|
 |
 |
 |
|
 |
|
 |
|
|
Last Updated
03/31/2019
Sitemap
|
|||||||||
Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
|||||||||
|
RANDOM-ACCESS MEMORY sa BUBBLE MEMORY sa RANDOM-ACCESS MEMORY TESTING sa READ-ONLY MEMORY x COMPUTER MEMORY (RAM) x MEMORY (RANDOM-ACCESS) x RAM xx COMPUTER INPUT & OUTPUT xx DIGITAL ELECTRONICS Give your micro a megabyte. Discussion of virtual memory techniques for expanding small computer memory systems. The intelligent memory block. Consider adding combined memory and microprocessor subsystems to your existing system as the best way to expand memory and enhance performance. Who's afraid of dynamic memories. How dynamic memories work and how they compare with static memories. Smart memory. Part 1. The concept of associative memory is discussed. Smart memory. Part 2. Black box diagrams describe the workings of an associative memory. Video Doodler program for the COSMAC ELF microcomputer utilizes the RCA CDP1861 video display controller IC. Includes schematic for a two-page programmable-memory addition for the COSMAC ELF. Dynamic memory. How it works and choosing the right board for your system. 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. Tip: Power-on sequence is important when using 4116 memory chips. Memory expansion for the Sinclair ZX-80. How to add 16K-bytes. Est. cost: $200. Practical dynamic-memory system design. A straightforward look at design with dynamic devices. The enhanced VIC-20. Part 2. Adding a 3K-byte memory board. Est. cost: $30. Build this memory. Part 1. How to build a 64K-byte memory card for an S-100 bus machine using the 4116 memory device. Est. cost: $200. Build this memory. Part 2. Constructing the memory card. Build a real-time memory-activity display. Watch computer activity on an oscilloscope. Double Heath/Zenith memory without an extra plug-in board. Replacing the RAM and PAL integrated circuit chips to boost memory capacity to 640K. Boost the performance of an old PC or laptop using this RAM-disk speed-enhancement technique. Guide to SRAMs, NVRAMs, EEPROMs, Flash Memory, and SmartSockets. A comparison of features and a reference to device pinouts for testing and troubleshooting. Updating the TRS-80 Model I to 48K memory with 64K chips. Build a solid-state disk drive. Battery-backed memory board can be populated with 32K to 512K of static CMOS RAM (random access memory). Est. cost: $100 plus RAM chips. Semiconductor memories. An overview of today's revolutionary memory technology (ROM, PROM, EPROM, EEPROM, static RAM, dynamic RAM, MOS technology, etc.). Includes an EPROM emulator circuit. Add password boot protection to an older personal computer with this battery-backed RAM circuit which plugs into an expansion slot. Est. cost: $32. PC password protection. Add password boot protection to your PC with a novel battery-backed RAM circuit. Est. cost: $27 (kit). Solid state disk drive. Add a bootable battery-backed RAM drive to your PC. Est. cost: $400. Recycling old DIP-style DRAMs into 30-pin SIMM modules. Construction details on three DIP-to-SIMM conversion boards that can be used in four different configurations. Est. cost: $10 per megabyte (excluding cost of memory). Special section on computer memories. Do-it-yourself disk emulation for the Radio Shack Model 4 computer. How to increase your memory to the 128K maximum. Est. cost: $90. Digital fundamentals. Part 7. Memory circuits. Peering into memory IC's to see how data storage-cells are formed. Digital fundamentals. Part 9. Input/output operations used with microcomputers. Looks at programmed I/O, memory-mapped I/O, interrupt I/O, and direct-memory access (DMA). Solid-state memory devices. Basic differences between various types of semi-conductor memory devices (RAM, ROM, EPROM). All about static RAM's. A step-by-step experimental procedure that will teach you how static random-access read/write memory chips work. Upgrading your IBM-compatible personal computer (PC). Tips on adding more memory and a second disk drive. Hardware program relocation. Part 1. Introduction to the concept of memory