30 September 2023 - 06 October 2023
Table of Contents
- 1. MIT OCW
- 2. wood chips
- 3. MJK Burial
- 4. SCZ Front Step
- 5. EPLDH
- 6. wktpqb
- 7. bwmse
- 8. Forth Floating Point
- 9. Compilers
- 10. Mill Controller #2
- 11. Alum Rock Data Center
- 12. CA Root Key Generation
- 13. Virtual Orchestra
- 14. gat
- 15. RIOT drivers
- 16. mcd05 32 button/led box
- 17. AMD 2900 bitslice computing
- 18. Hitachi HD68B09E CPU
- 19. Rockwell R65F11
- 20. PLD programming
- 21. EPROM Programming
- 22. POSIT
- 23. MAME
- 24. More project ideas
- 25. David Davies
1. MIT OCW
1.1. 18.03sc (differential equations).
1.1.1. Unit III - (Laplace) Solving Initial Value Problems
2. wood chips
Continuing.
3. MJK Burial
3.1. 17 Oct 23 1400
4. SCZ Front Step
4.1. Side window patch glued in
5. EPLDH
5.1. MPFI interval arithmetic better alternative
6. wktpqb
6.1. Verifying edge construction (con't.)
6.2. 'gcd' algorithm doesn't work
8. Forth Floating Point
8.1. Ended consideration
Need to finish pqb first!
9. Compilers
9.1. Started hand written WSN parser
10. Mill Controller #2
10.1. Mounted on mill - ready or testing
10.2. Need to investigate new HW/SW for eventual replacements
10.2.1. Old crap ain't gonna last forever
10.2.2. Buildroot/Linux 5.15 PREEMPT + latency tools
First pass done - boots on real hardware
10.3. Alternative architecture
10.3.1. Split off stepper motor controller to separate board
Increase latency tolerance on controller
10.3.2. Use emc2 MODBUS/TCP protocol for stepper and other IO
11. Alum Rock Data Center
11.1. need to check rocky, others? (arch?) for suitability
11.2. recheck ALMA, now that CERN and Fermilab are using it
11.3. Sonic.net has announced that Fiber connectivity is coming to my house
11.4. The end of DSL and static IP addresses as I know it
Started with Northpoint communications in the late 1990's. I guess that's a good long run.
12. CA Root Key Generation
Nice to have an appliance that manages keys. Could just buy something from nitrokey https://www.nitrokey.com/
12.1. Need to be clear on security properties.
Definitely protect against remote access to private keys. How strong does the protection against local access need to be?
12.2. Simple hardware.
12.3. USB Serial interface only but no credentials across USB I/F.
But this potentially exposes the hardware to remote access via the USB I/F when connected.
12.4. Use Sneakernet
Using "disk drive" IO introduces air gap - remote access impossible. Increases attack surface via filesystem manipulation.
12.5. Beagleboard
Found in SCZ. Thought it was in SJ.
12.6. LCD Touchscreen
Unlocks encrypted filesystem. Maybe not needed. See below.
12.7. Morse code PIN
Only need ONE button, and a pass/fail LED. Hardware will never go EOL (Thanks Elena!). Susceptible to remote audio recording of PIN button noise, which could be overcome by using 2FA. Again - what am I protecting against?
12.8. Encrypted Filesystem
13. Virtual Orchestra
13.1. sfz file tests
13.1.1. need tooling to edit sample files
13.2. increasingly skeptical whether quality results are possible
13.3. maybe should treat as platform for concatinative synthesis
13.4. maybe should just accept the limitations and work with it
One should not be disappointed that a guitar can't sound like a flute.
14. gat
14.1. spectrogram done - matches 'octave' output
15. RIOT drivers
Implemented - needs testing.
15.1. WS2801
15.2. Velleman KA03
15.3. Velleman KA05
16. mcd05 32 button/led box
16.1. Recovered schematics.
16.2. Planning software.
16.3. Received STM32F767 Nucleo144 with Ethernet.
16.3.1. Test program running.
16.3.2. Need to consider CoAP multicast discovery.
16.3.3. Consider simpler architecture with STM32F767 as a 'hub'.
16.3.4. Consider CAN interface to hub.
17. AMD 2900 bitslice computing
17.1. Probably my oldest uncompleted project
17.2. Exploring possibilities for something constructive
Create verilog models for 2903/2910 and verify against hardware?
18. Hitachi HD68B09E CPU
18.1. RAM/UART/IO
18.2. Started schematic
18.2.1. Standard peripheral set for 8 bit CPU bringups
Board schematic planned - need Kicad symbols
18.3. Arduino Mega 2560 DMA loader
…Along with standard 8 bit loader
18.4. Generate quadrature clock directly
18.5. Full Bus SW Emulation infeasible
6809 1000ns maximum cycle time too short
19. Rockwell R65F11
19.1. Still evaluating.
19.2. Dev board
Reverse engineered some of a mostly fully built development board with one part missing. As near as I can tell, that one part is some sort of programmable address decoder with a pinout that does not correspond to any part I can find. Kind of like a GAL but with inputs on top and outputs on bottom (as opposed to left and right in a standard GAL). I have no idea what the provenance of this board is and if it ever worked.
20. PLD programming
Looks like Atmel 16V8 is the last 5V PLD part left standing. Maybe not surprising that there still doesn't appear to be a fully open source tool chain for programming. How hard could it be? (!) Could next-pnr generic help? Might be easier to use espresso for logic array and program output logic bits directly for simple stuff.
21. EPROM Programming
Found some software for Needham programmer. Need to check electrolytic caps on ISA board.
22. POSIT
Use POSITs for YRX?
23. MAME
23.1. Subset builds in debug mode
Full debug fails - not enough disk or memory.
23.2. gs6809 serial IO doesn't work right with PTY and other streams
23.3. ampro (Z80/Z80SIO) does work with PTY
23.4. Evaluating what is needed for other emulators.
24. More project ideas
24.1. Zuse Z3 simulation in Verilog
Good excuse for floating point ALU design. Try posit format?
24.2. GMPForth ports to simulators
24.2.1. SIMH for some targets (vax)
24.2.2. MAME looks interesting for microprocessor system emulations
How to support ersatz systems?
24.2.3. Ports to classic figFORTH targets
24.3. GMPASM assembler
May be useful for handbuilt and rare systems (DMX1000?).
24.4. Extracting ISO Superboard Forth ROMS for MAME emulation
24.5. 'bwocl' OpenCL tooling
24.5.1. Offline compilation
24.5.2. Standard Kernel Running
24.6. hardware support for classic 5V CPUs
24.6.1. RTX2000, CDP1802 still available!
24.6.2. 6502, 68000, 320C30, others on hand
24.6.3. CPUs with totally async bus may be supportable without RAM
24.6.4. Could use small footprint monitor in asm (gmpmon?)
24.7. Existing 'retro' hardware still working?
24.7.1. OSI Superboard
Unknown. Composite to VGA adapter didn't seem to work. Needs analysis. Found OSI model 610 board underneath!
24.7.2. Super Jolt
No output. Needs analysis.
24.7.3. Ampro Little Board
Not booting. Needs analysis.
24.7.4. Rockwell R65F11 Demo board
UART sending "NO ROM" at 2400 7N1 as expected with 2MHz xtal. MAME emulator possibilities?
24.7.5. NMIX-0016
Works. Found original prom in a parts stash(!).