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Ex Cosmacar.


Destinado a realizar servicio de traslado de trabajadores del campo. (Lorca, Murcia, España).

...Well, sort of....! RCA CDP1861 pixie output connected to a VGA LCD monitor using a "Gonbes XVGA Box" display standard converter marketed mainly for legacy industrial CNC units.

Running an 1802 machine code routine using EF1 sync (not interrupts) to display 36 characters from a message buffer.

Netronics ASCii Keyboard with "FastVid" board in its original heavy gauge metal "Big Blue" case. Supplied as a self-assembly kit for use with the Netronics ELFII (RCA COSMAC 1802) and Netronics Explorer kits c1978. Modded by addition of power & shiftlock LED indicators. I really must replace those clumsy brass bolts with something more discrete.

Running an 1802 machine code routine using EF1 sync (not interrupts) to display 36 characters from a message buffer.

STG COSMAC ELF 2000 with 256MB on compact flash, on a Wyse WY-120 display - so much better than a Windows PC terminal program!

Initial startup. Yay... it works. The wayward pink and white wires will eventually connect TP1-1 and TP2-1 from the ELF2K mainboard to the hex keypad. The CF/RTC/UART daughter board is yet to be installed. The 4 digit address and 2 digit data hexadecimal displays are legacy TIL311s.

A portable DVD player with a video input jack provided a handy test screen for ELF2K's vintage PIXIE (RCA1861) graphics chip output.

My 30+ year old 1802-based computer in a shiny new cabinet, with a keyboard from a Sanders 720 terminal. I have a full write-up on this machine at with photos of the boards. All boards were produced by the Association of Computer Experimenters, a Canadian computer club that published the Ipso Facto newsletter in the 70s and 80s.

Lee built this highly detailed model of the Galileo spacecraft from scratch. Inside is one of his CDP1802-based computers, blinking out the Arecibo message on an LED. See and for more information.

Retro switch panel input option for the ELF2K. The artwork was inkjet printed at 600 dpi on premium photo paper which was then protected by clear self adhesive vinyl film used to cover book jackets.

Work in progress on the HEX keypad. The generic 6425 push buttons & keytops get BECC self-adhesive vinyl lettering used by modellers. The key switches are mounted on conventional copper strip veroboard, with the IC sockets installed on Protoboard-3U.

Bill Rowe's Olduino marrying an ultrasonic range finder with an 1802! See Bill's site for much more information,

ELF2K has swapped its retro switch panel for a HEX keypad developed from STG's circuit schematics

Show in full swing

A DIL socket cut down to 2x12 pins provided the offset spacer and connection to the CF/RTC/UART daughterboard

The HEX keypad front panel with the LED driver daughter board in place. The fascia artwork was inkjet printed on premium glossy photo paper at 600 dpi then protected by clear self-adhesive vinyl film used to cover book jackets.

Credit Josh with most of the design, execution, and hardware shown at the COSMAC exhibit, telling the story of RCA's 1802 microprocessor.

Lee Hart's prototype of the 1802 Membership Card "retro-computing in a can"

The LED daughter board mounts behind the HEX keypad fascia board, locating each LED adjacent to its corresponding key.

Here is a front view of the 1802 Membership Card retro-computing in an Altoid can. The numbered switches are used to enter instructions and data. The switches and pushbutton on the left are used to control the state of the computer. The 'Q' and data LEDs are the only provided output. The parallel port and power connector round everything out.

Josh Bensadon created the VELF on the left, capable of acting as either an ELF or COSMAC VIP computer. The ELF2K on the right was assembled by me, with boards by Spare Time Gizmos.

Lee Hart offered his Membership Card kits (an ELF computer able to fit in an Altoids mint tin) and some beginner electronic kits for sale.

From Josh Bensadon's collection.

Josh Bensadon and Lee Hart manning the table.

This is either the guy who built a computer to fit in an Altoids tin, or a time machine out of a DeLorean...

Josh Bensadon and Lee Hart fielding questions.

From Josh Bensadon's collection.

Bill Rowe gave the backboard the nickname "death from above" from initial concerns about the stability of the frame and the weight of the sign. It held up great, though, with no casualties.

6502 Name Tag bare boards

Bill Rowe working on the COSMAC exhibit set up on Friday night.

Bill Rowe can be seen on the far right by the COSMAC exhibit.

Lee Hart and Josh Bensadon have been collaborating on a subminiature Z80 system. Lots of innovation, here!

In 1980-81 I designed and built a printer for Elf systems called the COSMAC IMP (Inexpensive Matrix Printer.) The thermal print head was a standard item on cash registers at the time. It was touchy to figure out (and it took me most of a year to do that) but it worked beautifully.

Lee Hart’s model of Galileo.

Cosmo in full color, at an SF con in 1978.

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