My github: https://github.com/doug-h-rice
Here were a few thoughts and scribbles.
midi lead midi lead
Welcome to my wiki.
This page contains random thoughts not fully thought out.
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http://www.dougrice.plus.com/dev/sportstimer.htm - sports timer
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
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
pi config - notes on setting up my pi
I used to have a Science of Cambridge MK14 and a NASCOM 2. Here are some notes.
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.
Grant Searle has published some designs for minimal component microprocessor boards that run Microsoft BASIC.
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
Grant's website havs spawned many projects
This one is useful. Doug has ported Grants code to many FPGA boards.
It seems to be under a tidy up ( April 2020 )
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
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.
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
Version 1.0.0 configuration R1 for Z80 based RC2014 systems
In passing I found these. Raspberry Pi Bare Metal
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.
Have a look at: http://www.dougrice.plus.com/Erlangs/adsl.htm
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
twos compliment twos compliment numbers
Dead Band Schmitt Trigger - Schmitt Trigger with LOW,OK,HIGH output and hysterisis
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