EVI Products - Async Floppy Drive Emulator (AFD)

Asynchronous Floppy Drive Emulator - AFD

The Asynchronous Floppy Disc Unit (EVI-AFD) is an Electronic Visions, Inc. software product which provides a low cost replacement to MODCOMP's Model 4532 Asynchronous Floppy Disc (AFD) System. The PC-based processor system is connected as a peripheral device to a MODCOMP host computer via an RS-232C half-duplex asynchronous communication channel. EVI-AFD is supported as a data storage device with the MODCOMP Asynchronous Floppy Disc handler which combines asynchronous channel and floppy disc commands. The EVI-AFD software will operate in a rack mounted, desktop, mini-tower, or notebook PC/AT configuration.

The EVI-AFD offers single and dual density hardware sectoring, providing 15 and 26 sectors per track. All sectors have a fixed data length of 256 bytes. Commands and status are transferred with a frame size of eight bits with selectable parity. The AVI-AFD provides remote and local fill features for use with the host MODCOMP computer. The Format function is performed via an offline file format program. The Copy function is performed via Standard DOS file copy command. The Local Fill is performed via the F6 function key, Write Protect is toggled via the F7 function key for floppy 0 and the F8 function key for floppy 1. The Remote Fill can also be performed on Startup of the EVI-AFD software to allow auto-startup after power fail.

Features

PC/AT Controlled Diskette System one megabyte
Multiple Asynchronous Channel Compatibility
Standard MODCOMP 15 Selectable Baud Rates
Selectable Parity Checking (Even, Odd, None)
Half-Duplex Operation
Selectable Density 295K bytes to 512K bytes
MODCOMP II/IV/Classic Diagnostic Utility Load Device (Fillable/DAX Relocatable)
Remote/Local Program Fill via Function keys
Remote/Local Program Fill on startup
Replaces obsolete hardware (AFD)
Increases performance by 75% to 100%
Utilizes PC/AT hardware technology for low cost and high reliability
Supports MODCOMP hardware diagnostics
All MODCOMP diagnostics loaded on hard drive for Local Program fill along with your OS and data files

SOFTWARE (Prerequisites)

Standard MODCOMP® AFD Handler
MAX IV/MAX 32 OS
PC/AT DOS

HARDWARE (Prerequisites)

MODCOMP System
Asynchronous Controller
Cabling to connect to EVI-AFD
PC/AT system 286+ with hard drive, floppy, RS-232C Comm Port and optional CRT
Keyboard

Compatible Communications Controllers

1907-X	Universal Communications Subsystem with a 1931 RS-232C interface module. 1097-X = (1907, 1907A, 1907B)
1908-1	Integrated Communications Subsystem with model 1909-1 RS-232C interface.
4804	Quad Channel Interface Controller with model 4803-1 RS-232C interface.
4806	Asynchronous Terminal Controller with an RS-232C interface.
4807	Asynchronous Terminal Controller with an RS-232C interface.
4808	Asynchronous Modem Controller with an RS-232C interface.
4809	Octal Asynchronous Controller with an RS-232C interface.
4850	Multifunction Controller with a 4858-1 RS-232C Port Option interface.

Model Numbers and Descriptions

AFD-1	Software Only
AFD-2	Software with a PC-AT in a Low Profile 19" rack mounted enclosure. (Height: 4¼ in.)
AFD-3	Software with PC-AT in a Desktop or Minitower case.
AFD-4	Software with PC-AT Notebook configuration.

Physical Characteristics

AFD-2	PC-AT in a Low Profile 19" rack mounted enclosure.
	Height: 4 ¼ in. Depth: 16 in. Width: 19 in. Weight: 15 lbs.

MODCOMP and CLASSIC are registered trademarks of Modular Computer Systems, Inc.
PC-AT may be a trademark of International Business Machines
EVI-AFD is a trademark of Electronic Visions, Inc.

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This page last modified on Apr 18, 2024