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ALU and Instruction Set
Log from Novasaur CP/M TTL Retrocomputer
Hardware testing is complete on all the jump and branch instructions. So that's the first 8 out of 256 instructions tested! The next 24 are loading operands. These should work fine since the jump/branch instructions are also loading operands in order...

The actual informations
Log from Extension card for TDS3000 scopes
Detecting and identifying a card As stated in an earlier log, the card insertion is detected by grounding the pin *CD. But this is not enough to make the scope believe he have a know card inside him. You need to indicate him what type of card was inserted....

Soldering perfboard
Log from Earth Lander 84
I took a perfboard and soldered up power and the data/address busses of the MCU, SRAM, NVRAM and the address bus latch.I did't really care about the exact order of the bits when wiring them up, I just went for the easiest layout. I'm not really sure...

Remapping the Keyboard
Log from A DIY Keyboard
Remapping the KeyboardGiven most of the work is done with the "basic shift logic" how hard could it be?The basic shift logic:Well much harder than expected, here is the schematic:Now many will recognise this as a PLA (Programmable Logic Array).Designing...

Backplane
Log from Old school IC tester
I decided that interface between ZIF-socket and host machine will be implemented with help of this antique ISA backplane manufactured in 1984 (I bought it for about $20 last month):I cut out it a little to remove part with pull-up resistors, because...

Peak Performance
Log from SpiroBoard Aeroponics pH / EC / Motor Controller
Below is a picture of a patch that gates the input to the ADC so that it is only looking at the value from the EC probe at the end of the square wave pulse, after the initial transient has settled out. It works really well, dutifully recording the voltage...

Software
Log from Roamer, the Self Charging Companion Robot
When Roamer's bumper is depressed, there are five possible "backup and turn" scenarios--the activation choice is random.After 30 seconds of forward movement (stuck spinning wheels without depressing the bumper or long distance), she backs up and tries...

Digital Pot Shots
Log from SpiroBoard Aeroponics pH / EC / Motor Controller
As you can see below, I am breadboarding the new peak detector changes before committing to a new PC board. One of the changes involves using a MAX5387 digital potentiometer to control the square wave amplitude and EC amplifier gain. The...

EC firmware dumped
Log from Reverse engineering Toshiba R100 BIOS
After another long hiatus, I've come back to this project. Let's break this thing!I've etched a new board that lets me access important pins (serial TX, RX, CLK, BUSY ; RST and power lines) without having to fiddle with the previous hacky breakout board.I've...

Project Log 67: DIY Linear Actuator.³
Log from DIY Mech/Exoskeleton suit.
Sunday, 13/08/2023, 10:55. I can't believe I'm saying this, but I think I will go back to the reversibly actuated artificial muscles. Yes, I know, I know, I just wasted so much time taking each single approach for their efficiency and now I'm throwing...

Optimisation
Log from Software Phase Locked Loop
OptimisationI have been considering what to do next with the software PLL. Do I go the simple low pass filter and move on or spend more time optimising. It is a question of time versus likely outcomes. I have a good result, is it worth trying to make...

PS3/4 Controller
Log from $10 Robot!
We already use Playstation controllers for the other robots that we use in our club, there's also a prety good chance that the students will have them at home. So It makes sense to use them with the $10Robot! as well. A quick bit of googling lead me...

Step 2: How to Use UWB Positioning
Log from Multi-anchor Multi-tag Positioning System
1.No python environment required Use Type-C USB cable to connect the A0 and PC.Power other devices with 3.7V lithium batteries，and adjust the positions of A1, A2 and A3 so that they form a square of 10 metres with A0.Open position.exe, and...

Schematic of the CPU
Log from 1 Square Inch TTL CPU
Time to fully disclose the operation of the CPU ! The complete schematics can be found in the files section, SQ1C1841.PDF. REGISTER B Let's start with the simplest part. Since the CPU has no ALU, the most important task of the CPU is moving data...

New Print Function
Log from Merlin
The EVE chip has a number of built in fonts. You can access them directly using the "cmd_text" command. I've added a new basic command in addition to the PRINT command - "GDPRINT"You can specify the font (#16-31), cursor position and colour, plus a string...

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