| From: | Michael Rozeboom |
| Date: | 26 Oct 2000 at 21:58:43 |
| Subject: | Re: ROM types (apparently-was: Re: AOS35: Re: Amiga CD Format) |
Hello Brian E. Doe
On 25-Oct-00, Brian remarked about Re: ROM types (apparently-was: Re: AOS35: Re: Amiga CD Format):
>BD ----- Original Message -----
>BD From: "Peter Wagner" <pswag@hotmail.com>
>BD To: <os35list@amiga.com>
>BD Sent: Wednesday, October 25, 2000 8:15 AM
>BD Subject: ROM types (apparently-was: Re: AOS35: Re: Amiga CD Format)
>BD>> From: "Xavier Messersmith"
>BD>
>BD>> ROM = Read Only Memory. These may not be EPROM =
>BD>> Erasable Programmable ROM. be to run a specific flashROM update that
>BD erases
>BD> > the ROM's memory or to pull them out of their sockets, insert them
>BD> > into a EPROM programmer, and flash them there.
>BD>
>BD> Hi,
>BD>
>BD> just to speak exactly:
>BD>
>BD> EPROM *is not* Flash, and EEPROM *maybe* Flash.
>BD [...]
>BD> FLASH EEPROM:
>BD> EEPROM utilizing Intel technology, AFAIK to provide support
>BD> for high-speed programming and/or block erase modes.
>BD> Some chips also provide regions which can be locked to act
>BD> like ROM (used e.g. for bootstrap loader, flash programming
>BD> routines or emergency fall-back code).
>BD Whatever happened with NVRAM? You don't hear much about that anymore...
Because, to further confuse everyone, they sometimes call it CMOS. Which
really is a method of making the transistors, not a specific chip.
(Complimentary Metal Oxide Semiconductor). There are also PMOS and NMOS
varieties, as well as good old TTL chips (Transistor-Transistor Logic).
PC users really have a lot of trouble getting their heads around CMOS Logic,
which doesn't really remember anything. 'specially when the power is turned
off.
The NVRAM used for that purpose in the PC was probably CMOS based
non-volatile memory at one time, and got shortened to CMOS for some unknown
reason.
EAPROMS are heard of either, anymore. (Electrically Alterable PROM)
Regards
Michael
Michael Rozeboom
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