A FOX
Consulting & Design
Fox-Com
A MCS-51 Prototyping System




Some years ago we at A Fox Consulting & Design became involved with the Intel MCS-51 family of microcontrollers, specifically the 8051/52 and 8031/32, in an effort to understand the architecture of the MCS-51 line and experiment with interfacing it to various external circuitry.

The end result of these studies was a small line of prototype circuit boards we dubbed the "Fox-Com" System, the first board being the base or "motherboard" which held the CPU and main memory. From there we could add on various custom modules:

(Completed and assembled Fox-Com CPU/Memory board, part #FOX0000 09/00)
(Revised schematic for main CPU/Memory board, part #FOX0000 09/00)


Board Features
CPUIntel 8031 CPU clocked at 7.3728 Mhz.
Memory16 KBytes total via 2 x 8k sockets, addressed from 0x0000 to 0x3FFF
I/OBuilt-in DB9 RS-232 Serial Port
ExpansionFull array of I/O, power and logic available via 2 x 20 and 1 x 16 pin DIP sockets
Additional
Connectors
2-pin reset switch, 2-pin speaker, 2-pin 9VDC power


The first daughterboard that was developed was a basic display/keypad interface to facilitate basic programming and testing.

(Completed and assembled Fox-Com Display/Keypad daughterboard, part #FOX0001 09/00)


Board Features
Display16 character 5x7 dot-matrix LED display via two HDSP-21xx displays.
KeypadSupport for a 4 x 5 matrix keypad
I/O12 undedicated I/O lines via an Intel 8255 I/O controller


The second daughterboard that was developed has yet to leave the rough prototyping phase (as can be seen from the various ECOs). This is a mish-mash of various technologies we wanted to try out with the MCS-51. It includes a stepper motor driver, a better keypad interface, and an 8-bit A/D converter.

(In-house prototype for the Fox-Com Enhanced Display/Keypad Multi-function daughterboard, part #FOX0002 07/01)


Board Features
Display16 character 5x7 dot-matrix LED display via two HDSP-21xx displays.
KeypadSupport for a 4 x 5 matrix keypad using a 74LS923 keypad driver
Additional
Features
Bi-Polar Stepper Motor Driver (with inpit for 12VDC)
8-bit A/D Converter


The Fox-Com system is still only a functional prototype, but should further interest in the MCS-51 line warrent it, the system can be revitalized.

(The Fox-Com system as it stands, powered up and running.



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