S100 CPU Replacement Board For ALTAIR 8800 IMSAI 8080 JAIR Single Board Computer
Item History & Price
| Reference Number: Avaluer:7064209 |
This S100 board is designed to be a complete system replacement for your ALTAIR 8800 or IMSAI 8080 computer.
It will interface with the front panel of either computer (includes the Molex and 16 pin DIP socket).
It has ROM, RAM, serial ports, parallel ports and an SD card that can boot CP/M.
Uses the 8080 CPU at 2Mhz.
It can be used as a tool to help trouble shoot and test your other S100 boards. The RAM, I/O and CPU can be disabled.
eg. Disable the CPU ...to use board as Memory and I/O only, then test your CPU board with it.
or Disable a block of RAM and test your own RAM boards.
The board can even be configured as a stand alone computer, the extra holes allow 4 stand offs and a header accepts power (3 voltages).
The S100 connector can be ignored.
Features:
32K ROM, switchable in/out
64K RAM, can be disabled in blocks of 8K (or less using Phantom line) to allow access to your RAM or RAM mapped I/O on the S-100 bus.
Two serial ports, complete with 24" ribbon cables that terminate to DB9M.
Two parallel ports
One SD Card (FAT-16) to load programs and emulate CP/M Floppy disks
CPU can be disabled
S100 bus gold plated
Includes a complete manual with schematic and source code files for the ROM, BIOS and CP/M BIOS. An unlicensed copy of CP/M 2.2 is included on the SD Card files, while this software is considered to be in the public domain, it is your responsibility to get a licensed copy if necessary.
Will ship with latest firmware.
Board is a mix of new, new old stock and used chips. 100% tested.
All chips are 74LSxx type, no PAL's, no GAL's, no modern processors emulating.
All chips (except voltage regulators) are socketed.
All chips (except 5V regulator) are through hole.
SD Card interface is through a 4 chip 74LSxxx circuit that creates SPI.
Hand soldered, cleaned. 1200+ solder points.
Given the chip count and density of this board, a DC-DC converter is used in place of the 7805CK regulator to reduce heat.
Listing includes: Board as shown, SD Card (loaded with data above), 2 ribbon cables for the serial ports.
More info on board is available on the internet at S100computers.
It will interface with the front panel of either computer (includes the Molex and 16 pin DIP socket).
It has ROM, RAM, serial ports, parallel ports and an SD card that can boot CP/M.
Uses the 8080 CPU at 2Mhz.
It can be used as a tool to help trouble shoot and test your other S100 boards. The RAM, I/O and CPU can be disabled.
eg. Disable the CPU ...to use board as Memory and I/O only, then test your CPU board with it.
or Disable a block of RAM and test your own RAM boards.
The board can even be configured as a stand alone computer, the extra holes allow 4 stand offs and a header accepts power (3 voltages).
The S100 connector can be ignored.
Features:
32K ROM, switchable in/out
64K RAM, can be disabled in blocks of 8K (or less using Phantom line) to allow access to your RAM or RAM mapped I/O on the S-100 bus.
Two serial ports, complete with 24" ribbon cables that terminate to DB9M.
Two parallel ports
One SD Card (FAT-16) to load programs and emulate CP/M Floppy disks
CPU can be disabled
S100 bus gold plated
Includes a complete manual with schematic and source code files for the ROM, BIOS and CP/M BIOS. An unlicensed copy of CP/M 2.2 is included on the SD Card files, while this software is considered to be in the public domain, it is your responsibility to get a licensed copy if necessary.
Will ship with latest firmware.
Board is a mix of new, new old stock and used chips. 100% tested.
All chips are 74LSxx type, no PAL's, no GAL's, no modern processors emulating.
All chips (except voltage regulators) are socketed.
All chips (except 5V regulator) are through hole.
SD Card interface is through a 4 chip 74LSxxx circuit that creates SPI.
Hand soldered, cleaned. 1200+ solder points.
Given the chip count and density of this board, a DC-DC converter is used in place of the 7805CK regulator to reduce heat.
Listing includes: Board as shown, SD Card (loaded with data above), 2 ribbon cables for the serial ports.
More info on board is available on the internet at S100computers.
