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Author Topic: Televideo Space Invader Board, Teensy  (Read 2876 times)

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Offline OldIsNew

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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
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Offline _haru

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Re: Televideo Space Invader Board, Teensy
« Reply #1 on: Thu, 17 August 2017, 00:02:40 »
That is one HELL of a long spacebar.
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Offline fohat.digs

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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.
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Offline OldIsNew

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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


 

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Offline fohat.digs

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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.
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“Citizens United violates the essence of what made America a great country in its political system. Now it’s just an oligarchy, with unlimited political bribery being the essence of getting the nominations for president or to elect the president.
So now we’ve just seen a complete subversion of our political system as a payoff to major contributors, who want and expect and sometimes get favors for themselves after the election’s over.”
- Jimmy Carter 2015

Offline Touch_It

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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.
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Offline OldIsNew

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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.
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Offline 0100010

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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.

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