The Nec APC III appears to be the U.S. version of the NEC PC-9801, which was made
in a variety of configurations.
This machine was partially IBM PC compatible, but neither the PC bus or BIOS
were cloned. It had an NEC 7220 graphics chip which was not directly CGA
compatible, but was much higher resolution, and quite fast for its day.
The CPU is an 8086 running at 8 MHz with 128K of memory. The system used an OEM
version of MS-DOS 2.11, modified to work with its non-standard BIOS and
hardware. Simple DOS applications that did not make use of IBM BIOS calls
or of lower-level hardware would work.
Optionally there was an expansion board called SLE (for Software Library Expander) which some nicknamed the SLEeze board. This board included a second 8086 processor, Phoenix BIOS and memory. In conjunction with its accompanying software this board
allowed for "more PC compatibility" by emulating a true PC clone with CGA
graphics. Accounts of how well this actually worked vary.
NEC also ported a version of System III UNIX and released it as PC-UX
available as an optional OS. NEC also provided a hardware-based
virtual memory paging board for PC-UX which helped performance.
Other options included a 10MB hard drive. Memory was expandable to 640K.
Thanks to Richard Bramante for information and pictures.
We need more info about this computer ! If you designed, used, or have more info about this system,
please send us pictures or anything you might find useful.
END OF PRODUCTION
BUILT IN LANGUAGE
101-key with 12 function keys, cursor and numeric keypads
128 KB up to 640 KB
40 or 80 columns x 25 lines
640 x 400 dots bit-mapped color
Floppy Disk Drive, RS-232C, Printer, C-bus slot x 6
BUILT IN MEDIA
2 internal TEAC FD-55B-01-U 5.25'' floppy drives - 720 KB in native mode, 360 KB with the SLE board