Author Archives: blogmywiki

Drive 4 digit 7-segment LED displays direct from a micro:bit

Posted on April 3, 2021 by blogmywiki

I bought a bag of random 7-segment LED displays to play around with, originally with the idea of adding them to the address and data busses on my 6502 breadboard computer. That became a bit tricky, but I got thinking … Continue reading →

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6502 breadboard computer part 8 – next steps

Posted on April 2, 2021 by blogmywiki

I recently achieved my goal of making a 1970s-style 6502 breadboard computer that I can use to practice machine code programming. It has a hexadecimal keypad for entering instructions, a 16×2 alphanumeric LCD display and a very basic monitor program … Continue reading →

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6502 breadboard computer part 7 – working monitor program!

Posted on March 21, 2021 by blogmywiki

I love it when things work! Ok, it wasn’t entirely plain sailing, but progress on this has been rapid in the last few months. A quick recap: As a child in the 1970s I wanted my own self-contained single-board computer … Continue reading →

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6502 breadboard computer – part 6 – shift key

Posted on March 20, 2021 by blogmywiki

Last time I added a 4×4 keypad to my 6502 breadboard computer so I can enter opcodes as hexadecimal numbers, but I was worried that I needed more keys and didn’t have enough I/O pins left. To make a self-contained … Continue reading →

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6502 breadboard computer – part 5 hex keypad

Posted on March 14, 2021 by blogmywiki

Having made a very simple proto-monitor work that allows me just to read the contents of memory on the LCD display, I decided to get a hex keypad working as a next step. Eventually I’ll use the hex keypad to … Continue reading →

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