THE STANDARD OF EXCELLENCE IN MICROCOMPUTER ~= pcs-aO/21· SYSTEMS 1M IIVISAI ., pcs-aO/22

IMSAI FLOPPY DISK SYSTEM

SYSTEM COMPONENTS

The IMSAI Floppy Disk System consists of a Controller Set and a Drive Assembly. The user may select between the two controller sets described below.

. ,... DIO-C Controller The DIO-C Controller is a two board interface compatible with all IMSAI 8080/85­ based microcomputers. This interface can change dynamically between single and double density, as required by the new IBM formats. In double density, disk storage capacity is up to 625K bytes per drive.

FEATURES Under software control, the main system program can modify the recording formats for special functions. CALCOMP DISK DRIVES In a multiple disk system, the user may specify up to four formats simultaneously. In a single drive system, UP TO 2.5 MEGABYTES OF ON-LINE the user can read diskettes in single density ; then, using STORAGE the same physical device, the user can switch to a double density format and transfer the information to a new DESK TOP CABII\IET OR RACK MOUNT diskette to achieve economy in storage.

IMSAI's PCS-80 /21, 22 Floppy Disk Systems are desk­ top or rack mount units designed for file handling and FIF Controller -- The FIF Controller, compatible with data processing applications. System configurations are IMSAI's 1-8080 microcomputer, is a two board interface. based on either IMSAI 's FIF Controller or new DIO-C The F I F moves data between the system's memory and Controller. Up to four CalComp disk drives are sup­ the peripherals via a Direct Memory Access channel (DMA), thus requiring no CPU monitoring. Using the ported by either controller. With the DIO-C Controller, FIF Controller, CalComp disk drives use an IBM 3740­ up to 2.5 megabytes of on-line storage are available. compatible single density format. Disk storage capacity IMSAI is the first microcomputer manufacturer with a is up to 256K bytes per drive. disk system and controller (DIO-C) that supports four different formats, including the new IBM formats for double density. The IBM formats are the new industry­ IMSAI Drive Assembly -- Both IMSAI controllers use a wide standard for business applications. drive assembly that includes floppy disk drives, cabinets, power supplies and a light board. IMSAI offers a powerful multi-disk called IMDOS to be used with the PCS-80/21, 22. With over twenty utilities, IMDOS has the flexibility that is When purchased as part of the floppy disk system, ideal for the systems developer or small business user. IMDOS is CP/M-compatible * and may be used with all each CalComp floppy disk drive includes a power CPM-compatible appl ication packages . I M DOS uti I ities supply to provide all power and signal connections for include a video/context editor, assembler, peripheral the drives ana light board. Up to four standard floppy disk drives and power supplies may be used in a daisy interchange program, dynamic debugging tool, disk and chain configuration from a single controller board set. memory testing program, as well as facilities for data Provisions are included in the power supply to terminate management. all control signal lines from the controller set. The *CP/M is a registered trade mark of power supply provides independent, fully regulated +5 Corporation. and +24 volts. SYSTEM CONFIGURATIONS

PCS-80/21, 22 Floppy Disk Systems consist of a disk interactive controller and from one to four drives. Individual drives are also avail able for retro-fit upgrade from PCS­ 80/21X to 80/22X (X=A, B, c, D). Each desk-top cabinet houses two drives.

FIF CONTROLLER BASED DIO-C CONTROLLER BASED

CABINET A CABINET C

DRIVE 0 DRIVE 0 PCS-80/21A PCS-80/21C (INCLUDES FIF CONTROLLER) (INCLUDES DIO-C CONTROLLER)

DRIVE 1 DRIVE 0 DRIVE 1 DRIVE 0 PCS-80/22A PCS-80/22C (INCLUDES FIF CONTROLLER) (INCLUDES DIO-C CONTROLLER)

CABINET B CABINET D

DRIVE 2 DRIVE 2 PCS-80/21B PCS-80/21D (EXPANSION UNIT) (EXPANSION UNIT)

DRIVE 3 DRIVE 2 DRIVE 3 DRIVE 2 PCS-80/22B PCS-80/22D (EXPANSION UNIT) (EXPANSION UNIT) PCS-BO/21, 22 SPECIFICATIONS

Formatted Storage Capacity: DIO-C Controller:

Formats Physical Compatibility: Slots Requ ired in Single Density IBM 3740 Motherboard 2 Double Density IBM GA21-9257-1 Max imum Drives Supported 4 standard floppy disk Trac ks 77 drives

Bytes Per Drive Using D I O-C Controller *: Recording Density Single or Double Density

Single Density : Compatibility All IMSAI 8080/85-base d 26 Sectors Per T rac k 256,256 bytes microcomputers 15 Sectors Per Track 295,168 bytes Memory Address Space Required EOOO-EFFF Double Den sity: (4K of memory) 26 Sectors Per Track 509,184 bytes 8 Sectors Per Track 625,920 bytes Environmental Requirements:

Bytes Per Drive Using FIF Controller: Temperature: F (10 C) to 100 F Single Density (26 sectors Operating o (37 .8 C) ambient, max i­ per track) 256,256 bytes mum gradient to 20 F pe r hour

Track Density 48 tracks per inch Nonoperating -30 F (-34.4 C) to 140 F (60.0 C) Recording Density 6,536 frpi (inside track) Relative Humidity: Rotational Speed 360 rpm + 2.5% Operating 10% to 80%, maximum Transfer Rate: wet bulb (85 F or 29.4 Single Density (FM) 250 Kbits/sec C) Double Density (MFM) 500 K bits/sec Nonoperating 5% to 98% w ith no con­ Operating Times: densation

Track to Track 6 ms Altitude:

Random Access Seek (Latency) : Operating Mean sea I evel to 10,000 Maximum 166.7 ms feet Average 83.3 ms Head Load Time 30 ms Nonoperating 1,000 fe et below sea level to 15,000 feet above sea level Power Supply: . F I F Controller:

Slots Required in Domestic 110-120 Volts AC at 60 Motherboard 2 Hz Universal 100, 208, 220 or 240 Max imum Drives Supported 4 standard floppy disk Volts at 50-60 H z drives Cabinet Dimensions: Recording Density Single Density 7" high x 17" wide x 20" Compatibility IMSAI 1-8080 Desk Top Model deep Memory Address space Req uired o Rack Mount Version 8 3/4" high x 19" wide

* IMDOS Version 2.05 or later are required in order to use the four formats listed for the DIO-C Controller. Older versions of IMDOS all ow one format for single density when used with the DIO-C Controller.

. . THE STANDARD OF EXCELLENCE IN MICROCOMPUTER ~= SYSTEMS I. IMSAI "

IMSAI Manufacturing Corporation 14860 Wicks Boulevard IMSAI EUROPE San Leandro, California 94577 EUROPA Terrassen, 8 rue Jean Engling 415483-2093 TWX 910366-7287 Dommeldange, Luxembourg 43-67 -46 Telex: 1428

Printed in the U. S. A., IMSAI Manufacturing Corporation Specifications subject to change without notice 9.22.78

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