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Willard Goosey
Works at Subway
Attended New Mexico Tech
Lives in Socorro New Mexico
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Willard Goosey

Discussion  - 
 
Upgrade on terminal.
 
thanks to arcadechips.com my poor old Televideo TVI912C terminal now has the optional second page of text memory.

The upgrade is 4 1Kx4bit 2114-1 SRAMs. I was really worried that I would need to install jumpers or something, and I don't have the repair/upgrade docs. But it works fine. I installed the chips and it wss good to go!

I did think it was interesting that the notoriously slow TVI912 needs fairly fast (150ns) RAM. 
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Are there any secret codes? Escape Meta Alt Control Shift to write to page 1 while displaying page 0? Set jumper Wπ to enable color? :-)
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Willard Goosey

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Genius!
I've been around sewing machines my whole life and I've never understood their magic... Until now!
 
Just in case you were wondering how a sewing machine worked
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Willard Goosey

Home Computers  - 
 
Teletek Atari joystick adapter final version and installation. On a machine with a notoriously slow, monochrome, text only terminal (Televideo 912). Yeah that's a natural game machine....
 
Atari joystick adapter for Teletek SysteMaster final version and installed. I stole the needed +5 volts from the LED driver board which also provides ground to pull down the unused data lines.

It was bad enough that I only know of one other running Teletek but this? Now I have a totally unique combination of hardware to write software for. Software nobody else in the entire universe can use.
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Something like that I guess? I'm pretty bad at arcade games so I'm not sure.
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Atari joystick adapter prototype wired to Teletek SysteMaster Z80-PIO Port B. The lone wire to Port A is for power. Turns out the 200in1's batteries weren't up to driving the PIO lines high through 1K resistors. Before I make a real cable I need to find a better place to steal +5V from.




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Willard Goosey

Home Computers  - 
 
The chain of events that led to this: (no pun intended)
1) Oh ick! OUTP() isn't interrupt-safe! (C/80 v 3.1 CP/M 2.2) That would be why my program crashes on the Teletek SysteMaster, which is completely interrupt -driven. :(

2)Patch patch patch. Ok that's done.

3) test test test good LEDCLK no longer crashes.

4)Oh look INP() is the same way. Patch patch patch.

5) Testing? Uh, an input port I can read without screwing something else up? How about that unused PIO port?!?

6) Read z80pio.pdf. Ok nice chip...

7) Poke at PIO with zsid. Control mode set. All lines input. Read back all zeros. There must be pull-downs.

8) Different results from INP() . Oops where does C/80 put its return value? Oh yeah. HL. Fix fix fix.

9) Success! But a screen full of zeros is boring. What could I easily wire up to that PIO? Humm Atari joysticks are simple!

10) Prototype time!

TBD) prototype works but those pull-downs on the PIO mean I gotta steal +5V from somewhere else because the port B connector doesn't have it. For testing I can just use the 200in1's batteries but not for a permanent install.
 
Atari joystick..... decoded
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I got the 200in1 a couple of years ago at a thrift store. I had the older 130in1 when I was a kid.
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Watched some Kraftwerk videos on YouTube. They are far more hardcore that I ever gave them credit for!

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Willard Goosey

Shared publicly  - 
 
thanks to arcadechips.com my poor old Televideo TVI912C terminal now has the optional second page of text memory.

The upgrade is 4 1Kx4bit 2114-1 SRAMs. I was really worried that I would need to install jumpers or something, and I don't have the repair/upgrade docs. But it works fine. I installed the chips and it wss good to go!

I did think it was interesting that the notoriously slow TVI912 needs fairly fast (150ns) RAM. 
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Willard Goosey

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I'm not into 6502 at the moment but this looks pretty nice...
 
An interesting description and some history of the 6502 macro assembler developed at Lucasfilm in the '80s (now open source).
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Atari joystick adapter for Teletek SysteMaster final version and installed. I stole the needed +5 volts from the LED driver board which also provides ground to pull down the unused data lines.

It was bad enough that I only know of one other running Teletek but this? Now I have a totally unique combination of hardware to write software for. Software nobody else in the entire universe can use.
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Willard Goosey

Home Computers  - 
 
Teletek SysteMaster with prototype Atari joystick adapter.
 
Atari joystick adapter prototype wired to Teletek SysteMaster Z80-PIO Port B. The lone wire to Port A is for power. Turns out the 200in1's batteries weren't up to driving the PIO lines high through 1K resistors. Before I make a real cable I need to find a better place to steal +5V from.




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+Peter Walker​ the chassis has slots for 8x db25's in the back. I'm a little undecided about actually making the cable, do I really want another machine-specific thing to write code for? As for the Lab, that is MINE :-)
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Atari joystick..... decoded
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More on the history of the 68000 machines....
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Education
  • New Mexico Tech
    Computer Science, 1992 - 2001
  • Raton High
    high school, 1988 - 1992
Basic Information
Gender
Male
Other names
Willard Frank Goosey III
Apps with Google+ Sign-in
  • Solitaire Classic
Story
Introduction
Raton High UberGeek, New Mexico Tech CS nut, collector of old computers, programmer, writer, linux+CoCo+CPM+m100 nut, shadetree mechanic

Bragging rights
Official maintainer of the OS-9/6x09 C preprocessor, creator of ROG, the TRS-80 Model 100 roguelike game.
Work
Occupation
Subway Sandwich artist
Employment
  • Subway
    2012 - present
  • McDonalds
    2001 - 2008
  • Subway
    1999 - 2001
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Socorro New Mexico
Previously
Raton New Mexico - Aguilar Colorado
One of my favorite restaurants in Socorro! After 20 years of eating there I've never had bad food or bad service! Highly recommended!
Food: ExcellentDecor: Very GoodService: Excellent
Public - 3 years ago
reviewed 3 years ago
This has been one of my favorite places to eat for nearly 20 years! This is basically where I learned to love New Mexican food.
Food: ExcellentDecor: ExcellentService: Very Good
Public - 3 years ago
reviewed 3 years ago
2 reviews
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