22 June 2024 - 28 June 2024

Table of Contents

1. MIT OCW

1.1. 18.06sc (Linear Algebra)

1.1.1. Unit II: Differential Equations and exp(At)

2. SJ grounds

Too Hot!

3. SCZ Front Step

3.1. Test piece right side fitting continues

3.2. Target piece roughed out to width; bevel cut

4. Andromeda Path analysis

4.1. Initial path complete.

4.2. Continuing "fun" reconciling EDD catalog with GAIA DR3

4.2.1. Distance modulus data more or less matches

4.2.2. Studying refinement of DR3 parallax conversion

A lot more complicated! Gaiasky has bayesian path database.

4.2.3. Initial "two step path" to M31

Now it's a physics problem of whether any constructed artifact can traverse 700 kiloparsecs.

5. John Ralston

Ralston Family plot is the first next to the road on the south end.

6. Spacewire-like PHY

Poking that this long-standing problem. Building infrastructure to test if it's possible to construct a PHY layer with acceptable BER to 50 MBit which should be sufficient for 32 16-bit channels at 48 KHz sample rate. Need to re-establish EDA workflow.

7. EDA workflow

7.1. kicad

Spacewire-like PHY with LVDS and XOR gates.

7.2. FPGA programming

7.2.1. lattice workfow refinement (testbenches)

7.2.2. simple interconnect circuit tested

7.2.3. simple SPI client to 8 bit wishbone bus in development

Passes testbench

7.3. RIOS OS

7.3.1. Nucleo boards build fine

7.3.2. Arduino Uno builds fine

7.3.3. Some difficulty getting SPI on F767ZI to work but now resolved

8. CA Root Key Generation

Nice to have an appliance that manages keys. Need to make this simple. Really don't have time for a science project. Too, bad, though. It kind of is a science project. Could just buy something from nitrokey https://www.nitrokey.com/ but I really don't want to spend money on it of I have hardware already. Looking at nitrokey in more detail, it doesn't seem to be any simpler than what I'm doing already.

8.1. First pass done

8.1.1. Based on https://pki-tutorial.readthedocs.io/en/latest/simple/

Interesting that the certs generated fail with openssl sserver testing because the cryptographic algorithms are too weak.

8.1.2. Work continues

  1. Have an outline with ECDSA/NIST-384
  2. Have consolidated configuration across CAs.
  3. Trying to decide if/how to deal with revocation. What a PITA.

8.2. 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?

8.3. Simple hardware.

8.3.1. Use beagleboard with local interface

8.3.2. Use some modern device TPM

Need to export data for backup.

8.3.3. Or something that uses PKCS11 interface

8.4. 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.

8.5. Use Sneakernet

Doesn't scale. Should use something so cert updates are automatable. But that's a science project it seems.

9. Compilers

9.1. Compiled Wikipedia PL/0 example

9.2. Work out overall plan.

Lots of moving pieces.

9.3. Looking into LLVM MLIR.

Will not use immediately, but perhaps trend in that direction.

9.4. ASDL

9.4.1. current smlnj C++ implementation incomplete

9.4.2. old versions asdl source fail to build with new versions of smlnj

9.4.3. old versions of smlnj not easily buildable on x8664

9.4.4. ancient binary of asdl 1.2 compiler seems to work

but associated libraries are to old to link because of missing ctype symbol

9.4.5. analyzing asdl 1.2 generated code

Most of the code is for serialization, which is going to be replaced anyway, so can be removed by hand.

9.4.6. run in vm?

Analysis of binaries shows that it was built on some redhat os using gcc 2.8.1. Redhat-6.2? No. Tried various ancient Redhat OSs.

10. Piper dovecot

10.1. Update broke dovecot auth.

Looks PAM related, but PAM update failed to fix.

10.2. Set tuffy up as a staging server

So I don't debug on 'production'.

10.3. piper dovecot SSL certificate NOT broken

At least not obviously broken (yet). Further investigation needed.

11. Various i686

11.0.1. netbsd

was installed. But needed the box for something else.

11.0.2. buildroot

builds complete.

12. piper

12.1. dovecot

12.1.1. Raising apparmor error.

Not sure how to resolve.

12.2. pidgeonhole

12.2.1. procmail replacement.

12.2.2. Considering integration.

12.3. httpd

12.3.1. Still stable.

But seems to occassionally mis-serve files.

12.4. SSL cert

Trying letsencrypt with certbot. http problem above may be interfering.

