Skip to content
Skip to main navigation
Skip to first column
Skip to second column
JAQ's Blog - Electronics, Microcontrollers, DEC Minicomputers, Raspberry Pi, Airplanes and other stuff....
Total: 9 results found.
TRS-80 Model 1 FreHD Expansion Interface
... ROM replacement on a stock 16K Model 1. The small board a
32K RAM (bringing the total Model 1 RAM to 48K), an optional EPROM mapped to the empty address block at 0x3000 (for hackers ...
GPS Connection to Hans Summers Ultimate 3 QRSS Kit
A few years back I built a QRSS transmitter (for slow morse and WSPR) based on a recycled DLink DSL-502T router running OpenWRT and connected to an Si570
module. (http://www.quicktrip.co.nz/jaqblog/home/44-si570qrss) ...
Kaypro / FreHD Adaptor
... in the Z80 socket is used. The shim provides access to the required Z80 signals but also a
buffering to the address, data and IO control lines. Does that mean the Kaypro used the same pin ...
CAT Interface for eBay AD9850 DDS Modules - Part 2
After changing from using the Yaesu FT-817 protocol I picked the ICOM IC-725 as a reference having never seen one. It seemed fairly representative of the use case for the
module as a generic ...
CAT Interface for eBay AD9850 DDS Modules
... protocol so the
module can be used in a rig and powered by Ham Radio Deluxe. I started by trying to implement the Yaesu FT-817 CAT protocol. It seemed fairly simple and didn't require a ...
eBay AD9850 Module Test Board
Test board for the cheap eBay
modules. The board is based on a design by WB2V with software enhancements by AA0ED and AA0ZZ. The cheap AD9850
modules currently available on eBay are ...
eBay AD9850 Module Pinout
The cheap AD9850
modules currently available on eBay are a great starting point for a signal generator project but are a little short on documentation. The pinout and relationship to ...
Codan N3ZI DDS
Another project in progress.... installing an N3ZI
2 into a Codan 6801 Marine transceiver. The N3ZI works well as a crystal replacement and requires no buffer amplifier in ...
SI570 QRSS Beacon
My MEPT QRSS and WSPR beacon is controlled by a DLink DSL-502T running OpenWRT. The QRSS and WSPR messages are generated by directly controlling the frequency of an Si570 chip. The interface ...
PDP8 SBC6120 FP6120
My Other Sites
Contact Andrew Quinn