Panasonic JB-3300 Technical Manual page 123

(a)
(b)
(c)
(d)
(e)
(g)
(h)
MPU
The computer uses an Intel 8088 MPU. The MPU clock frequency is
4.77 MHz.
RAM
The standard RAM capacity is 256K bytes. The capacity can be
increased to 512K bytes with optional RAM chips installed in the IC
sockets on the printed circuit board.
ROM
CPU board has 16K bytes of ROM. The ROM includes a self-test program
that 1s executed automatically when the power is turned on. It also
contains the ROM-BIOS (Basic Input/Output System).
Keyboard Interface
Through this interface circuit, data is transferred serially from the
keyboard to the MPU.
Interval Timer/Speaker Interface
The CPU board contains a programmable counter circuit, which allows
programming of an interval for the interval timer interrupt and a
beep frequency.
The speaker is installed inside the system unit.
System Switch (DIP Switch)
The CPU board has a 4-circuit DIP switch which establishes circuit
operating conditions and program branch conditions.
PDP Controller
The computer has a flat PDP (Plasma Display Panel) on its system
unit.
The PDP controller controls the PDP display functions.
The PDP controller functions as a color display adapter, with its
MC68B45P LSI working as a CRT controller (CTRC).
The PDP controller includes a 32K-byte video RAM.
FDD Controller
A wPD765AC control LSI (FDC) in the I/O board controls up to two
FDDs.
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