Suzy's Blog

Wooden boatbuilding, Lugged steel bicycle frames, computers. The usual.

Thursday, 26 June 2025

A Z180 Freebee

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When I was young, I read byte. I was a weird kid. One of my favourite columns was Steve Garcia's Circuit Cellar, because he had a rea...
Sunday, 11 May 2025

Moar Video Memory

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Brad and uBee on MSPP ganged up on me. The Microbee Premium is capable of running a full 32K of PCG RAM, if you unsolder the two 0.6...
Friday, 9 May 2025

Freebees in the wild

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I've been encouraging people building Freebees to post pictures of their machines. I derive great satisfaction from seeing the custom...
Saturday, 15 March 2025

A second stab at a ROM Emulator, using a Teensy 4.0

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After assembling the ROM Emulator using an ATMega and some RAM, I had issues getting it going. I could connect to the emulator using a te...
Wednesday, 26 February 2025

Keep it simple, stupid! A straightforward boot ROM for Freebee

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I've been inflicting my buggy boot code with monitor etc on people, which is making their experiences in building Freebee more diffic...
Saturday, 1 February 2025

MCLZ8 on Freebee

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So it turns out you can emulate a Z80 using a Teensy 4.1. Better yet, with the aid of a few voltage translators on a little interposer bo...
Thursday, 2 January 2025

An STD Bus Video Card that does CGA and EGA resolutions

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With the latest release of Freebee Fremium, I added circuitry to invert VSYNC. This is useful to convince a multisync monitor (or upscale...
Saturday, 28 December 2024

Freebee Fremium Production Release

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I've spent a week or so of my holidays getting the Freebee Fremium design ready to go out. I am hoping that the changes I've made to...
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