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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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FLOPPY DISK DRIVE (COMPUTER) x DISK DRIVE (FLOPPY) xx COMPUTER INPUT & OUTPUT Build a special wooden box to hold your computer diskettes. The types and uses of direct access storage. A general review. Build this economy floppy disk interface. Uses only 17 integrated circuits. Est. cost: $60. A floppy disk tutorial. The mechanics of floppy disks and comparison with other storage mediums. Floppy disk interface board with inputs and outputs designed and buffed for use with a Motorola 6800 processor and a Memorex 651 floppy disk drive. A minifloppy interface. Schematic for a prototype controller which is similar to the one featured in the January 1978 issue. This interface is for the minifloppy drives available from Shugart or BASF. The interface show is designed for interfacing to a Motorola 6800 microprocessor. Interfacing the Sykes OEM floppy disk kit to a SwTPC MP-68 personal computer is accomplished by constructing the interface described in this article. Includes a schematic for power supply for the disk system and the software for reading and writing to and from the disk. Partitioned data sets. How to implement partitioned data sets in order to make your floppy disk storage more efficient. Files on parade. A look at files, the organizational structures used by computers to manage information on disks. Part 1. Types of files. Files on parade. Part 2. Using files, file protection systems, etc. Editorial on the importance of backing up your floppy disks. Includes programs written in Pascal to recover a destroyed disk directory. Picking up the pieces. How to rebuild a bit map of a floppy disk if it happens to be accidently erased (includes a program written in TDL Z-80 relocating the assembler). The article describes the two main data file organizations used on floppy disks. IBM compatible disk drives. What does it mean? A description of the IBM floppy disk soft-sector rules. Sophisticated horse race game demonstrates the use of sequential and random access disk files. Written in North Star BASIC. (PASCAL options: Sept 1980 pg 94). Interface a Shugart SA400 disk drive to an 8080A-based computer by building this disk controller board. Comparing floppy disk drives by software simulation. Determine relative performance of different units by simulating their mechanical functions in a BASIC program. Build the Disk-80, a 32 K-byte memory expansion and 5" floppy-disk controller for the TRS-80 Model 1 computer. Also has a Centronics parallel printer port and real-time clock. A relocatable bootstrap for the Tarbell disk controller. Useful for some Z80 systems which do not work with the Tarbell ROM. Improve your TRS-80 disk operation by adding this external data separator circuitry to the Expansion Interface. Build a super simple floppy-disk interface. Part 1. Uses the FD400 drive from Pertec, the Western Digital 1771 IC and connects to a 6502-based microcomputer. A file catalog system for UCSD Pascal. Keep track of up to 600 files on different disks. Build a super simple floppy-disk interface. Part 2. Software. A disk catalog program for the TRS-80. Program numbers each disk and catalogs its contents. Floppy-disk performance. Tips on increasing the speed with which data can be read from floppy disks may require a non-sequential arrangement of records. Skip sequential: A new file structure for microcomputers. An interesting technique for North Star and Microsoft BASICs combines the speed of random-access disk files with the space-saving advantages of sequential-access files. Find that disk. A simple filing system for your floppy disks that enables you to locate the correct one in each box of disks, without having to look at each label. Binary-format number storage on the Apple II disk. A machine-language routine to read and write binary data to a text file. A date/time program for disks keeps a record of when each disk was last used. Writing device drivers for MS-DOS 2.0 using Tandon TM100-4 drives. The increase in flexibility can be worth the added effort. Inside the TRS-80 Model 100's ROM. Exploring the built-in software. Includes a program to display all TRS100 files, even erased files. Tip: How to lengthen the time that the Apple II disk drive motor remains on so that file transfer time is shortened. Tip on cleaning floppy disk drive heads. The floppy disk. Three articles. (1) Comparing brands. (2) Theory of disk-error correction. (3) Formats. Modify the LED indicators on the Sanyo MBC 550 computer floppy disk drive. Aligning PC floppy-disk drives using basic tools, a dual-channel oscilloscope with external trigger, and a couple of special diskettes. Add write-protect switches to PC floppy drives. Simple add-on allows you to manually write-protect floppy disks by flipping a switch. Floppy diskettes. How they work, how they differ, what pitfalls to avoid, and which ones are best to use on your computer. Tabular listings and pinout drawings for floppy-disk, hard-disk, and SCSI interfaces. Disks and drives. A look at the technology behind the most popular mass storage devices for microcomputers. A second article looks at multi-megabyte minifloppies. Choosing the right floppy disk media. Making floppies into flippies. How to convert floppy disks so that you may use both sides of them. Tips on storing magnetic tape and diskettes for computers. All about removable media drives (flexible, hard drive, tape, and optical disk) for computer data backup or exchange. Testing and aligning a floppy drive. All about floppy disk systems. Install switches on Commodore 1541 disk drives to easily make the drive function as any of the four available device numbers. Rescue text files. A BASIC program to read individual sectors from a floppy disk, even if the directory is corrupted. Suitable for use with Radio Shack's Color Computer. Upgrading your IBM-compatible personal computer (PC). Tips on adding more memory and a second disk drive. Tip on last-ditch technique to salvage a floppy diskette which won't rotate in its envelope. I/O programming for the Altair disks. Highly annotated machine language program for handling Altair disks, plus flowcharts and background. How to convert single-sided floppy disks into two-sided floppies by cutting your own sector hole and write-protect hole for the second side. Disk power. A user's review of the Processor