STD206

STD206

Highlights

Description

The MICRO-LINK STD206 is a general purpose STD Bus computer built around the powerful 80188 16-bit CPU. Although it uses the 80188 8 MHz clock, the card is fully compatible with the 4 MHz STD-Z80 bus. With a large on-board capacity for both EPROM and RAM, the card accesses its on-board RAM without wait states to provide faster operation than is normally possible over the STD Bus. The board also provides a wide range of I/O and peripherals, including dual DMA channels, three counter/timers, two serial ports, a parallel port with DMA, and a multi-source interrupt controller. The card supports Z80 vectored interrupts and the Z80 return for interrupt opcodes. The 80188 interrupt controller can provide vectors and prioritization for all or some of the on- and off-board interrupts.

General Operation

The STD206 contains 256K of dynamic RAM with parity bit logic; a parity error will generate a non-maskable interrupt to the CPU. The lowest 64K on the on-board dynamic RAM may be accessed by an external DMA controller, such as a disk controller card. Providing access to the full 1 MByte addressing range, the 80188 dual DMA controller may be used to transfer data between memory and I/O. In addition to the on-board dynamic RAM, the card can accommodate two 24- or 28-pin EPROMS (up to 64K each) or one EPROM and one static RAM device. The normal STD Bus addressing range of 64K is expanded to 1 MByte by multiplexing the upper address bits onto the data bus during the first part of each cycle.nbsp The STD MEMEX signal may be used to switch between standard 64K addressing and extended 1 MByte addressing. The card contains the powerful 8530 serial communications controller to provide two serial I/O channels. This chip supports multiple protocols, including asynchronous, SDLC, HDLC, X.25, Bisync, and Monosync. One channel is configured as a full sync/async RS232C DCE port. The second channel may be used as either a second RS232C channel or an RS422 channel. As an RS422 the channel is suitable for multi-drop or point-to-point networks. The transmitter and receiver on both channels may be connected to the 80188 DMA controller. An SBX I/O connector on the card allows the user to expand the card's I/O capability by selecting an expansion board from a wide range of standard products. The STD206 also contains a parallel I/O port, which provides access to the 80188 DMA, counter/timers, and interrupts, as well as providing an 8-bit buffered/latched I/O port. This port may be configured as a parallel printer interface. A four channel counter/timer controller (CTC) allows for software controlled timing functions. A jumper set is provided to allow the user to cascade the CTC channels for extended timing functions.

Specifications

Physical Dimensions

Power Requirements

Environmental

Ordering Information

Product Number: Contact MICRO-LINK for all of the STD206 Options

Accessories: