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Thread: "Technical Solutions" EPROM emulator asisstance? :-)

  1. #1
    Join Date
    Nov 2016
    Location
    Muskego, Wisconsin
    Posts
    30

    Default "Technical Solutions" EPROM emulator asisstance? :-)

    Hello,
    In my continuing quest to bring my 1980's computer equipment back to life, I'd like to
    employ my "Technical Solutions" EPROM emulator.
    I really liked how simply it worked .. You'd plug the emulator into your EPROM socket
    of your target board, and run a RJ-11 cable from the emulator to an adapter that plugged
    into an unused printer port.
    The software utility let you chose what file and type to upload, and away you'd go

    I still have the emulator, software and manual. What I do NOT have is the
    interconnecting cable and printer port to RJ-11 cable adapter.

    I have some "shells" that have a DB-25 and RJ-11 cable connector, but I've no clue as to
    how to wire it

    Can anyone help? Perhaps a wiring schematic for the adapter? Or an "old" Technical
    Solutions emulator or parts they'd care to sell?

    Copious thanks!

  2. #2
    Join Date
    Mar 2013
    Location
    Chaffee, MO
    Posts
    1,668

    Default

    Sounds like an interesting project.

    The IBM PC Parallel port is described at this URL: https://pinouts.ru/ParallelPorts/Par...C_pinout.shtml

    Code:
    Pin 	Name 	Dir 	Description
    1 	/STROBE 	--> 	Strobe
    2 	D0 	--> 	Data Bit 0
    3 	D1 	--> 	Data Bit 1
    4 	D2 	--> 	Data Bit 2
    5 	D3 	--> 	Data Bit 3
    6 	D4 	--> 	Data Bit 4
    7 	D5 	--> 	Data Bit 5
    8 	D6 	--> 	Data Bit 6
    9 	D7 	--> 	Data Bit 7
    10 	/ACK 	<-- 	Acknowledge
    11 	BUSY 	<-- 	Busy
    12 	PE 	<-- 	Paper End
    13 	SEL 	<-- 	Select
    14 	/AUTOFD 	--> 	Autofeed
    15 	/ERROR 	<-- 	Error
    16 	/INIT 	--> 	Initialize
    17 	/SELIN 	--> 	Select In
    Using Pins (2..9) = D{0..7} it shouldn't be hard to get the 8 bits sent over the RJ-11's 8 wires
    to D{0..7} in the EPROM Emulator. D{0..7} should be wired to the RJ-11 Port on
    the EPROM Emulator from it's internal RAM.

    Once you have that figured out you could make a PCB (if needed) or just wire
    the Parallel Cable accordingly.


    Larry

  3. #3

    Default

    Sure it wasn't the serial/com port ?

    I tried searching for "Technical Solutions EPROM emulator" but the terms are too common...
    (just as when I tried to find info on my Data Display LED sign.....)

    Maybe a picture of the emulator board can help ?

  4. #4
    Join Date
    May 2011
    Location
    Outer Mongolia
    Posts
    3,252

    Default

    Quote Originally Posted by gertk View Post
    Sure it wasn't the serial/com port ?
    I second that, given the fact that an "RJ-11" plug has a maximum of six contact wires. (Technically it's called "RJ-11,14, or 25 depending on how many pairs are used.) It's still possible it bitbangs over the parallel port but the communication would pretty much have to be serial.
    My Retro-computing YouTube Channel (updates... eventually?): Paleozoic PCs

  5. #5
    Join Date
    Mar 2013
    Location
    Chaffee, MO
    Posts
    1,668

    Default

    I bet it is a RJ-45 connector and what you need is something like this:
    https://www.cableleader.com/adapters...5-to-rj45.html

    That would be the best way to go. You can make any length CAT6 cable with Stranded or Solid
    conductors by crimping on the ends.

    Larry

  6. #6
    Join Date
    Nov 2016
    Location
    Muskego, Wisconsin
    Posts
    30

    Default

    I have some photographs of the emulator but I'm having trouble posting them here
    Is a 100K jpg OK to post?

  7. #7
    Join Date
    Jan 2007
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    Pacific Northwest, USA
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    Default

    Probably not, I think 80K is the limit (unless it's been changed). Use an off-site hosting service like Imgur.com and link to the images in your post. You then can go as huge as you want.

  8. #8
    Join Date
    Nov 2016
    Location
    Muskego, Wisconsin
    Posts
    30

    Default

    Let's see if this works ..

    [IMG]www.bignick.net/emulator1.jpg[/IMG]

  9. #9
    Join Date
    Jan 2007
    Location
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    Default

    Get a 404 on your image url.

  10. #10
    Join Date
    Mar 2016
    Location
    Georgia, USA
    Posts
    685

    Default

    The manual defonitely says it was a parallel port connection.

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