11 May 2024 - 17 May 2024

Table of Contents

1. MIT OCW

1.1. 18.06sc (Linear Algebra)

1.1.1. Unit II: Orthogonal Matrices and Gram-Schmidt

2. SJ grounds

Mowing

3. Prado fence

Helped patch corner that fell apart.

4. SCZ Front Step

4.1. Identified piece of chactacote that should work for door sill

5. Jointer

Rewiring Done.

6. gaiasky

6.1. broken from arch updates (or something…)

6.2. HDF stuff continuing

Memory problems addressed.

7. Andromeda Path analysis

7.1. Initial path complete.

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

7.2.1. Distance modulus data more or less matches

7.2.2. Studying refinement of DR3 parallax conversion

A lot more complicated!

8. into the west

Done

9. steel-pan lilypond

Recent lilypond broke steel-pan notation. Fixed shake-and-stomp as a prototype solution. May need to find an approach that is less brittle.

10. tbattery

(Old news). Wrote battery status monitor for FVWM integration based on tclock in February.

11. ca-r

Data no longer being updated, so weekly builds are stopped.

12. xz compromise

Kaveri updated.

13. 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.

13.1. First pass done

13.1.1. 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.

13.1.2. 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.

13.2. 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?

13.3. Simple hardware.

13.3.1. Use beagleboard with local interface

13.3.2. Use some modern device TPM

Need to export data for backup.

13.3.3. Or something that uses PKCS11 interface

13.4. 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.

13.5. Use Sneakernet

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

14. Compilers

14.1. Compiled Wikipedia PL/0 example

14.2. Work out overall plan.

Lots of moving pieces.

14.3. Looking into LLVM MLIR.

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

14.4. ASDL

14.4.1. current smlnj C++ implementation incomplete

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

14.4.3. old versions of smlnj not easily buildable on x8664

14.4.4. ancient binary of asdl 1.2 compiler seems to work

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

14.4.5. 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.

14.4.6. 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.

15. Piper dovecot

15.1. Update broke dovecot auth.

Looks PAM related, but PAM update failed to fix.

15.2. Set tuffy up as a staging server

So I don't debug on 'production'.

15.3. piper dovecot SSL certificate NOT broken

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

16. Various i686

16.0.1. netbsd

was installed. But needed the box for something else.

16.0.2. buildroot

builds complete.

17. piper

17.1. dovecot

17.1.1. Raising apparmor error.

Not sure how to resolve.

17.2. pidgeonhole

17.2.1. procmail replacement.

17.2.2. Considering integration.

17.3. httpd

17.3.1. Still stable.

But seems to occassionally mis-serve files.

17.4. SSL cert

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

17.5. redmine

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

17.6. openvpn

Need to consider cert construction.

18. Buffalo WZR-HP-G300NH

18.1. Update

Sometime next year.

19. SJC weather station

19.1. Proper enclosure mostly constructed

19.1.1. Needs a redo on bottom plate

19.1.2. Seems to have improved wireless connectivity somewhat

20. opencl

20.1. Studying. Have some examples working.

20.2. Need to look at arrayfire as an alternative.

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

21. EPLDH

21.1. MPFI interval arithmetic better alternative

22. wktpqb

22.1. needs a new approach

22.2. Verifying edge construction (con't.)

22.3. 'gcd' algorithm doesn't work

23. Mill Controller #2

23.1. Mounted on mill - ready or testing

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

23.2.1. Old crap ain't gonna last forever

23.2.2. Buildroot/Linux 5.15 PREEMPT + latency tools

First pass done - boots on real hardware

23.3. Alternative architecture

23.3.1. Split off stepper motor controller to separate board

Increase latency tolerance on controller

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

24. Alum Rock Data Center

24.1. May have problem with network power module.

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

24.2. Added Ethernet card to tuffy

Preparing as backup/staging server.

24.3. Need a VPS with static IP

Just use dynamic interface to bind.

25. Virtual Orchestra

25.1. sfz file tests

25.1.1. need tooling to edit sample files

25.2. increasingly skeptical whether quality results are possible

25.3. maybe should treat as platform for concatinative synthesis

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

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

26. gat

26.1. spectrogram done - matches 'octave' output

27. RIOT drivers

Implemented - needs testing.

27.1. WS2801

27.2. Velleman KA03

27.3. Velleman KA05

28. mcd05 32 button/led box

28.1. Recovered schematics.

28.2. Planning software.

28.3. Received STM32F767 Nucleo144 with Ethernet.

28.3.1. Test program running.

28.3.2. Need to consider CoAP multicast discovery.

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

28.3.4. Consider CAN interface to hub.

29. AMD 2900 bitslice computing

29.1. Probably my oldest uncompleted project

29.2. Exploring possibilities for something constructive

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

30. Hitachi HD68B09E CPU

30.1. RAM/UART/IO

30.2. Started schematic

30.2.1. Standard peripheral set for 8 bit CPU bringups

Board schematic planned - need Kicad symbols

30.3. Arduino Mega 2560 DMA loader

…Along with standard 8 bit loader

30.4. Generate quadrature clock directly

30.5. Full Bus SW Emulation infeasible

6809 1000ns maximum cycle time too short

31. Rockwell R65F11

31.1. Still evaluating.

31.2. 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.

32. 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.

33. EPROM Programming

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

34. POSIT

34.1. Use POSITs for YRX?

No. Existing library is fine.

35. MAME

35.1. Subset builds in debug mode

Full debug fails - not enough disk or memory.

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

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

35.4. Evaluating what is needed for other emulators.

36. More project ideas

36.1. Zuse Z3 simulation in Verilog

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

36.2. GMPForth ports to simulators

36.2.1. SIMH for some targets (vax)

36.2.2. MAME looks interesting for microprocessor system emulations

How to support ersatz systems?

36.2.3. Ports to classic figFORTH targets

36.3. GMPASM assembler

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

36.4. Extracting ISO Superboard Forth ROMS for MAME emulation

36.5. 'bwocl' OpenCL tooling

36.5.1. Offline compilation

36.5.2. Standard Kernel Running

36.6. hardware support for classic 5V CPUs

36.6.1. RTX2000, CDP1802 still available!

36.6.2. 6502, 68000, 320C30, others on hand

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

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

36.7. Existing 'retro' hardware still working?

36.7.1. OSI Superboard

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

36.7.2. Super Jolt

No output. Needs analysis.

36.7.3. Ampro Little Board

Not booting. Needs analysis.

36.7.4. Rockwell R65F11 Demo board

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

36.7.5. NMIX-0016

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

37. David Davies

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

37.2. New case C1923172, consolidated with 15 Parties.

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

Author: Daniel Kelley

Created: 2024-05-25 Sat 06:52

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