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BOOTSTRAP LOADER
The IMSAI Bootstrap Loader is a system that allows the user
to get a general paper tape loader, into any region of RAM
using only a 32-byte key-in.
To use this loader, proceed as follows:
1.
Key in the basic bootstrap given below starting,at
location 0000.
3E CE D3 03 3E 17 D3 03 21 20 00 06 F8 DB
02 CA 0D 00 DB 02 77 3C CA 08 00 23 05 C2
2.
Mount the bootstrap tape in the paper tape reader on the
teletype so that the block of rubouts (frames with all
the holes punched out) is in the reader.
3.
Set the PROGRAMMED INPUT switches to the high order 8
bits of the address where the paper tape loader is to be
located, e.g., to put the loader at 5C00 hex, set the
PROGRAMMED INPUT switches to 5C hex.
below.)
4.
Press STOP, RESET and RUN, then manually start the paper
tape reader on the teletype.
If
all
goes well, the tape'should go
at
the
end, then the loader will print an
If this ' is the case, refer to the IMSAI Paper Tape Loader
section to use the loader.
If the loader does not type an asterisk after the tape has
gone through the reader, this means the loader was not read in
correctly.
Proceed as follows:
1.
Check the basic bootstrap key into it as correct.
2.
if the key-in is correct, check the bootstrap tape for
tears or distorted holes.
with cellophane tape.)
If the key-in and bootstrap tape are correct, the problem
may be dirty contacts in the teletype reader.
the bootstrap procedure from the beginning.
WARNING:
1.
Since the bootstrap loader resides in location 20 hex - 120,
do not try to load the- paper tape loader below 200 hex or
it will overlay the bootstrap.
IMSAI 8080
Bootstrap Loader
It requires an ASR33 teletype.
(See the warning
through the reader, stop
(These may usually be fixed
03 E6
0D 00
on the teletype.
Try repeating
P G M - 4 A
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