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  • cbscpe's Avatar
    Yesterday, 07:13 PM
    cbscpe replied to a thread KDJ11-A in H9275-A in DEC
    The KDJ11A has 250Ohm termination and the H9275 has 120Ohm termination, thoug it is not the best combination it should not be a problem. As always...
    2 replies | 54 view(s)
  • cbscpe's Avatar
    Yesterday, 01:04 AM
    cbscpe replied to a thread SMS 11X PDP-23 rescue in DEC
    Hi Jerry, Thanks for the links and for confirming. In other words my next project will be a RH70 emulator. I will try if I can emulate a RM05 on...
    11 replies | 446 view(s)
  • cbscpe's Avatar
    Yesterday, 12:47 AM
    cbscpe replied to a thread DC319 in VHDL - any interest? in DEC
    Im using a Atmega1284P, it has a large Flash (128k) and a very large SRAM (16k, the largest among all AVR). The RLV12 core itself only needs little...
    13 replies | 419 view(s)
  • cbscpe's Avatar
    June 16th, 2018, 11:03 AM
    cbscpe replied to a thread DC319 in VHDL - any interest? in DEC
    this was the remark which I referred to as your concern. Not sure what you meant by this. Here a small teaser of my current work :p. In fact...
    13 replies | 419 view(s)
  • cbscpe's Avatar
    June 16th, 2018, 07:35 AM
    cbscpe replied to a thread SMS 11X PDP-23 rescue in DEC
    So you say the SC02/033 emulated a RP02/3, RK06/07,... or RM02/03/05... on a Q-Bus and it was software compatible with the original DEC drivers? I...
    11 replies | 446 view(s)
  • cbscpe's Avatar
    June 16th, 2018, 05:50 AM
    cbscpe replied to a thread DC319 in VHDL - any interest? in DEC
    Hi Ken, I'm considering using the 128A1U, as it has 8 USARTs, to build a dual DLV-11J. But so far my designs are pure 5V designs and I use...
    13 replies | 419 view(s)
  • cbscpe's Avatar
    June 15th, 2018, 12:36 PM
    Bidirectional buffers are in fact only helpful for BDAL0..15. However a level converter with dedicated OE for each side instead of DIR and OE would...
    19 replies | 557 view(s)
  • cbscpe's Avatar
    June 14th, 2018, 09:43 PM
    Yes there are a total of 44 signals on the Q-Bus, however many are special and will reduce the number of IOs. There are some signals we normally do...
    19 replies | 557 view(s)
  • cbscpe's Avatar
    June 14th, 2018, 11:39 AM
    Hi, I think the first thing we need to solve is the level conversion. We need to pay attention to the fact that VIL is 1.1V and VIH is 2.25V. This...
    19 replies | 557 view(s)
  • cbscpe's Avatar
    June 14th, 2018, 08:46 AM
    cbscpe replied to a thread SMS 11X PDP-23 rescue in DEC
    Ah but then you are limited to 16-bit isn't it? The RKV11-D did only support 16-bit addresses. Peter
    11 replies | 446 view(s)
  • cbscpe's Avatar
    June 12th, 2018, 11:01 AM
    cbscpe replied to a thread PDP-11 Hack complete in DEC
    I will, once I find the time to start my own home-page.
    12 replies | 1003 view(s)
  • cbscpe's Avatar
    June 9th, 2018, 11:51 PM
    cbscpe replied to a thread DC319 in VHDL - any interest? in DEC
    Hi Ken, Yeah TI has tons of level converters. Do you have already one in mind to interface 3V3 to QBUS? I was also thinking of using Level...
    13 replies | 419 view(s)
  • cbscpe's Avatar
    June 9th, 2018, 12:44 PM
    cbscpe replied to a thread DC319 in VHDL - any interest? in DEC
    Hi Ken, if you want to interface to legacy logic you need to have 5V compatibility. So FPGA's are ruled out, there aren't any in the meantime. I...
    13 replies | 419 view(s)
  • cbscpe's Avatar
    June 9th, 2018, 07:19 AM
    cbscpe replied to a thread KICAD QBUS PCB Template in DEC
    Isn‘t there an import in the newest Kicad for eagle files?
    4 replies | 227 view(s)
  • cbscpe's Avatar
    June 7th, 2018, 11:16 PM
    cbscpe replied to a thread DC319 in VHDL - any interest? in DEC
    Hi Ken, when I was building my DCJ11 based PDP-11 I had the same requirement for DLV11 compatible serial ports. However I took a completely...
    13 replies | 419 view(s)
  • cbscpe's Avatar
    June 5th, 2018, 03:01 AM
    cbscpe replied to a thread Need help with 11/23 system in DEC
    Just to make sure, you only have one additional terminator. In other words not both, the terminators in the H9278 backplane and the BDV11 at the same...
    11 replies | 430 view(s)
  • cbscpe's Avatar
    June 4th, 2018, 11:58 AM
    cbscpe replied to a thread Need help with 11/23 system in DEC
    So at least it seems not to be cause by the experiments with the RX33. It would have surprised me that this could cause any damage. It's all open...
    11 replies | 430 view(s)
  • cbscpe's Avatar
    June 3rd, 2018, 12:17 PM
    cbscpe replied to a thread Need help with 11/23 system in DEC
    Try without RQDX. Peter
    11 replies | 430 view(s)
  • cbscpe's Avatar
    May 26th, 2018, 12:41 PM
    cbscpe replied to a thread PDP-11 Hack complete in DEC
    Thanks, I plan to publish the project, also I'm willing to give away some of the prototype boards. With dirtypcbs you always get 10 but in fact I...
    12 replies | 1003 view(s)
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