Some of the exhibits at the Festival
(Click on a picture for a larger version.)
Every imaginable type of floppy disk from 2.5" to 120 MB!
Digi-Comp II recreation.
MOnSter 6502, running a game. It is a transistor-for-transistor working replica of the 6502 microprocessor, and was reverse-engineered from the actual die. Due to the gate capacitance of the discrete MOSFET transistors, it only runs at 60 kHz.
A close-up of the MOnSter 6502.
Anyone need spare parts for a PDP-8?
BlinkenBone: Program a PDP-11/70 over a reanimated front panel.
This was my booth.
A PDF copy of my poster is here. It explains what my display was all about.
The complete festival program is here.
I had several very enjoyable conversations about my floppy disk reader project at the festival.
As of today (2018-Jun-29) I have already imaged 130 of my old 5.25" floppy disks. Most of them captured with zero read errors! Of the rest, after cleaning the drive heads, re-reading the tracks that had errors, and tweaking the software digital PLL decoding coefficients used in the post-processing software, all remaining errors were eliminated! Not bad for disks that are 25-37 years old!
So far the analog signal recording hasn't been needed for "fixing" read errors. It has been interesting to see how the signal amplitude sometimes varies significantly, yet the drive is still able to successfully extract all the pulses.
Now I have started the process to analyze and organize the files read from the floppy disks, and create web pages to document my old projects.
Some of the museum's computers on display. Many are available for the public to play with.
Cray 1. This unit is not functional. (But they have a Cray 2 waiting for restoration.)
Wiring of the Cray 1 -- looks like a rats nest!
DEC PDP8/e system.
Control Data 6600 Supercomputer.
Xerox Sigma 9.
IBM 029 Keypunch. I punched thousands of cards on a machine like this at B.C.I.T.
DEC PDP-7 computer.
Jeff using the Xerox Alto, the world's first modern personal computer.
Kenbak-1 computer (TTL, serial memory), SCELBI-8H 8008 computer, homebrew Intel 4004 board.
On Sunday morning before the museum was open to the public, Cynde, the museum's Collections Manager, gave some of us a tour of their huge basement storage area and restoration work areas. These pictures show only a very tiny portion of what we saw. Fascinating!
I think these are LGP-30 vacuum tube computers.
IBM 711 punch card reader.
Card cages with lots of cards.
Neat wiring, but very dense!
In need of lots of TLC.
Data General Eclipse minicomputer?
Rows and rows of disk drives.
Lots of spare chips.
Rows and rows of tapes.
Shelf after shelf of microcomputers of every description.
HP 2100S minicomputer. Similar to the HP 2100A I used at B.C.I.T. 1974-1976.
Large (in size, not capacity) hard disk drive.
Restoration work area.