Technology Helios II hardware and software. Product review of Percom's LFD-400 floppy disk system for the SS-50 bus. A look at three TRS-80 peripherals: Expansion interface, line printer, and disk drive. Review of the Heath H8 disk system. Review of the Tarbell floppy disk interface and software. Interfacing SOL with a Vista disk. Hardware and software modifications necessary to get a 5" floppy with CP/M to operate with Processor Technology's SOL computer. The dual disk unit is manufactured by Vista. Thoughts on the SWTP computer system. Part 6. A close look at three of the six disk systems that are available for the SWTP. They are: LFD-400 from Percom, BFD-68 from Smoke Signal Broadcasting and MF-68 from SWTP. Expanded TRS-80 disk operations. Part 1. Putting system programs on disk. How to put low-RAM machine-language programs on disk, plus an introduction to machine-language programming for beginners. File directory analysis for North Star DOS. A BASIC program which analyzes and prints the file directory on diskettes created by North Star's disk operating system and indicates which files are too large (allocated more space than needed). Thoughts on the SWTP computer system. Part 6 (continued). An in-depth look at the Percom LFD-400 disk system. Discus I disk jockey and ATE. User's review of the disk system available from Thinker Toys (Bill Morrow). Discus I is the single density version. Expanded TRS-80 disk operations. Part 2. More on storing machine-language programs and on backing up "uncopyable" programs. Micropolis disk drives. A comprehensive review. Install a simple toggle switch to equalize wear in your Heath H17 dual-disk system. Thoughts on the SWTP computer system. Part 9. Disk systems, debugging, and EPROM conversions. Single-drive diskette copier program for the North Star Horizon-1. May be adapted to other disk operating systems. How to build and use a mini-floppy drive tester. Tests all of the major functions of a drive without the need for a computer. File dump for the FLEX operating system. Prints the contents of disk files in both ASCII and hexadecimal. FLEX runs on the SWTP 6800 computer. Tip: How to connect up to 13 PET computers to the same printer and/or disk drive. Printing the North Star Disk Directory from a BASIC program by means of an assembly-language routine. Data on disk: Implementing file systems. A look at three commonly used methods of disk space management. Cassette-to-disk program written in BASIC for PET computer. Copies any tape data file to disk. Auto-menu for the Apple II. Easy access to disk contents is yours with this simple program. Prints the catalog of the disk, letters each file name, and allows file access by letter instead of full name. Apple sector counter utility keeps track of the free (unused) sectors on a Apple II floppy disk. Written in machine-language. Dissecting the HDOS diskette. Inside information on how Heath's disk operating system handles disk files. Expand your H-89 by adding Heathkit's new H-77 floppy drive. Firm up your floppy with 800K. How to get 800K of data on one 5" minifloppy. Tip: Use a switch to allow two different disk drives to be attached to a PET computer at the same time. How to access the North Star diskette file directory as data from a BASIC program. Disk Master program for PET/CBM. A master directory disk (index) to all of your disk files is generated by this program. Written in BASIC. Rx for your disk drive ills. Repairs and preventative maintentance you can do yourself. Produce a list of disk contents on gummed labels using this Applesoft BASIC program and a compressed mode printer (like the Epson MX-80). Program to read IBM 3740 format 8" disks, convert EBCDIC to Apple ASCII, and store the data on DOS formatted Apple 8" disk. How to get the most out of your disk system through random access file use. Part 1. How to increase floppy disk performance. Includes tips on choosing correct density level. How to get the most out of your disk system through random access file use. Part 2. Commodore-64 utility programs: (1) Subroutine to reclaim a BASIC program lost by accidently typing "new". (2) Program to provide a printed copy of disk source files created by "Easy Script". How to add a second virtual drive to a single-drive CP/M system. How to modify Apple disk operating system 3.3 so that it formats, reads and writes 40-track disks. Adapter lets you use older disk drives on an Apple IIGS. Adapting the 20-pin DIP header to the newer DB-19 connector. Troubleshooting floppy-disk-drive power supplies. How to care for diskettes. Tips on correct handling and storage. Basics of computer disk systems. An introductory look at floppy disk systems. Buying your first computer. Choosing a floppy-disk drive. Troubleshooting computer diskette-style disk drives. Floppy/hard drive wiring tester. Circuit for a tester to check power supply connectors for correct voltage and polarity before installing the disk drive. Adding an external disk drive to your laptop computer. How to purchase a generic drive, make the I/O cable, attach a power supply, etc. All about floppys for personal computers. Write-protect notch bypass. Simple circuit electronically bypasses the write-protect circuitry of your floppy disk drive and allows you to use both sides of a floppy disk. Double density the PERCOM way. How to modify your Radio Shack Model I Double Density Adapter Kit to perform like the PERCOM Doubler. Tuning the Commodore 1541 floppy disk drive. How to align and time the drive. How to substitute two half-height drives for one full-height drive. Retrofit your IBM PC or clone with a 3.5" disk drive. Some tips. Floppy-disk data storage. Learn all about Apple and IBM disk formatting, including copy protection. Floppy-disk data storage. Learn all about Apple and IBM disk formatting, including copy protection. How to connect a surplus 5.25" disk drive, like the Siemens FDD 100-5B, to a Radio Shack TRS-80 computer or Heathkit computer. The trick is to make it Shugart SA-400 compatable. Tips on installing the Percom Data Separator on the disk controller board of a TRS-80 computer. Used to eliminate clock/separation problems when using non-Radio Shack disk drives. Storage shelf with vertical dividers is used to hold floppy disks. The unit is made entirely from wood and designed to be placed underneath your computer monitor. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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