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  • daver2's Avatar
    Today, 03:56 PM
    if you send me a PM with your actual e-mail address I can send you the source code for the latest version. The assembler is online and referenced in...
    6 replies | 84 view(s)
  • daver2's Avatar
    Today, 10:28 AM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    I think I can confirm that the Board Bucket Interface card (as you have called the scanned image of it) doesn't appear to be used by either DDT or...
    69 replies | 5559 view(s)
  • daver2's Avatar
    Yesterday, 03:38 PM
    First of all can you define 'better' and 'optimal'? Smallest amount of memory, quickest execution - or the ability to easily read and understand...
    4 replies | 140 view(s)
  • daver2's Avatar
    Yesterday, 03:32 PM
    >>> Starting without the CPU installed wouldn't initialize the CRTC so you wouldn't get a picture at all or you'd get a pinpoint dot in the center of...
    6 replies | 84 view(s)
  • daver2's Avatar
    December 7th, 2018, 11:37 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Nice job (as usual)! Always a pleasure to help out with your projects - they certainly test out the brain! As the driver can detect a timeout...
    134 replies | 9050 view(s)
  • daver2's Avatar
    December 7th, 2018, 11:32 PM
    From your photographs I suspect something at fault with your video circuitry somewhere. Two things: Can you remove the character generator...
    6 replies | 84 view(s)
  • daver2's Avatar
    December 4th, 2018, 11:19 PM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    Thanks, will have a major download tonight! I think it was Monty (in an earlier post) identified a webpage that had a board bucket posted - and...
    69 replies | 5559 view(s)
  • daver2's Avatar
    December 4th, 2018, 02:58 PM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    Falter, I have downloaded side 1 of the CPU board - and those scans are perfect! I will download CPU side 2 tomorrow night - it is getting late...
    69 replies | 5559 view(s)
  • daver2's Avatar
    December 3rd, 2018, 01:54 PM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    Excellent. I will check them out tomorrow evening if that is OK? I have been out tonight for the first festive meal of the season... Dave
    69 replies | 5559 view(s)
  • daver2's Avatar
    December 3rd, 2018, 01:52 PM
    And Rochester Electronics has a minimum line item cost as well. We use Rochester at work. Excellent stock, branded parts with traceability - but...
    21 replies | 541 view(s)
  • daver2's Avatar
    December 3rd, 2018, 10:42 AM
    daver2 replied to a thread Tektronix 4051 Tape Emulator in Other
    First of all, welcome to VCFED. Congratulations on restoring yet another 4051! I think it may have been Monty who mentioned about the tape...
    4 replies | 107 view(s)
  • daver2's Avatar
    December 3rd, 2018, 10:34 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Let's keep the board bucket discussions to that thread, and carry on with the repair of the 4051 on this thread shall we? I think it would be good to...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 3rd, 2018, 07:04 AM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    Monty: The 'tape' I referred to was actually the BASIC command you enter to 'dump' the current program to the console serial port. Nothing to do...
    69 replies | 5559 view(s)
  • daver2's Avatar
    December 2nd, 2018, 01:51 PM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    Excellent, That sounds like a plan. Dave
    69 replies | 5559 view(s)
  • daver2's Avatar
    December 2nd, 2018, 12:57 PM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    This is my document as it stands: DDT === / Disassemble memory. < . ??? THE . IS ACTUALLY $BD ??? >
    69 replies | 5559 view(s)
  • daver2's Avatar
    December 2nd, 2018, 12:48 PM
    daver2 replied to a thread Tektronix 'Board Bucket' 6800 in Other
    OK. So, I am still trying to identify what the memory and I/O map is for the board bucket and the peripheral cards. This is what I know for...
    69 replies | 5559 view(s)
  • daver2's Avatar
    December 2nd, 2018, 11:06 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Note that this ebay listing is minus the box of electronics. Falter, I would like to see a bit more about the Board Bucket hardware itself. I...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 2nd, 2018, 08:07 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Just done the washing up and thought of exactly the same thing regarding the clock - just a crystal and a couple of capacitors needed. Disable the...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 2nd, 2018, 07:50 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Hi Jos, I would vote for the latter (i.e. a more classic system with compatible backplane & separate boards). I was going to wire wrap one up over...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 2nd, 2018, 06:27 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Why assume it is your fault Falter? We are actually doing something here that is fairly complex - we are trying to convert a program from one...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 03:36 PM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    So I expect to see a full-sized picture of Snoopy when I eat my breakfast tomorrow! Dave
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 01:00 PM
    Hi Andy, Got bored of Pacman and Space Invaders now?! Onto something else... Dave
    5 replies | 195 view(s)
  • daver2's Avatar
    December 1st, 2018, 12:56 PM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Mini Snoopy :-)! The scaling is in lines 3341 and 3342 (for X and Y respectively). 3341 X=X*130/1023 3342 Y=Y*100/800 You obviously want to...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 11:34 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Line 3260 should be: 3260 IF A>=64 THEN GOTO 3290 i.e. '=>' should be '>='. Just found another problem whilst looking. There is a PLOT...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 10:44 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    You are correct, the DATA line length is just slightly too long (I think by 1 byte)... We have to move some of the data around a bit to shrink the...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 09:27 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    >>> Given that the Board Bucket has two serial ports (I believe that's what the second port is), could we somehow connect a PC to that and feed the...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 06:34 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    Agreed (in the short term) - although it would be more impressive (in the long term) to load the programs from the 4051... >>> I'm crossing my...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 05:19 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    This is my first go at SNOOPY for your board bucket: 100 REM DRAW PROGRAM from fast graphics HEX data 110 REM "Z" WILL BE THE END OF FILE MARKER...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 03:42 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    What immediately comes to mind is to modify the BASIC version of what we find in part of Monty's graphics archive at...
    157 replies | 3331 view(s)
  • daver2's Avatar
    December 1st, 2018, 03:15 AM
    daver2 replied to a thread Tek 4051 Display Board issues in Other
    That is absolutely awesome :-)! You can enter the DDT commend 'H' to enter BASIC rather than type the actual start address and 'G'. Should save...
    157 replies | 3331 view(s)
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About daver2

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About daver2
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SW/HW design engineer

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