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Author Topic: Televideo Space Invader Board, Teensy  (Read 4248 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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“So, instead, all too many people try an untenable middle way -- sanctifying Trump and anyone in his inner circle while trying to maintain standards on everyone else. It simply can't work. When your leaders are hateful and nihilistic then your movement becomes hateful and nihilistic. ”
~ David French

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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