29 July 2023 - 04 August 2023

1. MIT OCW
- 1.1. 18.03sc (differential equations).
  - 1.1.1. Unit II - Exam 2/Unit III Fourier Series
2. wood chips
3. MJK Memorial
- 3.1. More pictures sorted
4. Santa Cruz short fence
- 4.1. Disassembled
- 4.2. Posts replaced
- 4.3. Frame reassembled
5. EPLDH
- 5.1. Investigating quadratic field sqrt(3) integers and rationals.
6. Compilers
- 6.1. Started hand written WSN parser
7. Mill Controller #2
- 7.1. Mounted on mill - ready or testing
- 7.2. Need to investigate new HW/SW for eventual replacements
  - 7.2.1. Old crap ain't gonna last forever
  - 7.2.2. Buildroot/Linux 5.15 PREEMPT + latency tools
- 7.3. Alternative architecture
  - 7.3.1. Split off stepper motor controller to separate board
  - 7.3.2. Use emc2 MODBUS/TCP protocol for stepper and other IO
8. Alum Rock Data Center
- 8.1. need to check rocky, others? (arch?) for suitability
- 8.2. recheck ALMA, now that CERN and Fermilab are using it
- 8.3. Sonic.net has announced that Fiber connectivity is coming to my house
- 8.4. The end of DSL and static IP addresses as I know it
- 8.5. Need a VPS with static IP
9. CA Root Key Generation
- 9.1. Need to be clear on security properties.
- 9.2. Simple hardware.
- 9.3. USB Serial interface only but no credentials across USB I/F.
- 9.4. Use Sneakernet
- 9.5. Beagleboard
- 9.6. LCD Touchscreen
- 9.7. Morse code PIN
- 9.8. Encrypted Filesystem
10. Virtual Orchestra
- 10.1. sfz file tests
  - 10.1.1. need tooling to edit sample files
- 10.2. increasingly skeptical whether quality results are possible
- 10.3. maybe should treat as platform for concatinative synthesis
- 10.4. maybe should just accept the limitations and work with it
11. gat
- 11.1. spectrogram done - matches 'octave' output
12. RIOT drivers
- 12.1. WS2801
- 12.2. Velleman KA03
- 12.3. Velleman KA05
13. mcd05 32 button/led box
- 13.1. Recovered schematics.
- 13.2. Planning software.
- 13.3. Received STM32F767 Nucleo144 with Ethernet.
14. AMD 2900 bitslice computing
- 14.1. Probably my oldest uncompleted project
- 14.2. Exploring possibilities for something constructive
15. Hitachi HD68B09E CPU
- 15.1. RAM/UART/IO
- 15.2. Started schematic
  - 15.2.1. Standard peripheral set for 8 bit CPU bringups
- 15.3. Arduino Mega 2560 DMA loader
- 15.4. Generate quadrature clock directly
- 15.5. Full Bus SW Emulation infeasible
16. Rockwell R65F11
- 16.1. Still evaluating.
- 16.2. Dev board
17. PLD programming
18. EPROM Programming
19. POSIT
20. MAME
- 20.1. Subset builds in debug mode
- 20.2. gs6809 serial IO doesn't work right with PTY and other streams
- 20.3. ampro (Z80/Z80SIO) does work with PTY
- 20.4. Evaluating what is needed for other emulators.
21. More project ideas
- 21.1. Zuse Z3 simulation in Verilog
- 21.2. GMPForth ports to simulators
- 21.3. GMPASM assembler
- 21.4. Extracting ISO Superboard Forth ROMS for MAME emulation
- 21.5. 'bwocl' OpenCL tooling
  - 21.5.1. Offline compilation
  - 21.5.2. Standard Kernel Running
- 21.6. hardware support for classic 5V CPUs
- 21.7. Existing 'retro' hardware still working?
22. David Davies
- 22.1. Broadcom BCG? Employee indicted for running a brothel.
- 22.2. New case C1923172, consolidated with 15 Parties.
- 22.3. Next hearing 6/20/2023

1. MIT OCW

1.1. 18.03sc (differential equations).

1.1.1. Unit II - Exam 2/Unit III Fourier Series

2. wood chips

Continuing.

3. MJK Memorial

3.1. More pictures sorted

4. Santa Cruz short fence

4.1. Disassembled

4.2. Posts replaced

4.3. Frame reassembled

5. EPLDH

5.1. Investigating quadratic field sqrt(3) integers and rationals.

6. Compilers

6.1. Started hand written WSN parser

7. Mill Controller #2

7.1. Mounted on mill - ready or testing

7.2. Need to investigate new HW/SW for eventual replacements

7.2.1. Old crap ain't gonna last forever

7.2.2. Buildroot/Linux 5.15 PREEMPT + latency tools

First pass done - boots on real hardware

7.3. Alternative architecture

7.3.1. Split off stepper motor controller to separate board

Increase latency tolerance on controller

7.3.2. Use emc2 MODBUS/TCP protocol for stepper and other IO

8. Alum Rock Data Center

8.1. need to check rocky, others? (arch?) for suitability

8.2. recheck ALMA, now that CERN and Fermilab are using it

8.3. Sonic.net has announced that Fiber connectivity is coming to my house

8.4. 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.

