I stumbled upon a very interesting device. It is a serial interface unit, or SIU. It is manufactured by FSR, Inc. which is still around today. It was marketed by York Telecom Corporation. Based on the chips, it was built around 1993 to 1994. I tried the usual Google search tricks, but can't find anything about this device.

It is a rack mountable device, takes up 1U in a rack. I believe this is some sort of controller that can turn on and off a variety of devices. It has four infrared outputs, two serial interfaces (controlled by MAX232,) three sets of relay outputs, and a unidentifiable "EZ-NET" interface that have RJ-11 jacks. The main controller is a Motorola HC11, and has a 65C52 processor.

I've tried connecting both serial ports to a PC, but I can't get anything to output when I power on the unit.

Any information that can lead to finding documentation on this device would be great!

Well, I can't really tell you too much about it, however:

- The R65C52 is a dual async controller, basically, two 65C51 UARTs in a single DIP. You might want to probe the clock signal and perhaps look at the crystal frequency which I suspect is going through the 74HC74 flip-flop as a divider. This might help you determine the baud rates which are possible.

- The MC68HC711 is still made by NXP, so obtaining a datasheet for that is pretty easy. It appears to the main controller and there's a ROM to the right of it. As it's a 28-pin ROM, I suspect it could be upwards of 64KB.

- The MC68HC24 is a port expander... I found a datasheet for this. It simply adds additional parallel ports. It appears it's used to drive the additional outputs on the far right of the board via the ULN2803 which are darlington transistor solenoid drivers.

Also onboard is a 2KB static RAM (LH5116), an 8-bit DAC (AD7224), a VCO (LM566) and some other interesting bits.

I would say it's an interesting find... wish I could find out more about it.

_________________
Regards, KM
https://github.com/floobydust

The 65C52 isn't a CPU of any kind - it's a dual-port serial interface known as the DACIA, a close cousin of the (now infamous) 6551, but no obvious relation to the Romanian car manufacturer.

Looking through the 6502.org document archive, I quickly found this datasheet.

The rest of the board is a little off-topic for this forum, but there is anycpu.org…

This discontinued product from FSR has similarities
ftp://doclib.fsrinc.com/DISCONTINUED_PR ... 0Sheet.pdf

DESCRIPTION: The UIR-16 was developed to provide a means to control any device that has an infrared remote control. Examples include, but are not limited to, video tape decks, audio tape decks, video switchers, video projectors, and monitors.The UIR-16 has the infrared training circuitry built in, providing a quick and easy way to program the unit on site. Pluggable infrared output cables are used to couple the UIR-16 to the controlled equipment.There are four outputs permitting one UIR-16 to control up to four devices. Since the outputs are independent and the trained codes may be assigned to any output, the UIR-16 will allow control of four identical devices, without interaction.
• Compatible with FSR EZ-Net