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Inter-globule communication
Log from F-CPU
So far, the 2R1W opcodes have 1 full destination field (6 bits) that determines the globule number, one partial source register address within the same globule, and one full register address that can read from any other globule. It's quite efficient...

Tagged Control Stack
Log from F-CPU
Tagged registers (see 14. Tagged registers) might not be the best idea ever. OK. But my latest musings about the stacks (#A stack.) and the support from various languages made me realise that a different view is necessary. The usual C stack is a merged...

What's Required.
Log from Chalkboard Plotter
I'm chilling at crashspace and diving into this project. Phase IIRequirements and MetricsBased on customer needs above I’ve compiled this list of requirements, and the metrics by which to measure them by. I’ve split this into subjective measures and...

Multiplication Hardware
Log from BREDSAC
Moving the Unused Bit Here are the changes I made to move the unused bit to the least significant end. The carry-in logic and initialisation of the Zero FF now takes place at T1 of an LSW instead of T0. The logic for extending bit 16 to bit 17 of an...

Multiply Instructions
Log from BREDSAC
Microcode for the single-word Multiply and Add instruction: # OPCODE L STAT : SHS EOI RFA XSEL CMX YSEL CARRY WRF ODD SS1 MSW LSW MMSW MLSW WMEM MISC INCMS UBCOND UBADDR # V - Multiply and add 11111 0 0001 : SHS - 00 X0 - Y0 CY0 -- - - - - - - - ---...

ALU
Log from ECM-16/TTL homebrew computer
EDIT: the final, completed in hardware, version of ALU described in newer post. Original: This is the description of the Arithmetic-logic unit of this "computer". Most of it I conceived a year ago, and now, after some modifications, it is one of...

▇▇▇▇ State Minimization (and Should You?) ▇▇▇▇
Instructions from FPGA Boot Camp #4: State Machines
Remember the coin example from earlier? You could have a state that shows you had a dime and a nickle and another state for a nickle and a dime. But it was smarter to have one state for 15 cents. This is an example of state minimization. If you were...

The Address Decoder
Log from rosco_m68k
Address decoding for the m68k is a bit more involved than for most (all?) of the 8-bit CPUs that were around at the same time, and so requires a bit more careful design. The specific things that make it complicated are:The larger (16MB) address spaceThe...

Grove - Dust Sensor (PPD42NS) Review
Details from Grove - Dust Sensor (PPD42NS) Review
Product Specifications General Type: SensorArchitecture: For ArduinoOutput Signal: Digital (Negative Logic and PWM)Detectable Range of Concentration: 0 ~ 280000 pcs/litre (0 ~ 8000 pcs/0.01cf CF = 283 ml)Detectable particle diameter: >...

Low-Profile Pin Headers
Log from PicoPew
Attempting to make the whole package thinner, I went looking for shorter female pin headers than the 8 mm ones I had used. At western distributors, I found four manufacturers with suitable products: Samtec, 3M, PRECI-DIP, and Mill-Max. Three of them...

Sound Check
Instructions from Retrex Audio
This is the quick hack of another code sample "Register writer" to play a warm up sound. The hardware is based on the schematic linked in the code. Works with Arduino Uno R3 aka: 328 compatible boards. https://pastebin.com/raw/FehmVLQS /*******************************************************************...

Fanatec ClubSport Shifter SQ v1.5 USB adapter DIY
Details from Fanatec ClubSport Shifter SQ v1.5 USB adapter DIY
Full Arduino sketch (works on Due): https://gist.github.com/summivox/cfbcb8d309d416cefc3c0df10379339f Interface with Shifter This unit is kinda special as it can act as either an H-pattern or a sequential shifter: The H-pattern mode should be presented...

Shifter Boards - Reverse Engineered!
Log from Fanatec ClubSport Shifter SQ v1.5 USB adapter DIY
Even though it's enough to treat the shifter as a black box if the end goal is just to interface with it, curiosity took over and I decided to trace out both boards on the shifter.X-Axis Sensor BoardThis is actually very simple: HMC1501 (SOIC-8 package...

Initial steps
Log from Raspberry Pi I2C Interfacing
2020-10-27 Ordered modules to play with: AZDelivery ADS1115 ADC Analog to Digital Converter 16bit 4-Channel Module (pack of 3)AZDelivery I2C 0.96-inch OLED Display SSD1306 128x64 Pixels IIC 3.3V 5V White Character DisplayAZDelivery MCP23017 16-bit Bidirectional...

Q2 Computer
Details from Q2 Computer
Background Making a computer out of 7400-series logic, FPGAs, or PLDs is fun, but a lot of the complexity hides in those integrated circuits and their structure significantly affects any design that uses them. This led me to design and...

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