In article ,
Dave Hinz wrote:
On 28 Apr 2005 17:29:05 -0700, wrote:
Hello,

I am looking for the RS232 ROM chip. I have a ROM
burner, so I can make copies.

So many problems with two short sentences. What are you actually
trying to do? RS232 is a serial connection protocol. ROM is
read-only memory,

Yes -- both statements are correct -- but the ROM may contain
the drivers to allow the Anilam Crusader II to utilize the RS-232
hardware. IIRC, it was an option -- and allowed both transferring
to/from the little cassette tape unit, and to/from a computer of your
choice.

It may also need an additional card to add the RS-232 hardware,
with only a connector on the back of the machine waiting for that.

and ROM burners don't exist - the chip is
made from a mask - so I'm guessing you don't have a ROM burner.

There are three types -- before you get into FLASH ROM which
probably was not used back then.

1) The mask-programmed ones, which need to be made in *very*
large quantities to be cost efficient.

2) EPROMs (and EEPROMs) which can be programmed by a so-called
"ROM Burner" of some form or other, and which are used for small
production runs, as well as prototypes. These can be erased
(Usually with UV light for the EPROMs, and with voltage
application for the EEPROMs.) Back in the early days, X-rays
were an alternative way to erase EPROMs -- both the UV-erasable
ones with the quartz window, and the ones with a metal lid which
could not be erased by UV.

3) Fusible link PROMs -- which are truly "burned" to program them,
and if you mess up, you have to start over with a fresh one, as
there is no way to erase them.

What are you actually trying to do? Tell us the thing you're
trying to fix, rather than what you think the solution is.

He wants to add the ability to save and load programs through
the RS-232 port - for which he needs both hardware (which may or may not
already be present), and the firmware, (which goes into a ROM, PROM or
EPROM.)

Ideally, I think that he should contact Anilam, and see whether
they still support the Crusader-II. If they do, the right thing to do
is to buy the EPROM (or at least the code) from them. If they no longer
support the Crusader II, then it is time to ask for others who have the
ROM or EPROM for the information to burn a new one. (And he may still
need the hardware to support the RS-232 interface -- which may go into
another card slot, or may simply require chips to be plugged into
sockets on the existing boards.

Enjoy,
DoN.
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