Content for EPROM

EPROM

EPROM (erasable programmable read-only memory) is programmable read-only memory (programmable ROM) that can be erased and re-used. Erasure is caused by shining an intense ultraviolet light through a window that is designed into the memory chip. (Although ordinary room lighting does not contain enough ultraviolet light to cause erasure, bright sunlight can cause erasure. For this reason, the window is usually covered with a label when not installed in the computer.)

16-bit Serial Homebrew CPU - 2023

“Building a homebrew CPU from scratch takes a large number of logic chips. It is understandable, that implementing registers, program counter, ALU, and other components of the CPU in TTL or CMOS logic does require a substantial amount of chips …

One-bit Computing at 60 Hertz

“This page describes a tiny computer made from an EPROM and a few logic chips. Although its specifications are ridiculously modest, the machine readily satisfied application requirements. - Clock Rate: 60 Hertz - Instruction Repertoire: 1 - Registers: 1 (a one-bit status Flag …

Digital Circuits 6: An EPROM Emulator

“I recently designed and breadboarded a simple Z80 based computer. This was the sort of thing I did for fun and profit years ago. This time it was, well, for fun and profit. But it was a little different. Back …

Improvising an EPROM programmer

“For a project (revitalizing a large 80’s liquid crystal display) I needed to program an EPROM. The EPROm should contain a character font that goes into the LCD so it can show characters. The EPROM required was a 2764 …

Arduino Mega Eprom Programmer

“Recently I acquired a SNES. But it only came with a bootleg Mortal Kombat cartridge. Searching for games I found a lot of repro cartridges (Cartridges with the ROM swapped) being sold at local second hand selling websites. The problem …

High Voltage EPROM Man

“Meet EPROM Man. He has an EPROM body, bulb socket head, with a 16MHz crystal for eyes, fuses for arms, fuse clips for hands, adjustable caps for knee caps, and MOSFET feet. He was inspired by a similar robot that …

Dumping Old PROMs With New Hardware

“A few years ago, I managed to get hold of something I only barely knew as a Wersi MK1, an extremely rare West-German synth from 1986. The MK1 faded into obscurity due to its notoriously difficult interface, bad marketing and …