Welcome to decuser’s blog
Topics on this blog include computing, retro-computing, operating systems, math, and whatever other technical subjects I happen to be exploring that I find interesting enough to take and share notes about.
Posts
-
Long Road Back to the Tandy TRS-80 Model 100
-
Installing and Using Unix V6 in the Open SIMH PDP-11 Emulator
This note details the process of building a working v6 instance from a copy of the original tape distribution. The v6 instance runs in a virtual PDP-11/40 provided by OpenSIMH, a masterwork emulator.
-
Programming the PAL-1 Using the Keypad
A video walking the user through the process of programming the PAL-1 using the keypad. It begins with a short overview of the PAL-1, then covers prelims like where the START program resides in ROM, how to set up the IRQ and NMI vectors, how to view the Accumulator contents, how to enter a program, where it should go, and how to run it normally and single step.
Enjoy!
-
Ohm's Law Power Wheel Made Simple and Rational
-
Nyquist what?! Gobsmacked by Sampling Frequency
A note to capture what I learned the hard way about sampling frequencies.
-
Using an el-cheapo logic analyser to detect address bus activity
This note documents my exploration of using a $9.99 logic analyzer to watch my PAL-1 go through some address bus gyrations.
-
PAL-1 Entering a Program via Serial Port
Note describing a minimalist example of how to input via serial and run a program on the PAL-1.
-
PAL-1 Entering a Program at the Keypad
Note describing a minimalist example of how to input and run a program on the PAL-1.
-
PAL-1 Loading MOS Paper Tape to RAM
This post describes how to get your Mac talking to your PAL-1 in order to send MOS papertape format ascii files via minicom to your PAL-1 and run them. Future installments will go into more detail, from the ground up.
-
PAL-1 Resources A Curated List
This is my curated list of resources. The manuals, books, videos, and sites referenced below are ones that I found useful and interesting, and occasionally enlightening. This is not an exhaustive list.