FEATURES
Ail
PET
models are housed
in
very similar cabinets and have a similar set
of
specifications,
as
listed in
Appendix
H.
The only differences that vou need to be
concerned
with
in using this book are:
1.
Whether
your PET has the original ROMs. also ca
lied
"old"
ROMs.
which
are Revision Level
2;
or
the
newer
ROMs. which are Revision Level 3.
The
newer
ROMs eliminate problems that were encountered
with
the original
ROMs.
Vou have Revision 2 ROMs if your
PET
powers up
with
the first line printed as:
***COMMOOORE
BASIC***
Vou have Revision 3 ROMs if
your
PET
powers up
with
the first line printed as:
###COMMOOORE
BASIC###
If vou have the old ROMs, read carefully
Appendix
G,
"Variations
for Original
ROMs {Revision Level
2)," This appendix delineates every change vou
will
have to make, chapter by chapter, to use this book
with
the old ROMs. The
changes are not extensive. The rest of this book assumes that vou have the
newer ROMs.
2.
Whether
your PET has the compact keyboard
or
one of the full-size
keyboards. This book
is
written
for ail
PET
keyboards, and differences, where
they
exist
are clearly spelled out.
3.
How
much memory your PET has. Vou r
PET
may have
4K,
8K,
16K, or 32K
bytes of memory. This
is
Read/Write
Memory
(RAM): ail
PETs
have the same
amount
of Read-Only
Memory
(ROM), A
"K"
is,
roughly, one thousand A
"byte"
is
the standard
unit
of memory storage in the
PET:
each byte can ho
Id
one character of data.
The more memory your PET has. the longer the programs and the larger
the amounts of data
it
can handle
at
one time. However, this
is
not
an
opera-
tional difference and
is
not
important
in
learning
how
to use the
PET.
Vou only
need to
be
aware of the
memory
size for the few references to the
"top
of memo-
ry," whose value
will
depend on
how
much
RAM
is
implemented in
your
PET.
5
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