GE IS200TBTCH1BAA IS200TBTCH1BBB THERMOCOUPLE TERMINAL BOARD

Description

GE General Electric Technical Specifications: IS200TBTCH1BAA

As microcomputer systems have increased in their

IS200TBTCH1BAA complexity, so have their mass storage needs also

increased. It isn’t uncommon to see as much as 10 MB of

mass storage attached to an 8-bit microcomputer. Mostek

has responded to this need with the introduction of the

MDX-SASI-1: a Shugart Associates System Interface

(SASITM) bus adapter for the STD-Z80 BUS.

This application note will highlight the features of the SASI

bus as well as provide a fairly comprehensive list of the

IS200TBTCH1BAA controllers and disk drives which are compatible with the

MDX-SASI-1. There will also be a brief discussion of the

versions of M/OS-80 which are designed to utilize the

capabilities of a hard disk. For more in-depth coverage, the

reader should refer to the references listed atthe end ofthis

Application Note.

The Shugart Associates System Interface is an asynchro

nous, parallel bus designed to allow efficient transfer of data

between IS200TBTCH1BAA computers and input/output devices. Due to its

asynchronous nature, SASI allows speed independent

communications. In general. SASI is oriented towards

intelligent I/O devices.

Bus Ports are the lowest level of interface for a SASI system.

There may be a maximum of 8 bus ports for a given SASI

IS200TBTCH1BAA bus. Attached to the bus ports are bus devices which are in

turn attached to the peripheral devices. A 50-pin flat ribbon

cable connects the bus devices. There are 9 data lines and 9

control lines. Each of the 18 lines has a ground trace

between it and adjacent traces to reduce noise sensitivity.

The other traces are reserved for future use. During a

communication session one bus device must be the initiator

and the other must be the target. Initiators are those bus

devices which start an operation on the bus while targets

are those bus devices which perform the operation. A bus

device may have a fixed role as an initiator or target, or the

bus device may be able to assume either role.

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