here's the site:
http://www.geocities.com/ted_rossin/...#LogicAnalyzer
Schematic:
http://www.geocities.com/ted_rossin/...heapLogicA.jpg
parts list from mouser invoice (sans the max243, which I ordered as a sample from maxim):
ORDERED STOCK NUMBER SHIPPED PRICE EXTENDED
-----------------------------------------------------------------
1 152-3309 1 1.190 1.19
Kobiconn D-Sub Conne
9C R/A PCB PLUG
1 71-CCF07-G-1K 1 0.020 0.02
Vishay/Dale 1/4WATT
1/4watt 1Kohms 2%
1 71-CCF07-J-47K 1 0.020 0.02
Vishay/Dale 1/4WATT
1/4watt 47Kohms 5%
2 140-50N5-220J-TB-RC 2 0.060 0.12
Xicon Class 1 Cerami
50V 22pF NPO
1 520-HCA2000-20X 1 0.400 0.40
ECS HC-49/U Micropro
20MHz 20pF
4 80-C322C104M5U5HA 4 0.120 0.48
Kemet Conformally Co
50volts 0.1uF 20%
1 579-PIC16F87304SP 1 7.460 7.46
Microchip PICmicro -
7KB 192 RAM 22 I/O
ended up about 16$ after shipping. It's an rs232 based logic analyzer that displays and logs data on your pc. You'll also need a pic programmer if you don't have one already. Dunno how well it works but I figure it's worth a shot. you can do one cheaper with a parallel port, but my lappy's only got serial.