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  • smp's Avatar
    February 17th, 2018, 09:59 AM
    smp replied to a thread 8080 TTL Project in Other
    Hi Marty, and welcome back! Your project sounds like it is appropriate for VHDL or FPGA design. I thought someone else here was helping you learn...
    10 replies | 176 view(s)
  • smp's Avatar
    February 13th, 2018, 05:33 AM
    The stock Altair CPU board had a marginal clock circuit. I suggest that you take a close look at the 2-phase clock signals. Remember they must be...
    16 replies | 574 view(s)
  • smp's Avatar
    February 11th, 2018, 05:36 AM
    smp replied to a thread HP 110 Portable in Handhelds/Portables
    Save yourself a bit of trouble and purchase this: ...
    13 replies | 350 view(s)
  • smp's Avatar
    February 10th, 2018, 11:05 AM
    I have the Statistics and the Finance modules, but no documentation to go along with them. The Finance module has a keyboard overlay - I do have...
    1 replies | 140 view(s)
  • smp's Avatar
    February 6th, 2018, 04:59 PM
    You made me doubt myself (see my earlier post) so I got out my 74 and tried them. Nope, not available. Just to be certain, I scoured the...
    13 replies | 406 view(s)
  • smp's Avatar
    February 4th, 2018, 12:26 PM
    smp replied to a thread Another PDP-8L on eBay in DEC
    It must have been taken down - I don't get the auction when I click the link. I did find this one, in rough shape, but offered for nearly $10K: ...
    9 replies | 226 view(s)
  • smp's Avatar
    February 2nd, 2018, 09:47 AM
    There is an article out there that compares the TI-74 to the previous TI CC-40: In that article, the author...
    13 replies | 406 view(s)
  • smp's Avatar
    January 30th, 2018, 02:56 PM
    Wow. If you asked, I would gladly have taken $100 and saved you $75. Too bad. smp
    8 replies | 262 view(s)
  • smp's Avatar
    January 30th, 2018, 05:38 AM
    What Glitch said, BUT it looks exactly like the one I have (except I don't have it framed). 8-) I posted a pic of mine long ago in the Other...
    8 replies | 262 view(s)
  • smp's Avatar
    January 27th, 2018, 05:48 AM
    Just a brief tip: Google is your friend when trying to identify DEC circuit boards. This guide is also very handy: ...
    21 replies | 930 view(s)
  • smp's Avatar
    January 23rd, 2018, 05:37 AM
    smp replied to a thread DEC PDP-8/F available on eBay in DEC
    I use eBay a lot, mostly as a Buyer, sometimes as a Seller. I get those messages from eBay in the internal-to-eBay message system. I have to go...
    20 replies | 970 view(s)
  • smp's Avatar
    January 20th, 2018, 01:31 PM
    smp started a thread DEC PDP-8/F available on eBay in DEC
    This is not mine. ...
    20 replies | 970 view(s)
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About smp

Basic Information

Date of Birth
June 16
About smp
Graduated college with my BSEE in 1975. MSCS in 2002.

Retired in October 2016, and I'm loving every moment of it.

A note from my past history:
In November 1976, I opened the first computer store in NH: Microcomputers, Inc. We sold IMSAI, Polymorphic, and Northstar kits, and assembled cards and computers. We attempted to sell complete systems into local small businesses. My partner and I operated until the fall of 1978, when we went broke.

I have (currently working):
Altair 680, IMSAI 8080 with JAIR-8080 CPU replacement running CP/M v2.2, HP-86B with HP-82900A Auxiliary Processor (A.K.A. CP/M System) and HP-9121D floppy disk drive, HP-110+ with HP-9114 floppy disk drive, HP-200LX, HP-41CL, HP Jornada 820, Apple IIC+, Apple IIGS (ROM 3), Tandy 2800HD, CoCo 3 with SDC, CoCo3FPGA, Heathkit H8, Osborne 1, Osborne Executive, Kaypro 2, Macintosh 512KE, Macintosh PowerBook 170, Macintosh Graphite iBook 466MHz (M6411), DEC PDP-11/23;

and (currently non-working):
(another) Kaypro 2, Heath/Zenith Z-110, SPARCclassic, a small variety of Macintosh desktop units.
Bedford, NH, USA
Space Exploration, Astronomy, Vintage Computing, RV Camping
Retired, and loving it!


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Today 05:13 PM
Join Date
October 4th, 2011