LisaList2

Here is what I got (2/10 2mb). Let me know if you want me to try other configurations or my FPGA.

FANTASTIC! Thank you very much!

I caught the "LOS software developer" fever from the community, and decided to complete a personal project that has been hanging unfinished for many years.

Here it is: https://github.com/TorZidan/LisaFileSystemTool/

I used elbow grease and AI to decode the LOS & Workshop file system format, by peeking into the LOS open source code, and via many trials and errors on many different disk image files.

Unlike previous attempts by others, everything is complete and well documented. Note: the "add file to a disk image" feature is experimental, works only with LOS 1.0  and 2.0 disk images, for now.

Section https://github.com/TorZidan/LisaFileSystemTool/#59-protected-files-theft-protection-and-removing-the-protection-deserialization (protected files) is particularly interesting.

UPDATE:  the "add file to a disk image" feature is fully implemented and works on all versions of the file system. It can add both binary and text files properly. Needs more testing....

I am really impressed with the PI coding harness and the Qwen 3.8 AI model running locally on my video card. It decoded the B-tree "add file" implementation from the Lisa OS sources (Pascal and 68k Assembly code) , came up on its own with ways to test the "addfile" functionality, by finding disk images on my PC if the necessary file system version, copying it into /tmp, adding a file to it, then dumping the file and comparing it with the original. It even found somehow the LisaEm binary on my PC and launched it, but got stuck at the boot screen.

Enjoy!

Quote from: sigma7 on September 19, 2026, 04:20:34 PMOh maybe you just did that... wait while I review

Most looks good.

Quote from: berskyboy on September 19, 2026, 03:31:55 PM

Quote from: sigma7 on September 19, 2026, 03:14:23 PMTest Q1 and Q2 again, out of circuit, use the diode test:

Q1
Red to Black
Lead 1 to Lead 2 0v
Lead 2 to Lead 1 OL

Check this again, if it is a short circuit, it should be bidirectional.

With Q1 and Q2 and CR18 still out of circuit, do these again using the diode test (we are looking for additional problems):

Diodes	Fwd, Rev	Description
{AA, AB}	0.46, inf	CR18, CR19
{CA, CB, CC, CD}	0.5, inf	CR1, CR2, CR3, CR4
{EA, EB}	0.38, inf	CR26, CR24
{FA, FB}	0.41, inf	CR22, CR21
.
Check the following again with the daughterboard removed:
Transistors
Red-Blk		Description
{3-2, 6-5}	inf	Q4, Q3 e-b

Oh maybe you just did that... wait while I review

Quote from: berskyboy on September 19, 2026, 03:31:55 PM

Quote from: sigma7 on September 19, 2026, 03:14:23 PMTest Q1 and Q2 again, out of circuit, use the diode test:

Q1
Red to Black
Lead 1 to Lead 2 0v
Lead 2 to Lead 1 OL

Check this again, if it is a short circuit, it should be bidirectional.

With Q1 and Q2 and CR18 still out of circuit, do these again using the diode test (we are looking for additional problems):

Diodes	Fwd, Rev	Description
{AA, AB}	0.46, inf	CR18, CR19
{BA, BB}	0.13, inf	CR20a, CR20b
{CA, CB, CC, CD}	0.5, inf	CR1, CR2, CR3, CR4
{DA, DB}	0.30, 0.37	CR25, CR23
{EA, EB}	0.38, inf	CR26, CR24
{FA, FB}	0.41, inf	CR22, CR21
.
Transistors
Red-Blk		Description
{1-2, 4-5}	1.25	Q4, Q3 c-b
{2-1, 5-4}	0.62	Q4, Q3 b-c
{1-3, 4-6}	0.70	Q4, Q3 c-e
{3-1, 6-4}	1.89	Q4, Q3 e-c
{2-3. 5-6}	0.64	Q4, Q3 b-e
{3-2, 6-5}	inf	Q4, Q3 e-b

Quote from: sigma7 on September 19, 2026, 03:14:23 PMTest Q1 and Q2 again, out of circuit, use the diode test and check all 6 permutations:

Red to Black
Lead 1 to Lead 2
Lead 2 to Lead 1
Lead 1 to case
case to Lead 1
Lead 2 to case
case to Lead 2

Q1
Red to Black
Lead 1 to Lead 2 0v
Lead 2 to Lead 1 OL
Lead 1 to case 0v
case to Lead 1 0v
Lead 2 to case 0v
case to Lead 2 0v

Q2
Red to Black
Lead 1 to Lead 2 0v
Lead 2 to Lead 1. 0v
Lead 1 to case 0v
case to Lead 1 0v
Lead 2 to case 0v
case to Lead 2 0v

Quote from: sigma7 on September 19, 2026, 05:20:40 AM

Diodes	Fwd, Rev	Description
{BA, BB}	0.13, inf	CR20a, CR20b
{DA, DB}	0.30, 0.37	CR25, CR23
.
Transistors	Red-Blk	Description
{1-2, 4-5}	1.25	Q4, Q3 c-b
{2-1, 5-4}	0.62	Q4, Q3 b-c
{1-3, 4-6}	0.70	Q4, Q3 c-e
{3-1, 6-4}	1.89	Q4, Q3 e-c
{2-3. 5-6}	0.64	Q4, Q3 b-e
{3-2, 6-5}	inf	Q4, Q3 e-b

And for each of Q1 and Q2 now out of circuit, also measure

Red to Black
Lead 1 to Lead 2
Lead 2 to Lead 1

Now my new measurements:


Diodes  Fwd, Rev            Description      My Measurement
{BA, BB}  0.13, inf  CR20a, CR20b      BA: 0.126, climbing BB: 0.126,climbinng
{DA, DB}  0.30, 0.37  CR25, CR23        DA: 0.26, 0.277 DB: 0.267, 0.260

Transistors    Red-Blk    Description. My Measurement:
{1-2, 4-5}    1.25    Q4, Q3 c-b.  0.775, 0.767
{2-1, 5-4}    0.62    Q4, Q3 b-c.  0.572, 0.566
{1-3, 4-6}    0.70    Q4, Q3 c-e.  0.661, 0.681
{3-1, 6-4}    1.89    Q4, Q3 e-c.  1.583, 1.585
{2-3. 5-6}    0.64    Q4, Q3 b-e.  0.612, 0.618
{3-2, 6-5}    inf    Q4, Q3 e-b.  1.712, 1.725

Q1
Red to Black       
Lead 1 to Lead 2.    0v       
Lead 2 to Lead 1      OL

Q2
Red to Black       
Lead 1 to Lead 2      0v
Lead 2 to Lead 1      0v

Quote from: berskyboy on September 19, 2026, 03:11:55 PMthank you for that

My pleasure.

Test Q1 and Q2 again, out of circuit, use the diode test and check all 6 permutations:

Red to Black
Lead 1 to Lead 2
Lead 2 to Lead 1
Lead 1 to case
case to Lead 1
Lead 2 to case
case to Lead 2

thank you for that

CR18 in diode mode
0.462V, OL