The restoration of two Amiga 1200s

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As a brief interlude, and before getting back to FPGAs, I wanted to document something I consider to be tremendously important: the restoration of my beloved Amiga 1200. I own two of these machines: the original one I bought in the summer of 1993 just before starting university, and a “spare” I bought off eBay about 10 years ago. As… Read more »

Design and build of a Lattice iCE40UP development board

It’s been another nine months since the last post. I will not dwell on the reasons for the lack of updates, except to say I have been busy with my projects; I just haven’t had the enthusiasm to post here until now. However the next post will go over some smaller projects I’ve completed recently, but this post is dedicated… Read more »

A status update and playing with Home Assistant

It’s been eight months since I last wrote in this blog. To my regular readers, should I happen to have any, I’m really sorry about that. The main reason for the large gap is I had a full time job and therefore had a massively reduced amount of free time. I say had because it’s no longer the case for… Read more »

The beginnings of an LLVM backend

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I’ve been very busy for the last few months, with many different things. This post will therefore be a bit of a mess, unfortunately. I’m at a place where I’ve been before a few times: not knowing the most interesting road to explore, since there are so many, and they are all fascinating and rewarding in their own way. First… Read more »

Designing a 32 bit ISA

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As mentioned at the bottom of the previous post, I’ve been designing a new 32 bit processor, and this post is concerned with the design of that processor’s Instruction Set Architecture. The objectives for this project are as follows: To learn as much as possible from the experience To leverage what I learned making my previous 16 bit processor To… Read more »

Further progress on the Linux port for MAXI030

Since the last post I have added functionality necessary to make it possible to use the computer from a directly connected keyboard and screen. This required two things: Making the already written PS/2 controller VHDL implementation available to the Linux kernel by adding a PS/2 driver. Modifying the existing, and somewhat hacky, VGA controller for my video card and writing… Read more »

Building the MAXI030

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While working on the design for MAXI030 I completed another project: a new workbench microscope. After watching various videos on the topic, I came to the conclusion that a setup with just a camera and large TFT screen would be best for me, ie. one without eye pieces. I have various things wrong with my eyes, including poor stereoscopic vision,… Read more »

The design of a 68030 based expandable computer

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Though the 68020 based MIDI020 computer is a workable design, it suffers from a few problems: The main one is the board is not 100% reliable. Very occasionally it will fail to start. I’ve tried to diagnose this problem but without success I can only run the processor at half the rated speed, 12.5MHz if the SIMM slot is used… Read more »

The build of a video and sound card for MIDI020

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Three PCBs arrived promptly from JLCPCB: The version 2 Test+SRAM board The version 2 Ethernet+Printer+Joystick board The version 1 Video+Sound board The version 1 of the top two boards are described at the bottom of the post about the  MIDI020 68020 computer, if you haven’t read it. The first job was to build up the version 2 Test+SRAM board. Whereupon… Read more »