Image Map Image Map
Tab Content
  • ldkraemer's Avatar
    Today, 04:08 AM
    David, Thanks for the reply, and the clarification on how the Refresh Timer affects the NOP Tester. I've never run across that before, and...
    17 replies | 515 view(s)
  • ldkraemer's Avatar
    Yesterday, 01:08 PM
    Woody, If you have the O'Scope set for x10 Probe, and the Trigger set for say Channel 1 as DC Input, and the Slope set for Leading or Trailing Edge,...
    17 replies | 515 view(s)
  • ldkraemer's Avatar
    July 19th, 2018, 11:32 AM
    Woody, Are you testing with an O'Scope or Freq Counter? Is the Shunt Z3 inserted into the Motherboard? You should be seeing a good square wave...
    17 replies | 515 view(s)
  • ldkraemer's Avatar
    July 19th, 2018, 03:28 AM
    Phed, You will likely run across: .*Y* - - lzh crunched file .*Q* - - squeezed file .*Z* - - crunched file There are three utilities that will...
    2 replies | 95 view(s)
  • ldkraemer's Avatar
    July 19th, 2018, 03:07 AM
    Woody, Why don't you make an Address Line tester first. Take a known good Z80 CPU and slightly bend the D{0..7} pins out so they don't go into the...
    17 replies | 515 view(s)
  • ldkraemer's Avatar
    July 18th, 2018, 05:18 PM
    Woody, The first two Characters are: @ = 0x40 = 0100 0000 = CORRECT B = 0x42 = 0100 0010 = Not Correct needs to be 9 = 0x39 = 0011 1001 ...
    17 replies | 515 view(s)
  • ldkraemer's Avatar
    July 17th, 2018, 12:36 PM
    The first thing I'd do is pull the Z3 Shunt (Jumper): The address lines are outputs from the Z-80 used to specify memory locations. If any address...
    17 replies | 515 view(s)
  • ldkraemer's Avatar
    July 16th, 2018, 02:18 PM
    Woody, The initial Schematic in the 1978 Manual had that error. The later version (1982) had the correct parts. Q1 = MPS3904 Q2 = MPS3906 ...
    17 replies | 515 view(s)
  • ldkraemer's Avatar
    June 30th, 2018, 04:49 AM
    ldkraemer replied to a thread Lobo MAX-80 in CP/M and MP/M
    Alphasite, There is a lobom80.zip on Dave Dunfield's site. These Def's will access the .RAW images created with the Imagedisk Utilities (IMDA,...
    4 replies | 151 view(s)
  • ldkraemer's Avatar
    June 28th, 2018, 03:26 AM
    ldkraemer replied to a thread Osborne 1 Repair in CP/M and MP/M
    David, I noticed that there is no Silkscreen for Pin 1 marked outside the boxed header too. It's easy to see the square pad in the photo, but...
    20 replies | 1172 view(s)
  • ldkraemer's Avatar
    June 27th, 2018, 03:06 PM
    David, I thought I also replied and asked to have my name added to the list. I can't locate that posting. Please add me to the list. Larry
    64 replies | 4330 view(s)
  • ldkraemer's Avatar
    June 27th, 2018, 03:53 AM
    ldkraemer replied to a thread Osborne 1 Repair in CP/M and MP/M
    David, I'd also like one of your shield boards for the Mega 2560. Larry
    20 replies | 1172 view(s)
  • ldkraemer's Avatar
    June 22nd, 2018, 03:02 AM
    I inserted the Bits from both the Kaypro II 81-146 (same as the 81-146a from Maslin Archive) Character ROM and the PRO8 GREEK ROM to the standard...
    7 replies | 403 view(s)
No More Results
About ldkraemer

Basic Information

About ldkraemer
Biography:
Electronic Technician
Location:
Chaffee, MO
Interests:
Computers, Hardware, Troubleshooting
Occupation:
Retired

Statistics


Total Posts
Total Posts
828
Posts Per Day
0.42
General Information
Last Activity
Today 04:08 AM
Join Date
March 13th, 2013
Referrals
0

4 Friends

  1. andykmv andykmv is offline

    Junior Member

    andykmv
  2. CalculatorLab CalculatorLab is offline

    Member

    CalculatorLab
  3. cappy2112 cappy2112 is offline

    Junior Member

    cappy2112
  4. clh333 clh333 is offline

    Senior Member

    clh333
Showing Friends 1 to 4 of 4