Panasonic JB-3300 Technical Manual page 126

BLOCK DIAGRAM
Option Slots
Block Diagram
X-Tal OSC
0
14.3181
Power Down HD Controller Slot
Detector
XAENCPU
F | XPOR Buffer
XAB7~ XABO BA XAB7~ XABO
Address Bus
AIS ~A8 ABIS ~AB8 ABI9~ AB8
Address Bus
7~ D087 ~ DBO
Buffer Data Bus
WAIT Control Bus
au
LS24 Dota Bus
Data
Bu f fer
LSi58 LS273
Buf fer
Address
MPX.
Drive
Select
256K x 8
Buffer
L$245
BIOR.
Date
But fer
XIOCHCK LS373 uPD765
MAS
~ MAO
INTR Memory
Expansion Flexible
Buffer Memory Disk -j
oT VD7~VDO
5.25-ind
ller FDDs
DEN %CS/1s5670
8237A -5 OMA XCS.XXIOR, XXIOW XRAS. XCAS.XWE
Page
Co- 6245 LSi74
DMA
Processor
5
troller CRT VIDEO rroke
XAENOMA Generator Disploy Register Printer
CRT
ROM Address MPX.
cs CPU Address OT
Decode
L$240
Wie) fus
Buffer
cs
Decode
L$244
Data
ALE DEN Status
Buffer
System
LS$243 Switch
BIOR
Buffer
8255A-5 ro
x XMEMR. EIA
X1OR. XIOW X XMEMW. 170 Driver RS-232C
XICR.
XIOW.
Ports
XXIOR
Speaker
Interrupt
roller
XXIOR.
Keyboard
Il
Figure 3-l