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Architecture
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Multistation VS IBM PC
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Multistation
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IBM PC
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CPU
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i8086 8MHz
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i8088 4.77MHz
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Memory
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Min 256KB
Max 512KB
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Min 16KB
Max 256KB
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Diskette
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2DD 640KB
1 - 3 Drives
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2D 360KB
None - 2 Drives
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Screen
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Japanese Display
Adapter
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Option
MDA,CGA etc.
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Resolution
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1024 x 768(24dot)
720 x 512(16dot)
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640 x 200 etc.
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Parallel Port
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Built-in
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Option
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Serial Port
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Option
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Option
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OS
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Japanese DOS
(Kanji DOS)
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DOS
CP/M-86
UCSD p-system
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Generally it is working for the improvement in
the ability though it occurs
to pass from the appearance rest of IBM PC for
several
years.
The high resolution to indicate Japanese with
24 dot is especially
characteristic.
When the next high resolution standard of VGA
is developed in IBM,
the resolution of the Multistation was
adopted.
It is a famous story.
As for the resolution of 16 dot edition, even
the expansion indication
mode of JX was adopted.
The structure of indication of Kanji
It is fundamental specifications it has the
font of the Kanji, and adds a font
to the memory more than software and to
indicate it on
the hardware.
The Kanji font card of the option must be
built in in this inside of the body
by the model.
A Kanji font card became a Kanji ROM more than
the model of the middle,
and came to be carried by the standard.
There is a thing which a DOS/V after that
understands in this structure.
But, it seems that it was not a rare method
separately
to make it indicate
a Kanji on the graphic screen even if those
days were taken because it
had already been adopted with Multi-16 of
Mitsubishi Electric corp.
An indication speed is thought to be very late
with the management speed
of the CPU having been slow when a Kanji font
card isn't attached because
there were a few memories.
In such cases as the bus and the interface
A really different individual bus is adopted
with IBM PC and MCA after that
as well.
Therefore perfectly lacks the compatibility of
the Adapter kind.
It lacks compatibility by the individual thing even if it
is attached to the
display and the keyboard.
A parallel interface lacks compatibility with
the MCA machine with a big
connector of 36 pin, too.
As for the cereal interface, the beginning was
built in in the model of the rest
by the option.
The example of the Adapter card
5250 Workstation Adapter
Note
This Adapter is the type
of the old model which 2 slot is used.
Interface
The left Display
The right Keyboard
(monochrome)
Self-diagnostic function
Multistation had a self-diagnostic
function.
There were BAT(Basic Assurance Test) and
RNA(Resident Nom
Automatic)
test in the diagnostic function.
BAT was carried out automatically at the time
of the power supply injection of
the system unit.
When the power is turned on, the logo of "IBM"
is indicated, and a number is
indicated and counted.
System program was boot when the count of that
number was
finished.
There is the following example in the manual
of 5540 as an error code.
Sorry to say, there are no materials any
further.
Only one number is
indicated. There is a
wrong point in the system unit.
1XXX, 3XXX and CXXX
There
is a wrong point in the system unit.
A111
Keyboard-cable comes off.
There is a wrong point in the
keyboard-cable.
A112 and
A1D1
There is a wrong point in the
device of either
one.
The mark of the key is
indicated. A safety protection lock
is locked.
There is a wrong point in the system
unit.
FFF2
Test-switch is the
condition of "Test".
F0XX
The wrong
point of the memory or shortage.
FXXX
There is a problem in the program.
There was unusual interruption.
RNA test came to start only when "Test switch"
in the rear of the system unit was
moved to the test side.
If RNA test started, the item that it was
diagnosed more than a menu was chosen,
and it came to do the test of each department
of the hardware.
The function of RNA test (manual of 5540
M/P)
Test No.
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The contents of a test
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0
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If the diskette for dumping is
put into a diskette drive, the contents of a
memory will be written in the diskette.
An option card etc. can be tested if a system
diskette or a diagnostic
diskette is put into the Diskette Drive 1.
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1
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Character attribute display
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2
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Graphics mode display
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3
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APA(All Point Addressable) test
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4
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Diskette Drive 1 test
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5
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Diskette Drive 2 test
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9
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The test of the memory backed
up by the lithium battery
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10
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Printer cuff test
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11
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Data printing test
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12
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BAT starting
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13
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Memory test
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14
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Font ROM test
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