12.5. redmine

Still not sure I want to go down this rabbit hole.

12.6. openvpn

Need to consider cert construction.

13. Buffalo WZR-HP-G300NH

13.1. Update

Sometime next year.

14. SJC weather station

14.1. Proper enclosure mostly constructed

14.1.1. Needs a redo on bottom plate

14.1.2. Seems to have improved wireless connectivity somewhat

15. opencl

15.1. Studying. Have some examples working.

15.2. Need to look at arrayfire as an alternative.

15.3. This is a bit of a hammer looking for a nail.

16. EPLDH

16.1. MPFI interval arithmetic better alternative

17. wktpqb

17.1. needs a new approach

17.2. Verifying edge construction (con't.)

17.3. 'gcd' algorithm doesn't work

18. Mill Controller #2

18.1. Mounted on mill - ready or testing

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

18.2.1. Old crap ain't gonna last forever

18.2.2. Buildroot/Linux 5.15 PREEMPT + latency tools

First pass done - boots on real hardware

18.3. Alternative architecture

18.3.1. Split off stepper motor controller to separate board

Increase latency tolerance on controller

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

19. Alum Rock Data Center

19.1. May have problem with network power module.

It's only 30 years old or something like that.

19.2. Added Ethernet card to tuffy

Preparing as backup/staging server.

19.3. Need a VPS with static IP

Just use dynamic interface to bind.

20. Virtual Orchestra

20.1. sfz file tests

20.1.1. need tooling to edit sample files

20.2. increasingly skeptical whether quality results are possible

20.3. maybe should treat as platform for concatinative synthesis

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

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

21. gat

21.1. spectrogram done - matches 'octave' output

22. RIOT drivers

Implemented - needs testing.

22.1. WS2801

22.2. Velleman KA03

22.3. Velleman KA05

23. mcd05 32 button/led box

23.1. Recovered schematics.

23.2. Planning software.

23.3. Received STM32F767 Nucleo144 with Ethernet.

23.3.1. Test program running.

23.3.2. Need to consider CoAP multicast discovery.

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

23.3.4. Consider CAN interface to hub.

24. AMD 2900 bitslice computing

24.1. Probably my oldest uncompleted project

24.2. Exploring possibilities for something constructive

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

25. Hitachi HD68B09E CPU

25.1. RAM/UART/IO

25.2. Started schematic

25.2.1. Standard peripheral set for 8 bit CPU bringups

Board schematic planned - need Kicad symbols

25.3. Arduino Mega 2560 DMA loader

…Along with standard 8 bit loader

25.4. Generate quadrature clock directly

25.5. Full Bus SW Emulation infeasible

6809 1000ns maximum cycle time too short

26. Rockwell R65F11

26.1. Still evaluating.

26.2. 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.

27. 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.

28. EPROM Programming

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

29. POSIT

29.1. Use POSITs for YRX?

No. Existing library is fine.

30. MAME

30.1. Subset builds in debug mode

Full debug fails - not enough disk or memory.

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

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

30.4. Evaluating what is needed for other emulators.

31. More project ideas

31.1. Zuse Z3 simulation in Verilog

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

31.2. GMPForth ports to simulators

31.2.1. SIMH for some targets (vax)

31.2.2. MAME looks interesting for microprocessor system emulations

How to support ersatz systems?

31.2.3. Ports to classic figFORTH targets

31.3. GMPASM assembler

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

31.4. Extracting ISO Superboard Forth ROMS for MAME emulation

31.5. 'bwocl' OpenCL tooling

31.5.1. Offline compilation

31.5.2. Standard Kernel Running

31.6. hardware support for classic 5V CPUs

31.6.1. RTX2000, CDP1802 still available!

31.6.2. 6502, 68000, 320C30, others on hand

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

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

31.7. Existing 'retro' hardware still working?

31.7.1. OSI Superboard

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

31.7.2. Super Jolt

No output. Needs analysis.

31.7.3. Ampro Little Board

Not booting. Needs analysis.

31.7.4. Rockwell R65F11 Demo board

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

31.7.5. NMIX-0016

Works. Found original prom in a parts stash(!).

32. David Davies

32.1. Broadcom (BCG?) Employee indicted for running a brothel.

32.2. New case C1923172, consolidated with 15 Parties.

32.3. Court website no longer allows seaching (grrr!)

Author: Daniel Kelley

Created: 2024-07-06 Sat 07:05

Validate