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My Web Site:
 http://www.dougrice.plus.com/ 
 http://ccgi.dougrice.plus.com/ 
 http://www.dougrice.co.uk

My github: https://github.com/doug-h-rice

Info

Here were a few thoughts and scribbles.

midi lead midi lead

signalling

Welcome to my wiki.

Doug's Wiki

This page contains random thoughts not fully thought out.

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JavaScript prototypes for PIC projects

http://www.dougrice.plus.com/dev/sportstimer.htm - sports timer

http://www.dougrice.plus.com/dev/ratemultiplier.htm - JavaScript Rate Multiplier.

http://www.dougrice.plus.com/dev/pulseStretch.htm - measures input pulse and then outputs a pulse 5 times longer

http://www.dougrice.plus.com/dev/pulseStretch2.htm - Using leaky bucket to strech pulse 5 times longer

http://www.dougrice.plus.com/dev/timer0_c.txt

PIC projects

PIC 10F204 PIC10F204 random number generator.

PIC 16F88 driving IIC display PIC 16F88 driving IIC display

PIC 16F819 IIC/Serial demo with debug of SSPSTAT PIC 16F819 IIC / Serial demo with debug of SSPSTAT

Contact Bounce example Contact Bounce example

Raspberry Pi projects

pi config - notes on setting up my pi

plotting DS18S20 temperature readings using SVG

Arduino projects

Arduino Colordunio And SVG Projects

Old Computer projects and dabbles

MK14

I used to have a Science of Cambridge MK14 and a NASCOM 2. Here are some notes.

MK14 notes

MK14 KarenOrton pictures

My attempt to get a javaScript version running in a web browser

 http://www.dougrice.plus.com/mk14/seg_mk14.htm

see: https://github.com/doug-h-rice for an emulator that used SDL for the screen and keyboard. There is also a java version. Also a PC version that builds using Tiny C.

NASCOM2

Nascom 2 Notes

Multicomp minimal component microprocessors

Grant Searle has published some designs for minimal component microprocessor boards that run Microsoft BASIC.

http://searle.wales/

Minimal component Z80,6502,6809 boards are popular. He has an FPGA version.

My Minimal component Z80 emulator system based on Grant's multicomp. https://github.com/doug-h-rice/virtual-multicomp

Multicomp reworks and Tribute sites

Grant's website havs spawned many projects

https://github.com/douggilliland

This one is useful. Doug has ported Grants code to many FPGA boards.

It seems to be under a tidy up ( April 2020 )

6809 - Grant Searle's Multicomp FPGA

I remember somebody at the Coventry computer club being enthusiastic about the 6809 in 1979. Here are some notes about getting some assembler code into an FPGA

My Notes on 6809

The emulated CPU communicates with the host using the UART.

This is summarised as a TX and RX register and two flags TxEmpty and RxFull.

Emulated CPU - UART:-

  A write to TX resets TxEmpty.
  A read from RX resets RxFull.

UART - Host:-

  A read from TX sets TxEmpty.
  A write to RX sets RxFull.

RC2014 Z80 SBC

Spencer Owen's Z80 system similar to multicomp. https://rc2014.co.uk/

Small Computer Monitor by Stephen C Cousins ( www.scc.me.uk ) Version 1.0.0 configuration R1 for Z80 based RC2014 systems

https://smallcomputercentral.wordpress.com/small-computer-monitor/small-computer-monitor-v1-0/

Version 1.0.0 configuration R1 for Z80 based RC2014 systems

Z80

In passing I found these. Raspberry Pi Bare Metal

https://ultibo.org/ https://ultibo.org/make/

Running CP/M on a Raspberry Pi Bare Metal.

This is good for old models of the PI that are slow with the later RPi builds.

http://www.projekte.daleske.de/prog/11_EMUZ80_RPI/prog_EMUZ80_RPI_en.htm

8051

8051 CY7C68013 EZ-USB FX2 USB 2.0 Development Kit Ebay suggested I buy one of these. I was looking for a microprocessor that did not boot from internal FLASH memory!

http://www.dougrice.plus.com/dev/cypress/notes_dhr.txt

http://www.dougrice.plus.com/dev/cypress

ADSL

Have a look at: http://www.dougrice.plus.com/Erlangs/adsl.htm

Doddles

Ideas that are still being thought through.

Multidimensional entity relationship diagrams Multidimensional entity relationship diagrams.

Complex base numbers Complex base numbers.

MISS Managing Insitutions that Sub Sample

SERIAL Serial

twos compliment twos compliment numbers

Wet String Theory

[state space]?

PicThoughts

function calls

integration and feedback

integration and feedback2

callGen

Dead Band Schmitt Trigger - Schmitt Trigger with LOW,OK,HIGH output and hysterisis

hand shakes

tides?

treeCompare

website

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Don't forget the batteries


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