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Ships to:
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Ships to:
United States

Details about  COSMAC 1802 Homebrew Single Board Computer

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COSMAC 1802 Homebrew Single Board Computer
Item Sold
Item condition:
--not specified
Sep 01, 2013 18:00:45 PDT
Winning bid:
US $89.00
8 bids ]
Will ship to United States. Read item description or contact seller for shipping options. | See details
Item location:
Alexandria, Virginia, United States


eBay item number:
Seller assumes all responsibility for this listing.

COSMAC 1802 Homebrew Single Board Computer

Based on Spare Time Gizmos' Embedded Elf (with just a few modifications*), this homebrew single board computer features:

  • CDP1802 CPU
  • 32K EPROM
  • 32K battery backed up RAM
  • RS-232 Serial Port

The EPROM contains several distinct software modules, including:

  • A monitor written by Spare Time Gizmos which provides hardware diagnostics, program debugging and downloading features.
  • A VT52 terminal emulator for use with the Spare Time Gizmos VT1802 80 column video card.
  • A disk BIOS written by Mike Riley and compatible with the ElfOS disk operating system. In addition to booting ElfOS, the BIOS contains many useful functions that you can call from your own assembly language programs.
  • A simple text editor and a load-and-go assembler, written by Mike Riley, which allows you to type in, edit, assemble and then run 1802 assembly language programs.
  • A full featured BASIC interpreter, written by Mike Riley.
  • A Forth interpreter, also written by Mike Riley.

View a YouTube video of the SBC booting up and running a simple BASIC test program.

Requires a 5VDC regulated power supply (NOT included). NOTE: Using an unregulated power supply, or a power supply that outputs more than 5VDC will damage the SBC. I will not accept the SBC for return if it is damaged by use of an incorrect power supply.

Guaranteed fully functional.

Shipping by USPS Priority Mail.

*The schematic for the Spare Time Gizmos' Embedded Elf is here. This SBC does not have U6, DISP1, DISP2, U9, B1 and the expansion bus connector. The ATF22V10 (U7) has been replaced with an ATF16V8. The Dallas Semiconductor DS1230Y Nonvolatle RAM chip makes U9 and B1 unnecessary.

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