Multistation VS IBM PC
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
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
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
This Adapter is the type of the old model which 2 slot is used.
The left Display The right Keyboard
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
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)