HP 5957-6657 9914A Disc Drive Jun84 free download

File name 5957-6657_9914A_Disc_Drive_Jun84.pdf

ICHAPTERI GENERAL INFORMA TION 1 Introduction The HP 911 4A Disc Memory (Figure 1- 1) is a random access data storage device. The HP 9 1 14A contains a single 3 1/2 inch double sided disc drive providing 710 Kbytes of storage capacity. The HP 9114A is battery-powered by a 6 volt lead -acid dry cell. The HP 9114A Drive supports both the SUBSET/80 and the FILBERT command set to allow the device to be compatible to existing and future HP-IL devices. HP 9114A Figure 1-1. HP 9114A Flexible Disc Memory Technical Specifications Listed next are the electrical and physical specifications for the HP 9114A disc memory. Number of drives 1 Net Weight 2.68kg (5.9 Ibs) Height 76 mm (3.00 in.) Depth 200 mm (8.00 in.) Width 28 7 . 5mm (1 1 . 5 in.) Printed 6/01/84 Part Number 5957-6557 1-1 GENERAL INFORMATION Interface HP-IL HP Double Density Format Encoding: MFM Rotational Speed: 600 RPM Bit Density @ 600 RPM: Track 79 (Inside track) 8717 BPI Track Density: 135 tracks per inch Tracks per Surface: 80 Surfaces used per disc: 2 Capacity HP 110 Series 40 and 70 Bytes/Sector: 512 Max storage capacity will vary Sectors/Track: 9 depending on the REV firmware Bytes/Drive (Formatted): 710 Kbytes used in the 40 and 70 series products. Typical would be 128K bytes. NOTE The HP 9114A spares 4 complete tracks. This reduces the usable user space to 512*09*78*2 (bytes/sector times sec- tor/traGk times unspared tracks times number of sides.) This total equals 718.848 Kbytes. Additionally, directories further reduce usable user space. This, as implemented by HP, gener- ally takes track O. Actual usable space will be 718.848 Kbytes minus track 0 for a total of 709.632 Kbytes. Access Time Track-to-Track Seek: 15 ms/track plus 42 ms settling