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Having fun with electronics and old computers..

Blog

• 2025/12/26 Fun with flags ;)
• 2025/11/30 Adding "ALU Operation" UI
• 2025/11/29 Fixing schematic and board, and adding more commands
• 2025/11/28 A Java GUI controller program for the ALU Board
• 2025/10/18 A 16-bit ALU board using am2901 bitslice alu + registers

MiniComputers

• PDP Common info
• The PDP 11/10
• PDP-11/44
• Peripherals
• The Unibone
• The HP 1000 (2100 E-series 2113B)

Computers and Calculators

• Dolch Pac 64
• HP 85A
• HP 9825A

Vintage Equipment

• Digital
• Oscilloscopes
• Serial data analyzers / Network analyzers
• Signal generators / RF
• Voltage/Multimeters

Other Hardware

• DEC Digital M7264-EB QBUS LSI-11/03 CPU CARD
• HP 7470A Plotter
• HP82901M Disk drives
• The BASF 6102 8 inch floppy drive (dead)
• The Kienzle 1140-20 Taxameter
• The Shugart SA801 diskette drive

Hobby Projects

• 8-bit 7-segment bus display board
• PDP KM11 debugging board
• Amplifiers
• CPU Experiments with am29xx bitslice chips
• Core memory experiments
• Led matrix fun
• Mini fast pulse generator
• VIC 20 repair
• Z80 Hobby board

Software I have written or worked on

• The interactive pdp-11 disassembler
• Sigrok and other logic analyzer decoders
• The DomUI user interface framework
• The new QUniBone software: QUniLator!
• PDP11GUI in Java

Tips and tricks

• Components and datasheets
• Creating/Debugging Saleae analyzers
• Installing Windows versions on old PCs
• KICAD Tips and tricks
• Linux tips and tricks
• Updating the TL866/II using Minipro
• Using GPIB on Linux