Mitsubishi Electric LS Pro Hardware Technical Reference page 126

This manual describes the LS Pro fitted with a Revision D system board. During the first
eight months of production the LS Pro range was fitted with Revision C system boards.
This Appendix helps you identify which revision of system board you have, and
describes the differences between revisions C and D.
Identifying system board revisions
External The only way to identify which revision of system board is fitted in the system unit
identification without obtaining access to the system board is to refer to the model number label on
the rear of the system unit.
Systems fitted with a Revision C system board have model numbers starting BN.
Systems fitted with a Revision D system board have model numbers starting BO.
Internal The easiest way to identify which revision of system board is fitted in the system unit
identification when you have obtained access to the system board is to refer to the identification label
at the front left of the system board.
Both revisions of board are labelled PC223. Revision C boards are labelled PC223/C,
PC223/C1 or PC223/C2. Revision D boards are labelled PC223/D2.
Differences
There were two major changes between revision C and revision D.
1. Video controller
Where the revision D board is fitted with either a CL-GD5422 or CL-GD5426
video controller the revision C board uses a CL-GD5410. Since the 5410 video
BIOS is more compact than the 542X BIOS of the Rev D board the memory map
between C0000h and 100000h (768k and 1M) is different on Rev C boards.
Details on the CL-GD5410 and the Rev C memory map are given later in this
appendix.
2. Serial port
Revision D of the system board is fitted with an 16C452 serial and parallel port
controller which provides one parallel and two serial ports. Revision C of the
system board is fitted with an 16C451 serial and parallel port controller which
provides one parallel and one serial port (COM1).
Revision C system board
LS PRO HARDWARE TECHNICAL REFERENCE B/1