Caple C871i Manual de usuario descargar pdf (Pagina 165)

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Apple II Computer Info

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From: [email protected] (David Wilson)

Newsgroups: comp.sys.apple2

Subject: Re: Hardware Project

Date: 14 Nov 98 03:15:42 GMT

Organization: University of Wollongong, Australia

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[email protected] (David Empson) writes:

>Yet another variant is Flash ROM. I've never been entirely clear on the

>difference between Flash ROM and EEPROM, as they seem to overlap in

>features. Flash is generally characterised by being able to be erased

>and reprogrammed in sectors, while EEPROM is more often bulk erased and

>reprogrammed one byte at a time.

I had the same query re the difference between Flash and EEPROM.

Here is one explanation from http://webopedia.internet.com/TERM/E/EEPROM.html:

EEPROM is similar to flash memory

(sometimes called flash EEPROM).

The principal difference is that

EEPROM requires data to be written

or erased one byte at a time whereas

flash memory allows data to be

written or erased in blocks. This

makes flash memory faster.

I find this explanation unconvincing but reading a few data sheets gives some

credence to it. For example, the MC68HC912B32 has both EEPROM and Flash EEPROM

and is described as follows:

The chip is the first microcontroller to include both byte-erasable

EEPROM and Flash EEPROM on the same device.

The Flash chips I have been using lately in another project are 4Mb (512KByte)

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 165 of 572

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Caple C871i Manual de usuario Pagina 165

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