User`s manual

all the same commands are available. See the Interfacing and Com-
mands chapter. Also see the PGMX chapter. See Appendix C for
default baud rates.
Remember that the menu selection of the part determines what
“programming algorithm” is used and the “programming voltage”. The
programming algorithm is the set of instructions built into the 9000 that
determine what voltages to put where, when. The programming volt-
age is the level of elevated voltage that is to be applied to the pin
selected by the programming algorithm.
Remember also that selection of the wrong part number might cause
you to destroy your eprom.
Set the eprom menu selection (while communicating with the 9000
with PGMX) by typing the letter M plus the letter indicated by the
selection. If you already know what part you are using but forgot what
selection to make, type M plus a <cr> to get a menu of parts to select
from. Make sure you know what you are selecting if you use the M<cr>
method of selecting parts. It is easy to find say a 27128 in the menu,
but if you don’t know that there are 3 different types of 27128’s then
you have a 33% chance of making the right selection. As it turns out,
there are 3 selections for 27128; the first uses 21 volts. The second
uses 12.5 volts, and the third uses the 27256 algorithm and 12.5 volts
(National

27CP128). If you know your part uses 12.5 volts, you can
simply make that 12.5 volt 27128 selection (if you know which selection
is the 12.5 volt part, selection “2” in the case of a 12.5 volt part and not
“F”).
Once the menu selection is made, it will stay that way until you lose
power or you make another selection.
If the Busy led is off, you may now load the 9000 with your part.
Caution!
If the Busy led is on, power is applied
to the socket, and removing or install-
ing an eprom at that time will damage
it and/or the 9000. Always make sure
the power is on and the Busy led is
OFF before removing and installing
an eprom.
Chapter 2 Getting Started Quickly Model 9000
Page 4