Re: Vacuum Tube Calculator Schematic

On Jan 3, 5:14 pm, linnix <m...@xxxxxxxxxxxxxxxxxx> wrote:
On Jan 3, 2:09 pm, John Larkin



<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Sat, 3 Jan 2009 12:15:29 -0800 (PST), gabjs...@xxxxxxxxx wrote:
Does anyone know where I can find out how to design a calculator with
vacuum tubes, or where I can find an already-made schematic? It's for
a science fair.

The HP9100 programmable calculator used about 20 SIP-potted
discrete-transistor flipflops in its core and a lot of ROM of various
types. Program and data storage was magnetic cores, and the display
was 7-segment, vector characters on a CRT.

I should think that a "microcoded" (simple state machine with big
diode ROM) calculator could be done with about 20 or 30 dual triodes
and some sort of storage mechanism, capacitors maybe. But it would be
a heap of work.

John

If someone has the money and time to do it, a better show case is to
build with transistor/led unit.  A blue/red led should show the state
of the corresponding transistor state.  It would be interesting to
look at.

schematics, please. and if neccesary, I have nixie tubes, however,
they would require a demux and only 3 bits (they aren't hex and I
ain't doin' BCD or converting to decimal).

Look, if someone can simply either tell me or give me a web page with
the schematics for:
a.) a half adder
b.) a full adder
and possibly c.) 1/2 of a 7474 equivalent (D-type flip-flop with
preset and clear)

I can do bare transistor logic. I just need to be able to do it with
tubes. A book on BN or Amazon would be fine. FYI, I THINK a 12Ax7
(where x is T, U, V, X or Y) makes a 2-input AND, OR, NAND or NOR gate.
.

Relevant Pages

  • Re: Vacuum Tube Calculator Schematic
    ... vacuum tubes, or where I can find an already-made schematic? ... discrete-transistor flipflops in its core and a lot of ROM of various ... schematics, please. ... I can do bare transistor logic. ...
    (sci.electronics.design)
  • Re: Vacuum Tube Calculator Schematic
    ... vacuum tubes, or where I can find an already-made schematic? ... discrete-transistor flipflops in its core and a lot of ROM of various ... the schematics for: ...
    (sci.electronics.design)
  • Re: Vacuum Tube Calculator Schematic
    ... vacuum tubes, or where I can find an already-made schematic? ... discrete-transistor flipflops in its core and a lot of ROM of various ... the schematics for: ...
    (sci.electronics.design)
  • Re: Vacuum Tube Calculator Schematic
    ... vacuum tubes, or where I can find an already-made schematic? ... discrete-transistor flipflops in its core and a lot of ROM of various ... the schematics for: ...
    (sci.electronics.design)
  • Re: Vacuum Tube Calculator Schematic
    ... vacuum tubes, or where I can find an already-made schematic? ... discrete-transistor flipflops in its core and a lot of ROM of various ... schematics, please. ... a half adder ...
    (sci.electronics.design)