Re: Super II questions

[dempson@actrix.gen.nz (David Empson)]

Charles T. Turley <cturley@wco.com> wrote:

> I really don't know too much about hardware, cards and burning, dumping
> or duplicating ROMS via an EEPROM, etc. But I just got an EEPROM 
> Programmer card for the Apple II (have no software for it and need the
> software). Would it be possible to duplicate the ROMS I have to an 
> EEPROM  - that are missing from your Supper II, using such a EEPROM 
> card?

Just one quick comment: I doubt that you have an "EEPROM" programmer
card for the Apple II.  It is more likely to be an "EPROM" programmer
card (which might be able to program some EEPROMs as well).

Most small volume Apple II cards use EPROMs for their firmware.  I don't
think I've ever seen an EEPROM on a commercial card.

An EPROM (Erasable Programmable Read Only Memory) has a small window on
top of the chip, and is erased by exposing it to ultraviolet light of
the appropriate wavelength for several minutes.

An EEPROM (Electrically Erasable PROM) can be erased by sending a
special command to the chip or using a special voltage.  In some cases,
they can be programmed in-circuit.  A FLASH ROM is a special type of
EEPROM that is usually faster and easier to reprogram.

Both types of chip can be programmed using many EPROM programming
devices, but there are differences: if the programmer doesn't mention
EEPROMs in its list of supported devices, then it probably can't program
them.

-- 
David Empson
dempson@actrix.gen.nz
Snail Mail: P.O. Box 27-103, Wellington, New Zealand