JSimm Quad Serial is a JSimm/HSIO board with four hardware UARTs. The data and address path is over the HSIO bus from JStik. Each UART has a hardware interrupt on the JSimm bus. There are enough JSimm pins to support three JSQS boards in a single system. This is twelve hardware UARTs, plus you have the two on JStik for a total of fourteen. This is the most freqently-requested peripheral for JStik. Apparently, a lot of people want to build RS-232 to ethernet concentrators, programmable in Java. Here is your solution.. All four JSQS URATs can be RS232, and all are capable of 115 kbaud. One UART per JSQS can be RS485, and one can be IrDA. So you could have a system with three RS485, one IrDA, and eight RS232 ports.

Top view, showing the address range selection switch (red DIP switches), the HSIO bus connector (top left), and the various UART connectors (5x2 2mm headers).

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Bottom view with the legends describing the address range and interrupts selection, as well as identifying all the I/O connectors.

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