Qume DataTrak 8 Manual descargar pdf (Pagina 10)

SECTION 1 INTRODUCTION

SECTION 1

INTRODUCTION

1.1 SCOPE

This manual contains the complete hardware description of the

Jade Double Density Disk Controller. It provides the end user

with construction and configuration procedures, and a functional

description of the circuitry.

1.2 RELATED DOCUMENTATION

Double D Software Manual P/N IOD-1201M

FD 179X-01 Specifications

Z80A-CPU Technical Manual

Jade Computer Products

Western Digital Corp.

Zilog, Inc.

1.3 DESCRIPTION

The Double D is an intelligent S-100 based disk controller.

It is capable of handling up to four full size (8") or mini (5")

disk drives. Provisions have been made for double sided drives.

Single and double sided drives may be mixed. The controller is

capable of single density (FM) and double density (_FM)

operation. It can be used in software polled as well as

interrupt driven environments. Circuitry is implemented on a

four layer printed circuit board where one inside layer is used

as a ground plane. This provides for a minimal amount of ground

noise. This board was designed to meet the proposed 8-100 signal

disciplines as defined in IEEE Task 696.1/D2

The Double D contains an on-board Z80A microprocessor with 2K

of static memory. The on-board processor runs simultaneously

with and transparent to the S-100 bus. All critic81 timing is

handled on board; data transfers are fully buffered by sector in

the on-board memory, two levels of interrupt are implemented on

the Z80A, and a wait state generator is used to synchronize the

on-board processor to the disk transfer rate. The host system

(8080, 8085, Z80, or ?) need only transfer comman0s and data

through a block of static memory, which can be accessed from the

bus. This architecture provides a high degree of timing

independence from the host system. Also, since the disk

controller program is contained on-board in ram, this board's

operational characteristics are redefinable at any time during

system operation.

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Qume DataTrak 8 Manual Pagina 10