« previous next »
Pages:  [1]     Go Down

Author Topic: Televideo Space Invader Board, Teensy  (Read 4976 times)

0 Members and 1 Guest are viewing this topic.

Offline OldIsNew

  • Thread Starter
  • Posts: 145
Televideo Space Invader Board, Teensy
« on: Wed, 16 August 2017, 23:11:02 »
I've been curious about the Hi-Tek 725 "Space Invader" switches and was able to pick up a Televideo ASCII 935  board (at least I think that's the model based on the back of the PCB) with white linear space invaders on the cheap. I  mapped out the matrix and wired up the Teensy and am now actually able to use it.

176055-0            176061-1            176057-2
 

They're pretty nice linear switches.  While it's certainly not the most attractive board I've ever seen, I overall kind of like it!

176059-3
Logged

Offline _haru

  • Formerly linuxfanatic
  • Posts: 390
  • Location: Perth, Western Australia
  • Back from the dead
Re: Televideo Space Invader Board, Teensy
« Reply #1 on: Thu, 17 August 2017, 00:02:40 »
That is one HELL of a long spacebar.
Logged
AMJ60 - 45g MX White | GH60 Rev. C - Ghost Gateron Blacks | DFK101 - Alps SKCM Cream | Filco Majestouch 2 TKL - 62g Vintage MX Ergo Clear

Offline fohat.digs

  • * Elevated Elder
  • Posts: 6564
  • Location: 35°55'N, 83°53'W
  • weird funny old guy
Re: Televideo Space Invader Board, Teensy
« Reply #2 on: Thu, 17 August 2017, 08:06:32 »
Does that have the RJ14 connection? Those have proven quite problematic in the past.
Logged
"We are on the precipice of signing an agreement to advance talks with Iran that preserves the good parts of former President Barack Obama’s Joint Comprehensive Plan of Action (JCPOA) while amplifying its flaws.
Mr. Obama came to an agreement that did not involve America’s most precious treasure, the lives and limbs of our soldiers.  The 1.7 billion dollars of frozen Iranian assets released by Obama pales in comparison to the 300 billion being floated as a rebuilding fund.
So far, speculation that Iran will be free in the future to continue its nuclear program is the opposite of Trump’s stated goal for the war and in direct opposition to what Mr. Obama negotiated."
- Bill Roberts 2026-06-17

Offline OldIsNew

  • Thread Starter
  • Posts: 145
Re: Televideo Space Invader Board, Teensy
« Reply #3 on: Thu, 17 August 2017, 08:41:25 »
Quote from: fohat.digs on Thu, 17 August 2017, 08:06:32
Does that have the RJ14 connection? Those have proven quite problematic in the past.

I didn't think to post a pic of the connector before. It is a RJ type connector:

176083-0          176085-1


 

Logged

Offline fohat.digs

  • * Elevated Elder
  • Posts: 6564
  • Location: 35°55'N, 83°53'W
  • weird funny old guy
Re: Televideo Space Invader Board, Teensy
« Reply #4 on: Thu, 17 August 2017, 08:50:13 »
I have been through several Televideos, the only one that I was able to get working was one where the pins were labeled on the controller and I could clearly see data, clock, power, ground, etc. The rest have proven to use wildly different protocol.
Logged
"We are on the precipice of signing an agreement to advance talks with Iran that preserves the good parts of former President Barack Obama’s Joint Comprehensive Plan of Action (JCPOA) while amplifying its flaws.
Mr. Obama came to an agreement that did not involve America’s most precious treasure, the lives and limbs of our soldiers.  The 1.7 billion dollars of frozen Iranian assets released by Obama pales in comparison to the 300 billion being floated as a rebuilding fund.
So far, speculation that Iran will be free in the future to continue its nuclear program is the opposite of Trump’s stated goal for the war and in direct opposition to what Mr. Obama negotiated."
- Bill Roberts 2026-06-17

Offline Touch_It

  • Posts: 714
Re: Televideo Space Invader Board, Teensy
« Reply #5 on: Thu, 17 August 2017, 09:03:00 »
Ahh the Medium Ass Enter.  When you cant decide if BAE or ANSI.
Logged


Visit the Typing Test and try!

Offline OldIsNew

  • Thread Starter
  • Posts: 145
Re: Televideo Space Invader Board, Teensy
« Reply #6 on: Thu, 17 August 2017, 09:25:13 »
Quote from: fohat.digs on Thu, 17 August 2017, 08:50:13
I have been through several Televideos, the only one that I was able to get working was one where the pins were labeled on the controller and I could clearly see data, clock, power, ground, etc. The rest have proven to use wildly different protocol.




I wasn't able to find out much about the board's protocol. I just went ahead and bypassed the whole issue by mapping out the matrix with a multimeter, desoldering the IC's and wiring the the appropriate matrix row/column IC pads to the Teensy. Maybe that approach is kind of "cheating" in a way but I wanted to use the board and hey it worked.
Logged

Offline 0100010

  • Posts: 1127
  • Location: DFW, TX, US
  • Not Sure
Re: Televideo Space Invader Board, Teensy
« Reply #7 on: Thu, 17 August 2017, 10:17:19 »
Quote from: OldIsNew on Thu, 17 August 2017, 09:25:13
Quote from: fohat.digs on Thu, 17 August 2017, 08:50:13
I have been through several Televideos, the only one that I was able to get working was one where the pins were labeled on the controller and I could clearly see data, clock, power, ground, etc. The rest have proven to use wildly different protocol.




I wasn't able to find out much about the board's protocol. I just went ahead and bypassed the whole issue by mapping out the matrix with a multimeter, desoldering the IC's and wiring the the appropriate matrix row/column IC pads to the Teensy. Maybe that approach is kind of "cheating" in a way but I wanted to use the board and hey it worked.

Logged
  Quoting me causes a posting error that you need to ignore.
Pages:  [1]     Go Up
« previous next »