left-hand side of each IC in your photograph. Pins are...
    32 replies | 1143 view(s)
  • daver2's Avatar
    March 5th, 2017, 10:39 PM
    daver2 replied to a thread Sick SuperPET in Commodore
    Better having two different solutions than none at all! Not an 'insignificant' repair. You did well Padawan! No pictures of the working 6809...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 5th, 2017, 01:07 PM
    I assume you are entering the octal codes from the listing into your PDP via ODT? I am just looking at your CALL instruction. It has assembled to...
    7 replies | 202 view(s)
  • daver2's Avatar
    March 5th, 2017, 11:02 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    Ral-Clan, You're the man :-)! Now I haven't got any excuse not to finish off my SuperPET add-on board I am designing... EDIT: Just checked...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 5th, 2017, 10:58 AM
    Two things spring to mind: 1. You are using CALL and RETURN instructions that use the stack - but nowhere do you set the stack pointer (R6) up....
    7 replies | 202 view(s)
  • daver2's Avatar
    March 5th, 2017, 08:34 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    Almost again... but closer! Pin 1 of the 7404 should not go to +5V (as you have drawn) but to pin 21 of the middle socket (i.e. /NOROM from the...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 5th, 2017, 06:29 AM
    daver2 replied to a thread Sick SuperPET in Commodore
    Almost... I assume pin 8 of the 7404 (dark blue wire) goes to pin 18 of the upper socket (EPROM) and that pin 1 of the 7404 (red wire) goes to pin...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 4th, 2017, 11:47 PM
    daver2 replied to a thread Sick SuperPET in Commodore
    You can modify the 74LS02D logic to use some of the spare inverter gates that we are not using to 'merge in' the additional address line. I can...
    307 replies | 11550 view(s)
  • daver2's Avatar
    March 4th, 2017, 12:34 PM
    daver2 replied to a thread AC30 goes south in Other
    So what's wrong with the KIM-1? Dave
    12 replies | 310 view(s)
  • daver2's Avatar
    March 4th, 2017, 10:29 AM
    daver2 replied to a thread AC30 goes south in Other
    It sounded like a bad contact. So you are good now? Dave
    12 replies | 310 view(s)
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SW/HW design engineer

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