Getting 'Yellow River Kingdom' Working on RISC OS Pico

Jan 2, 2016

Getting 'Yellow River Kingdom' Working on RISC OS Pico

I recently got my copy of RISC OS Pico, and the very first thing that I wanted to try was running some software from the BBC Welcome Disc. Now, my favourite item on there was a game called Yellow River Kingdom. Here's how to get it running on RiscOS Pico.

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Latest News on the COLLIER-1

Oct 3, 2013

Latest News on the COLLIER-1

Well, I've had a frustrating weekend! The EEPROM programmer which I bought from China turned out to be a load of rubbish, so I've sent it back and I'm building my own EEPROM programmer with an Arduino Uno. I'm also taking the opportunity of the time it'll take to get that working to get some new kit in. I'm still sticking with the Z80 for the time being, I don't want the additional trouble of wiring in the 6809 for the moment. Read more for component list and the first program written for the COLLIER-1!

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Clock circuit and free run - the COLLIER-1 comes alive!

Feb 9, 2013

Clock circuit and free run - the COLLIER-1 comes alive!

So! This morning, I built a clock circuit, and wired it across to the Z80. The breadboard on the left hand side is the clock circuit. All those black leads on the left of the Z80 are the data bus, which I've wired to the ground to set up a NOP, instruction 0. By constantly providing NOPs each time the processor requests an instruction, the system ought to start at address zero, go all the way to address 65535, and cycle around again. The LEDs are wired to the address bus, to give us an idea of the behaviour of the CPU as it cycles through the address range.

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Preparing the Breadboard for a Test Run - Also a Dream

Feb 2, 2013

Preparing the Breadboard for a Test Run - Also a Dream

Okay, so, small steps first. To begin with, I'll use a battery power source. This is the breadboard set up for everything else to go in. The 5V regulator seems to work fine. You'll also notice that the supply of chocolate biscuits is also still in good order (v. important). So, the plan today had been to set a Z80 up for a free run. Alas, it was not to be.

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COLLIER-1 Memory Map

Feb 1, 2013

COLLIER-1 Memory Map

I'll have 64Kb of address space to play with on the COLLIER-1, and this is how I plan on playing with it, from bottom to top.

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Planning the COLLIER-1

Jan 31, 2013

Planning the COLLIER-1

Hi all, I've had a long-standing (and by this I mean "since around the age of eleven") desire to build a computer from scratch. I've finally planned some computer-weekends, and have started collecting the raw materials for a computer. The first decision that I had to make was about the processor to use.

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