Toshiba T1900 Series - Page 4

1.2 System Unit Block Diagram
Figure 1-3 is a block diagram of the T1900fI'1900C system unit.
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BIOS ROM
12V
1281(x 8bII
CPU3V
CPU 1488SXA
(CACHE 8KB)
(J
)
B3V
System ConboBer· G A
vee
VCC : +5V ( +5V )
B5V : Badwp 5V ( +5V )
ATC 3V: RTC Backup (+3V)
MeV : Pawer supply
mlcrapracas80r ( +3.3V )
CPU3V : +3.3V
(+3.3V)
83V:
Baclwp3.3V
(+3.3V)
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B3V
·'4 System
I
Mernary
12
L._._._._ ....•. J
512K x 8bI1 x 8
K-
MBS1andard
OMB Maxlnum
J
Serial Pon 9P1 n
vee
TII01-SI
~
DMAx2. PIC x2. PIT x 1, SIOx2
Prlnt.rlEld. FDD
25
Pin
FDCx1,YFOx1
~
InLFDD
3.5
~
HOD
2.5
:>I
ATC3V
RTC
1
IB5V
_IBSV
I
Monoctuom.
/I VGA Controller GA
---...::t VRAM
LCD or
STN ColDr LCD
~ ~MCIA Conl.-GA 1
PCMCIACard
..
vee
lint. Keyboard I r- Ball PoInt Mouse
KBC
.h
S
-. _.9Uk!.~!!..._
~PS/2 Keyboardl PS/2 Mouse Pan
MCV
Figure 1-3 T19001T190OC System Board Block Diagram