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Re: In the beginning

I'll second that, and add that experimenting with the Replica I led me to all sorts of fun diversions, like designing printed circuit boards and assembly language programming. Thanks, Vince! :)
by devo
Mar Mon 24, 2008 10:21 am
 
Forum: Venues, projects and off topic stuff - NO SPAM
Topic: In the beginning
Replies: 2
Views: 5815

Ok, I couldn't resist ordering one of these to play with. Imagine my surprise when it worked the first time. I made a green ocean for my octopus to swim in: http://www.flatwatersoftware.com/images/ezvga.jpg Sorry for the crappy picture quality. A breadboard with an ATMEGA8515 is in the foreground, w...
by devo
May Tue 08, 2007 8:54 pm
 
Forum: Creation Room
Topic: Nice idea for VGA
Replies: 5
Views: 10953

You've probably already found them, but there are also these bitmaps:

http://www.sbprojects.com/projects/apple1/terminal.htm
by devo
May Sun 06, 2007 7:11 am
 
Forum: Software
Topic: Apple 1 font
Replies: 7
Views: 12423

Digikey sells an 84-pin soldertail PLCC socket: ED90024-ND
If you decide to go for it, be sure to post the results! :)
by devo
Apr Thu 19, 2007 7:08 am
 
Forum: Creation Room
Topic: Nice idea for VGA
Replies: 5
Views: 10953

I saw an ad for that chip in Circuit Cellar this month. It looks like it would be a good way to add video to a homemade 8-bit computer.
by devo
Apr Sat 14, 2007 11:24 am
 
Forum: Creation Room
Topic: Nice idea for VGA
Replies: 5
Views: 10953

Aha...thanks for the explanation, Vince. I was hoping it was something like that, and not a keyboard malfunction! On an unrelated note, I've really gotten to appreciate the capabilities of the ATMEGA8515...is there anything it can't do? Seems like you could make an 8-bit computer using one as a PIA,...
by devo
Mar Wed 07, 2007 8:27 pm
 
Forum: Creation Room
Topic: Homemade ASCII Keyboard
Replies: 10
Views: 41662

One interesting phenomenon I've noticed - if I forget to put caps lock on and type lowercase letters to the Replica I SE, the letters show up on the screen as uppercase, but they are ignored by the monitor. It's interesting that they get displayed as upper case but not parsed as upper case.
by devo
Mar Wed 07, 2007 10:11 am
 
Forum: Creation Room
Topic: Homemade ASCII Keyboard
Replies: 10
Views: 41662

Parts list: 1 x ATMEGA8515 (Digikey: ATMEGA8515-16PU-ND) 1 x 40 pin DIP socket (Digikey: ED3740-ND) 1 x 16 pin DIP socket (Digikey: ED3116-ND) 1 x 8 MHz crystal (Digikey: 631-1099-ND) 2 x 15 pF caps (Digikey: 1427PH-ND) 59 x keyswitches (Digikey: CH160-ND) 59 x keycaps (Digikey: CH696-ND) 51 x clear...
by devo
Mar Wed 07, 2007 9:52 am
 
Forum: Creation Room
Topic: Homemade ASCII Keyboard
Replies: 10
Views: 41662

Schematic: http://www.flatwatersoftware.com/images/keyboardschematic.jpg The actual schematic file is here (requires ExpressPCB software). PCB layout: http://www.flatwatersoftware.com/images/keyboardpcb.jpg PCB layout file is here (requires ExpressPCB software).
by devo
Mar Wed 07, 2007 9:26 am
 
Forum: Creation Room
Topic: Homemade ASCII Keyboard
Replies: 10
Views: 41662

Here's the microcontroller code. Sorry about the uneven spacing, phpBB seems to do strange things with tabs. The clock fuses on the 8515 are set for a high-frequency external crystal and long start-up time (CKSEL=1111,SUT=11). ; Summary: ASCII keyboard interface ; Target hardware: ATMEGA8515 ; Autho...
by devo
Mar Wed 07, 2007 9:18 am
 
Forum: Creation Room
Topic: Homemade ASCII Keyboard
Replies: 10
Views: 41662

Description: - 52 regular keys - 4 special keys (ctl, reset, shift, caps lock) - key autorepeat - LED power and caps lock indicators - ctl + reset sends a reset to the keyboard controller and the keyboard connector When the snow melts and I can get to my table saw, maybe I'll see about making a prop...
by devo
Mar Wed 07, 2007 9:14 am
 
Forum: Creation Room
Topic: Homemade ASCII Keyboard
Replies: 10
Views: 41662

Homemade ASCII Keyboard

http://www.flatwatersoftware.com/images/asciikeyboard.jpg The bare (almost) PCB: http://www.flatwatersoftware.com/images/keyboardbarepcb.jpg Programming the Replica I SE in BASIC: http://www.flatwatersoftware.com/images/keyboardscreen.jpg
by devo
Mar Wed 07, 2007 9:09 am
 
Forum: Creation Room
Topic: Homemade ASCII Keyboard
Replies: 10
Views: 41662

Including the (commented!) source code is so great. Thanks - it's really helpful!
by devo
Mar Sun 04, 2007 6:40 am
 
Forum: Software
Topic: Krusader update
Replies: 6
Views: 9513

I wanted to have autorepeat as part of the full-size keyboard I've been working on, so I figured I'd try adding it to the keypad first. It works, and I edited the microcontroller code above to show the changes. I'm not the best assembly programmer, but it's functional. I decided on the repeat delay ...
by devo
Feb Sat 24, 2007 7:08 pm
 
Forum: Creation Room
Topic: ASCII Hex Keypad
Replies: 9
Views: 18995

Changing the color of those keys is a good thought. The computed board cost for the full size keyboard is $142 for two. The keys cost about $2 each if you get the clear tops too, or about $1.15 each if you don't. Throw in about $10-$15 for the rest of the components and it looks like a homebrew ASCI...
by devo
Feb Fri 16, 2007 3:27 pm
 
Forum: Creation Room
Topic: ASCII Hex Keypad
Replies: 9
Views: 18995
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