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Type: Posts; User: cruff

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  1. Replies
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    It is best if you stop thinking of this system as...

    It is best if you stop thinking of this system as an 11/34. There is almost nothing left that is recognizable as an 11/34 except for the enclosure and the front panel. A J11 CPU will only look at the...
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    Good news. The headphone jack is used as a switch...

    Good news. The headphone jack is used as a switch to lower the drive level when a plug is inserted into the jack to avoid overdriving headphones. When there is no plug inserted, there are two...
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    If UM11 (LM380) was weak for some reason, you...

    If UM11 (LM380) was weak for some reason, you would likely get reasonable volume in headphones but not the speaker.

    You could test SR74 (1K) and SR75 (560) to see if they have their proper values,...
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    Have you tried disconnecting and reconnecting the...

    Have you tried disconnecting and reconnecting the speaker connector from the motherboard? Perhaps there is some corrosion on the connector pins.
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    The KDJ11-A manual (EK-KDJ1A-UG-001) states in...

    The KDJ11-A manual (EK-KDJ1A-UG-001) states in section 2.9.1 that the backplanes, memory and I/O devices must support 22-bit addressing. Section 2.9.2 states that if memory or memory addressed...
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    https://blog.toggl.com/mars-software-development/

    https://blog.toggl.com/mars-software-development/
  7. Oh, sorry, it is the Basic prompt. Like I said...

    Oh, sorry, it is the Basic prompt. Like I said I'm not very familiar with the Apple II series yet.
  8. I have the 658-4081 model IIgs keyboard on a ROM...

    I have the 658-4081 model IIgs keyboard on a ROM 1 IIgs, and today it seems to be behaving pretty reliably for the Ctrl-Apple-Reset reset operation. I've seen times in the past where it dropped into...
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    https://www.mouser.com/Connectors/D-Sub-Connectors...

    https://www.mouser.com/Connectors/D-Sub-Connectors/_/N-9gxxm?P=1ytcy2g...
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    Looking at Digikey and Mouser, the 19 pin D-sub...

    Looking at Digikey and Mouser, the 19 pin D-sub connectors are still made, but you probably won't like the prices for any of the ones with shorter lead time availability. Some are marked as ship from...
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    I expect it is relying on the Z80 to run the DRAM...

    I expect it is relying on the Z80 to run the DRAM refresh cycles. That is hinted at in the restriction of the longest DMA burst latency in the specifications section.
  12. Thread: Atex PDP-11/34

    by cruff
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    3,731

    You need to concentrate on identifying which...

    You need to concentrate on identifying which serial port is the ODT console port that the J-11 CPU will talk to if it is configured to enter ODT at reset. This port is also commonly used by the DEC...
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    I ran it from a telnet session on 7.3 and it...

    I ran it from a telnet session on 7.3 and it wrote its output to my telnet session without problem.
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    Here are the numbers for a VAXstation 4000/60...

    Here are the numbers for a VAXstation 4000/60 running OpenVMS 7.3:

    0000.0300
    0001.1700
    0008.7002
  15. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    3,731

    Did you measure across the -15 V and +15 V lines?...

    Did you measure across the -15 V and +15 V lines? If so, then 30 V would be correct since there would be a 30 V potential across both. You need to measure each one individually against ground to...
  16. Thread: Atex PDP-11/34

    by cruff
    Replies
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    3,731

    If you have an oscilloscope, that would give you...

    If you have an oscilloscope, that would give you a lot of flexibility in problem solving. If not, can you get ahold of some type of RS-232 breakout box with LED indicators, or something like I bought...
  17. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    3,731

    Was everything cabled up when you got the system?...

    Was everything cabled up when you got the system? If so, you did record where every cable went? Is there a DLART on the CPU board? That will almost certainly be the console port.
  18. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    3,731

    The panel board marked Workstation III/LAN...

    The panel board marked Workstation III/LAN mentions Thinnet and AUI, which are commonly used to describe Ethernet cable variants. If you get an AUI to Twisted Pair adapter (i.e. RJ45 connectors),...
  19. Thread: Atex PDP-11/34

    by cruff
    Replies
    28
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    3,731

    Since the CPU board has a J-11 on it, it will...

    Since the CPU board has a J-11 on it, it will have built in ODT, which if you can figure out how to configure the board to set the power up mode bits (in the configuration regsiter) appropriately,...
  20. I am now pursuing this for the HP 98x5 series of...

    I am now pursuing this for the HP 98x5 series of computers after I was not able to get my 98035A clock interface to an operational state after the battery had leaked on it years before I got it. The...
  21. You can scavenge key parts from some of the old...

    You can scavenge key parts from some of the old TI-99/4 home computers, and possibly other keyboards from that time frame. The key caps can be removed by pulling them straight out. The thin walled...
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    At the National Center for Atmospheric Research...

    At the National Center for Atmospheric Research (NCAR), we used HiPPI for the high speed Mainframe and Server Network (MASnet) network between the supercomputers, front end server and the Mass...
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    SGI systems had a port of Doom for them, we used...

    SGI systems had a port of Doom for them, we used to play on our Indigos and Indys. That was great fun. Once during a death match I managed to kill another player's character at a respawn location,...
  24. It seems that it is nearly impossible to find any...

    It seems that it is nearly impossible to find any sort of errata for Zilog chips. I tried for quite a while to find Z180 errata, and failed, but just had to assume that some behavior that another...
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    Find that ASCII Star Wars movie?

    Find that ASCII Star Wars movie?
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