management or memory map systems. The hardware for a 6800-based system is described. Expand your KIM. Part 3. Bus control board and memory. Decoder schematic for adding WASATCH 4K memory boards to a KIM system. Hardware program relocation. Part 2. The software. Protect your memory against power failure. Use a bank of rechargeable batteries to keep 5 volt power coming to memory even if the power fails. A trickle charger keeps the batteries always ready. Expand the memory of your KIM-1 system by using 4K memory cards and motherboard manufactured by Kathryn Atwood Enterprises. Includes schematics and tips on performing the expansion. Kilobaud Klassroom No. 12. ROM and RAM memories. How to expand your KIM-1 system economically. How to interface the KIM to a video monitor and an ASCII keyboard, add more memory, add a cassette tape recorder, and add a power supply. Both hardware and software are described. How to use S-100 memory boards in your SWTP 6800 microcomputer. Build a PC extender board that will take up to five S-100 style memory boards. Pattern for the PC board is included. How to add a write protect feature to a SWTPC 6800 4K RAM board. Onward with the COSMAC Elf. How to add additional memory up to a total of 64K. Requires the use of memory address multiplexing. A description of the technique. An explanation of the computer WAIT STATE. How the wait state affects computer memory. 8K RAM expansion board for the PET computer. Uses wire wrap technique to simplify assembly. Est cost: $160. It's time for core. Adding core memory to microcomputers has become possible with some new and surplus hardware now available to the amateur. Another KIM-1 expansion. Package the KIM-1, add a TTL serial interface, and add 24K more memory using 2114's. Est. cost: $300. More TRS-80 horsepower. Add 16K of memory and install the Level II BASIC ROM while keeping the Level I ROM. Then you don't have to reprogram earlier software. Est. cost: $100. What's new in memories. A look at bubble memories, charge-coupled devices, etc. 64K bytes on one board. User's review on the construction and use of a 64K EXPANDORAM board from S.D. Sales. This is a dynamic memory board. Includes general information on the compatibility of dynamic memories with 8080 and Z80 computers, and problems likely under DMA situations. Reduce power supply requirements for dynamic memory when utilizing the Z-80 internal refresh. Thoughts on the SWTP computer system. Part 10. How to convert some 32K dynamic memory boards to 64K. Build MicroStart, a stand-alone 256 byte memory board with five control keys that load data into memory. Add to this a CPU board, power supply, and common chassis and begin experimenting with different CPU chips. Thoughts on the SWTP computer system. Part 11. How to use the SWTP 32K dynamic memory board. How to interface an SWTP 6800 memory board to a COSMAC ELF computer. Open up (upgrade) the SWTP 6800 with a few integrated circuits and some wire. (1) Add 128 bytes of memory. (2) Open up 8K of memory space. (3) Add a second motherboard. 64K dynamic RAM memory. Part 1. Card plugs directly into the Heath H8. Can be adapted to other computers. Questions and answers for beginners. Part 2. Memory devices. Beat the MIKBUG memory squeeze. Select between having the monitor or an additional 4K of static memory at the flip of a switch on a 6800-based computer. 64K dynamic RAM memory. Part 2. Construction and checkout. Upgrade some 16K PET computers to 32K by simply replacing the memory chips. Kilobaud klassroom. Part 21. Expand the memory and I/O capability of your homebuilt computer, plus a look at programming the computer. Poor man's memory expansion for the OSI Superboard II or Challenger C1P. Add up to 16K. Est. cost: $125. Build your own 16/32K dynamic RAM memory board for the SWTP 6800 computer. Est. cost: $100. Build a RAM card for the Apple computer which can be addressed as if it were located in a slot different from the slot it is physically inserted into. How to expand the Heath H89 48K memory board to 56K (65K with CP/M) by soldering on an additional eight 