Read-only memory - Revision history

Jnc: minor rectification, better cat

2022-04-26T10:58:01Z

minor rectification, better cat

Jnc: /* External links */ +1

2021-03-14T23:30:03Z

‎External links: +1

Jnc: +cat

2018-12-16T23:28:07Z

+cat

Jnc: bold name targets

2016-03-20T02:29:54Z

bold name targets

Tor: Typo fix: then -> than

2016-02-10T11:12:46Z

Typo fix: then -> than

Tor: Fixed some typos and inconsistencies, and updated the part about EEPROMS (they _can_ be updated in-circuit)

2012-11-21T07:08:32Z

Fixed some typos and inconsistencies, and updated the part about EEPROMS (they _can_ be updated in-circuit)

Neozeed: /* EPROM */

2009-10-08T20:24:12Z

‎EPROM

Neozeed: lame explination of rom's.

2009-03-03T15:14:36Z

lame explination of rom's.

New page

ROM is simply Read Only Memory.

Unlike [[RAM]] ROMs cannot be written to. ROMs are also typically slower then RAM.

ROMs come in several flavors:

== PROM ==
PROM's can be programed ONCE then read many times. If there is any mistakes in the PROM code, the entire chip must be disgarded. While PROMs can be read in a normal board, they need to be programmed in a special device.

== EPROM ==

EPROMs can be erased after they have been programmed. Normally there is a small window in the chip in which exposure to UV light will erase the EPROMs programming. EPROM's need to be programmed in a special programmer.

== EEPROM ==

EEPROMS can be erased electronically, and reprogrammed. While similar to [[Flash Memory]], however they need to be erased & programmed in a special programmer.

@@ Line 1: / Line 1: @@
 '''ROM''' is simply '''Read Only Memory'''.
-Unlike [[RAM]], ROMs cannot be written to.  ROMs are also typically slower than RAM.
+Unlike [[Random Access Memory|RAM]], ROMs cannot be written to. At one point, ROMs are also typically slower than RAM.
 ROMs come in several flavors:
 == PROM ==
 PROMs can be programmed ONCE then read many times.  If there are any mistakes in the PROM code, the entire chip must be discarded.  While PROMs can be read in a normal board, they need to be programmed in a special device.
 == EPROM ==
 [[Image:M27C512 EPROM.jpg|150px|right|An EPROM]]
 EPROMs can be erased after they have been programmed.  Normally there is a small window in the chip in which exposure to UV light will erase the EPROMs programming.  EPROMs need to be programmed in a special programmer.
 == EEPROM ==
-EEPROMS can be erased electronically, and reprogrammed through the application of higher than normal voltage. In modern EEPROMS this is generated internally. Unlike EPROMs EEPROMS can be rewritten in-circuit.
 ==External links==
@@ Line 19: / Line 23: @@
 * [http://madrona.ca/e/corerope/index.html Core Rope & Woven-Wire Memory Systems]
-[[Category: Basics]]
+[[Category: Computer Basics]]

@@ Line 14: / Line 14: @@
 == EEPROM ==
 EEPROMS can be erased electronically, and reprogrammed through the application of higher than normal voltage. In modern EEPROMS this is generated internally. Unlike EPROMs EEPROMS can be rewritten in-circuit.
 [[Category: Basics]]

← Older revision		Revision as of 23:28, 16 December 2018
Line 14:		Line 14:
	== EEPROM ==		== EEPROM ==
	EEPROMS can be erased electronically, and reprogrammed through the application of higher than normal voltage. In modern EEPROMS this is generated internally. Unlike EPROMs EEPROMS can be rewritten in-circuit.		EEPROMS can be erased electronically, and reprogrammed through the application of higher than normal voltage. In modern EEPROMS this is generated internally. Unlike EPROMs EEPROMS can be rewritten in-circuit.
		+
		+	[[Category: Basics]]

@@ Line 1: / Line 1: @@
-ROM is simply Read Only Memory.
+'''ROM''' is simply '''Read Only Memory'''.
-Unlike [[RAM]] ROMs cannot be written to.  ROMs are also typically slower than RAM.
+Unlike [[RAM]], ROMs cannot be written to.  ROMs are also typically slower than RAM.
 ROMs come in several flavors:
@@ Line 13: / Line 13: @@
 == EEPROM ==
 EEPROMS can be erased electronically, and reprogrammed through the application of higher than normal voltage. In modern EEPROMS this is generated internally. Unlike EPROMs EEPROMS can be rewritten in-circuit.