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by J. Calhoun
Mar Wed 12, 2008 1:15 am
 
Forum: Creation Room
Topic: Apple IIe keyboard and super encoder
Replies: 2
Views: 5445

Is this something you're planning to sell to others who don't have the time to assemble? No. It hadn't occurred to me. Do you have an Apple IIe keyboard (that being, to my mind, the largest hurdle)? BTW, Jayhawk here too. That is strange.... What's with all these midwesterners? An aside you might a...
by J. Calhoun
Apr Thu 05, 2007 1:17 am
 
Forum: Creation Room
Topic: Apple IIe Keyboard Interface
Replies: 10
Views: 16444

How about printing the Return and Shift key text on colored paper so they stand out from the rest of the matrix?

You're QWERTY-style layout is nice. I suspect someone might be willing to go in for half of another $100 keyboard if you decided to do it....
by J. Calhoun
Feb Fri 16, 2007 12:58 pm
 
Forum: Creation Room
Topic: ASCII Hex Keypad
Replies: 9
Views: 14144

Wow, that is amazing. Really excellent. It never occurred to me to make a whole functioning keyboard — and to use the shift key as a way of getting all the characters you need in a small footprint. And having the HEX characters unshifted is slick. Are you happy with the keys/switches? Which part # f...
by J. Calhoun
Feb Thu 15, 2007 4:10 pm
 
Forum: Creation Room
Topic: ASCII Hex Keypad
Replies: 9
Views: 14144

I was able to bring the power switch external because I used an internal switching power supply to supply power to the Replica I (elsewhere on this forum I describe this). The switch I came up with is a standard 110V AC rated switch variety. So, in short, the Replica I is always on , it is the power...
by J. Calhoun
Feb Thu 15, 2007 12:48 pm
 
Forum: Creation Room
Topic: External Reset and Clear buttons?!
Replies: 2
Views: 4629

Omaha is awesome. My wife grew up there — I grew up in Kansas City and met her at K.U. Anyway.... The rainbow cable is flat ribbon cable from Jameco. On the ends are I think what Jameco call IDC DIP Flat Cable Plugs. I'd give you a URL but Jameco's page isn't coming up for me right now. The part num...
by J. Calhoun
Feb Fri 02, 2007 2:23 am
 
Forum: Creation Room
Topic: Apple IIe Keyboard Interface
Replies: 10
Views: 16444

So, the keys from the keyboard just happen to fit the switches? That's nice. My advice is to clip off the stabilizing pins and just epoxy/Gorilla-glue the switches to the perfboard. Then maybe even solder them to a sort of wire-wrap header or IC Socket so you can use the keypad in future projects/ex...
by J. Calhoun
Jan Tue 30, 2007 11:33 am
 
Forum: Creation Room
Topic: ASCII keyboard
Replies: 5
Views: 7469

Excellent — I recognize most of the hardware (including STK500 trying to sneak out of the frame to the right) — and I have almost the same breadboard! (I guess I don't often use wire nuts in my electronics projects though.) The key pad is a mystery to me though. The buttons are from a keyboard I tak...
by J. Calhoun
Jan Mon 29, 2007 3:25 am
 
Forum: Creation Room
Topic: ASCII keyboard
Replies: 5
Views: 7469

http://homepage.mac.com/calhoun/.Pictures/Unsorted/Replica04.jpg (As usual, if the photo disappears, it is due to my site bandwidth — it should return in a few days.) Here is the complete front panel with lettering. I apologize to Vince if he feels slighted in any way: I went back and forth on whet...
by J. Calhoun
Jan Wed 24, 2007 2:48 pm
 
Forum: replica 1 General Discussion
Topic: Photos of your Replica I
Replies: 9
Views: 11951

I've been thinking about an implementation of this board using TIL311 chips instead of the LED's. They're not cheap ($16 each from Jameco) but they look great and each one displays a single Hex digit. Imagine the adress in legible Hex (four TIL311's required) and the data as well (2 more TIL311's). ...
by J. Calhoun
Jan Tue 23, 2007 12:02 pm
 
Forum: Creation Room
Topic: Debug board
Replies: 18
Views: 22321

Conclusion. It works. I need to time the strobe to see if I'm really doing 40 mS. I may even try to back it down a bit so I don't miss a keystroke. But all that is in software. The board I am very satisfied with. I think I messed up the square pad on the LED, so if you make this board, just be sure ...
by J. Calhoun
Jan Fri 19, 2007 2:32 pm
 
Forum: Creation Room
Topic: Apple IIe Keyboard Interface
Replies: 10
Views: 16444

In my experience, the boards from ExpressPCB come back in about 4 days. Not bad. And here is the bare board (top-side): (If images disappear, my site may be down temporarily due to bandwidth issues.) http://homepage.mac.com/calhoun/.Pictures/Unsorted/BarePCB.jpg Here is the board with components in ...
by J. Calhoun
Jan Fri 19, 2007 2:21 am
 
Forum: Creation Room
Topic: Apple IIe Keyboard Interface
Replies: 10
Views: 16444

Can you write to the CFFA1 from the Replica I?

That is can I start writing code, create a new file on the CFFA1 and save to it? I would like to be able to shut down and start back in on a saved project at a later date.
by J. Calhoun
Jan Sat 13, 2007 4:23 am
 
Forum: replica 1 General Discussion
Topic: CFFA1 video shows fast loading of programs
Replies: 4
Views: 6876

That's awesome. I may yet be motivated to do the speech synthesis board for the Apple I....
by J. Calhoun
Jan Sat 13, 2007 4:20 am
 
Forum: Software
Topic: Eliza fix
Replies: 5
Views: 6154

I figure for only 3-4 times the cost of the nice, professional Apple keyboard I can create a less functional, ugly homebrew one! Excellent attitude! I'm several hundred dollars into just an interface at this point and I'm having a blast. It wasn't costing enough though so I'm laying out the PCB a s...
by J. Calhoun
Jan Sat 13, 2007 4:10 am
 
Forum: replica 1 General Discussion
Topic: ASCII Keyboard
Replies: 6
Views: 8659
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