The alphanumeric display, 32×8 characters, 5×7 pixels each plus underline bar

The display shows a nice glow-lamp orange color when forced on using the crocodile clamp contact

Okaya Rodan plasma display

32×8 characters, PCB silkscreen label M-0067-3 and M-0066-1

See schematic below, incomplete. The display is fed by +5 V and +162 V which is 115 V × √2. A voltage doubler is onboard. The power consumption is 370 mA at 5 V and 13 mA at 162 V, thus about 4 W.

The zip archive below contains the schematic as .png (pixel graphics) and .wmf (scalable vector graphics). But best is opening the schematic source file with Eagle layout editor so you are able to highlight particular nets and wires.

The M-0066-1 seems to expect a nearly-CRT signaling with serial pixel data and horizontal and vertical blanking gaps, serialized in columns, then in rows. (Think the display rotated by 90 degrees clockwise, and then think you have a standard cathode ray tube with beam deflected from left to right, then downwards.)

And the M-0067-3 is the accompanying „graphics card“ with 256 byte memory for the 32×8 plain (7-bit) ASCII characters (from a character generator ROM) plus 1 bit underline attribute.

The detected schematic for the picture generator (1977 × 1563 pixels).

Microcontroller interface

Currently, I have no active microcontroller project to control this display, sorry. A USB device with HID page 0x14 („Alphanumeric Display“) would fit perfectly. See HID usage tables page 108 ff. A good candidate for a V-USB based ATmega8 solution. Like this here:
Eagle CAD data for USB adapter


Eagle source