8.5. Need a VPS with static IP

8.5.1. OpenVPN to tie it all together

8.5.2. Gandi VPS datacenter in France so connection crosses international border

What are the data security and privacy tradeoffs?

8.5.3. Prototype VPS on existing hardware

9. CA Root Key Generation

Nice to have an appliance that manages keys. Could just buy something from nitrokey https://www.nitrokey.com/

9.1. 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?

9.2. Simple hardware.

9.3. 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.

9.4. Use Sneakernet

Using "disk drive" IO introduces air gap - remote access impossible. Increases attack surface via filesystem manipulation.

9.5. Beagleboard

Found in SCZ. Thought it was in SJ.

9.6. LCD Touchscreen

Unlocks encrypted filesystem. Maybe not needed. See below.

9.7. 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?

9.8. Encrypted Filesystem

10. Virtual Orchestra

10.1. sfz file tests

10.1.1. need tooling to edit sample files

10.2. increasingly skeptical whether quality results are possible

10.3. maybe should treat as platform for concatinative synthesis

10.4. maybe should just accept the limitations and work with it

One should not be disappointed that a guitar can't sound like a flute.

11. gat

11.1. spectrogram done - matches 'octave' output

12. RIOT drivers

Implemented - needs testing.

12.1. WS2801

12.2. Velleman KA03

12.3. Velleman KA05

13. mcd05 32 button/led box

13.1. Recovered schematics.

13.2. Planning software.

13.3. Received STM32F767 Nucleo144 with Ethernet.

13.3.1. Test program running.

13.3.2. Need to consider CoAP multicast discovery.

13.3.3. Consider simpler architecture with STM32F767 as a 'hub'.

13.3.4. Consider CAN interface to hub.

14. AMD 2900 bitslice computing

14.1. Probably my oldest uncompleted project

14.2. Exploring possibilities for something constructive

Create verilog models for 2903/2910 and verify against hardware?

15. Hitachi HD68B09E CPU

15.1. RAM/UART/IO

15.2. Started schematic

15.2.1. Standard peripheral set for 8 bit CPU bringups

Board schematic planned - need Kicad symbols

15.3. Arduino Mega 2560 DMA loader

…Along with standard 8 bit loader

15.4. Generate quadrature clock directly

15.5. Full Bus SW Emulation infeasible

6809 1000ns maximum cycle time too short

16. Rockwell R65F11

16.1. Still evaluating.

16.2. 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.

17. 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.

18. EPROM Programming

Found some software for Needham programmer. Need to check electrolytic caps on ISA board.

19. POSIT

Use POSITs for YRX?

20. MAME

20.1. Subset builds in debug mode

Full debug fails - not enough disk or memory.

20.2. gs6809 serial IO doesn't work right with PTY and other streams

20.3. ampro (Z80/Z80SIO) does work with PTY

20.4. Evaluating what is needed for other emulators.

21. More project ideas

21.1. Zuse Z3 simulation in Verilog

Good excuse for floating point ALU design. Try posit format?

21.2. GMPForth ports to simulators

21.2.1. SIMH for some targets (vax)

21.2.2. MAME looks interesting for microprocessor system emulations

How to support ersatz systems?

21.2.3. Ports to classic figFORTH targets

21.3. GMPASM assembler

May be useful for handbuilt and rare systems (DMX1000?).

21.4. Extracting ISO Superboard Forth ROMS for MAME emulation

21.5. 'bwocl' OpenCL tooling

21.5.1. Offline compilation

21.5.2. Standard Kernel Running

21.6. hardware support for classic 5V CPUs

21.6.1. RTX2000, CDP1802 still available!

21.6.2. 6502, 68000, 320C30, others on hand

21.6.3. CPUs with totally async bus may be supportable without RAM

21.6.4. Could use small footprint monitor in asm (gmpmon?)

21.7. Existing 'retro' hardware still working?

21.7.1. OSI Superboard

Unknown. Composite to VGA adapter didn't seem to work. Needs analysis. Found OSI model 610 board underneath!

21.7.2. Super Jolt

No output. Needs analysis.

21.7.3. Ampro Little Board

Not booting. Needs analysis.

21.7.4. Rockwell R65F11 Demo board

UART sending "NO ROM" at 2400 7N1 as expected with 2MHz xtal. MAME emulator possibilities?