If you don’t have it you can try to build by yourself cheap logic analyzer device using parallel port. The device only use few resistors and IC 74HC245 as data buffer. To display the graphical output from logic analyzer device you can use Fabulous Logic Analyzer software, here.
Schematic:
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| Parallel Port logic analyzer |
Component Required:
IC1, 74HC245
R1-R8, 10K ohm
R9-R16, 100 ohm
R17, 2K ohm
LED
DB25 Male, Parallel Port Connector
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Building this parallel port logic analyzer was such a rewarding project! The schematic is straightforward, but the real test came during the PCB assembly. Soldering those components required a steady hand, especially when seating the connectors to ensure solid contact with the parallel port. Once everything was assembled, it worked perfectly for debugging my basic microcontroller circuits. It’s an incredibly cost-effective tool for anyone just getting into digital signal analysis. If you are comfortable with basic PCB assembly, I highly recommend putting one together. It’s a classic piece of hardware that still holds its own for simple, low-speed signal troubleshooting tasks!
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