4116 memory chips. How to upgrade your 8K Atari 400 to 16K of RAM memory. Est. cost: $30. How to double the program memory (to 2K) in your Sinclair ZX-81 computer by changing RAM chips. Est. cost: $10. Expand the VIC-20 memory from 5K to 8K with a minimum of effort and expense. Install a bracket to support the 16K RAM pack addition to the Sinclair or Timex computers. A description of RAM, ROM and PROM memories for computers. Upgrading a Radio Shack "bare bones" Color Computer. How to add 64K RAM, extended BASIC, and 64-column video output. Est. cost: $50. Memory expansion for Apple IIe. Low-cost 64K retrofit piggybacks on a standard 1K 80 Column Text Card. 512K hardware RAMdisk. A super-fast add-on memory looks like a disk drive to your MS-DOS computer operating system. New static RAMs for high-speed caching. An introduction to the fundamentals of cache memory. Read/Write memories (RAM's). Part 1. How they work and typical circuits. Read/Write memories (RAM's). Part 2. Programming the demonstration circuit. Microcomputer memory. Types of memories and how they work. An inexpensive expansion of TRS-80 memory. Plug-board system for adding 16K of external dynamic RAM to the existing 4K RAM. This external memory has its own power supply. How to add more RAM memory to small "training" computers such as the Heathkit ET-3400 and ETA-3400. Build a novelty, low-powered vacuum-tube RAM 1-bit memory that attaches through the parallel port of a PC. Tip: Build computer memories using the "bricklaying" technique described in the December 1977 issue. Description of the 8155 read/write memory IC that is part of the Intel 8085 family of devices. This IC contains 256 bytes of memory. Direct memory access. What it is and how it's used. Expand your Timex/Sinclair operating system. Part 1. Build this 8K CMOS RAM board with battery backup. Use it to expand user memory or to expand operating system. Expand your Timex/Sinclair Operating system. Part 2. Tips on making your computer's memory non-volatile by adding battery backup. Designing with memory IC's. Random-access memory (RAM). Looks at both static and dynamic RAM. Designing with memory IC's. Static RAM chips, specifically the 5101 CMOS memory IC. Designing with memory IC's. Automatic data sequencing from a keyboard encoder. Designing with memory IC's. Using the extra latch on the 5101 CMOS memory chip. Designing with memory IC's. Putting the 5101 CMOS memory IC to work. Designing with memory IC's. Dynamic RAM's. Designing with memory IC's. Circuit for the expandable keyboard encoder and display. Memory expansion. Explanation of the memory management circuitry found inside a typical 64K personal computer. More on memory management. Designing a basic memory-management circuit. More on memory management. Bank-switching. Two basic types of RAM, static and dynamic, are compared. Tips on designing RAM memory systems. Dynamic memory. Part 1. Dynamic memory. Part 2. Building a dynamic-RAM system around the Z80 microprocessor. Dynamic memory. Part 3. Circuits for using dynamic RAM with the Z80 microprocessor. Build the PT-68K computer. Part 8. Dynamic RAM. How DRAM differs from static RAM. Dynamic memory. Part 4. Circuits for using dynamic RAM with the Z80 microprocessor. Adding a system clock, I/O control system, and a BIOS of some sort. Build the PT-68K computer. Part 9. Dynamic RAM circuits. Build the PT-68K computer. Part 10. Dynamic RAM circuits (continued). Tips on timing considerations when adding DRAM memory to a computer operating at 8 MHz. RAM disk. Part 1. Build a solid-state "disk drive" for your PC computer. Retain important data with this inexpensive battery-backed RAM disk. Est. cost: $90 plus RAM chips. RAM disk. Part 2. Ferroelectric ICs. Chips that remember. An overview of recent breakthroughs in ideal nonvolative semiconductor memories. Includes tips on experimenting with ferroelectricity. Semiconductor memories. An overview of memory technology (ROM, PROM, EPROM, EEPROM, static RAM, dynamic RAM, etc.). | |||||||||
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. |
|||||||||