Service Manual

IC7 IPL ROM
OS SATURN IPL-ROM PAL DIP
Parts No.: EPR-17933
Parts
No.: MPR-17933
• Top View & Pin Layout
010
03
011
ICS BACKUP RAM
AS
AS
A10
A11
A12
A13
A14
A15
A16
1 BY'i'E
GND
D151A-1
07
014
06
013
05
012
D4
IC CXK58267 AM-1 OL SOP
Parts No. : 315-0948-10
IC SRM20257LLM1 0 SOP
Parts No. : 315-0965-10
II Block Diagram
A14
A13
A12
A11
AS
AS
A7
AS
AS
A 10 o+++.f':5l5:t==f
A4
A3
A2
A1
AO
CE1 o----or-....,
CE20•---t
•Pin Name
A0-Al7 Address inputs
CE
Chip enable
OE
Output enable
GND
Ground
BYTE
DO-DIS
Data inputs/outputs
Vee
+SV power supply
IC UPD43257B-1 OLL SOP IC M5M5255BFP-12LL SOP
Parts No. : 315-0930-10
Parts No.: 315-0964-10
IC UM62257M-70LL SOP
Parts No.: 315-1002-70
II Top View & Pin Layout
A14
vee
WE
A13
Vee
AS
MEMORY
AS
MATRIX
A11
512 X 512
CE2
GND
CE1
1
II OS
1101
1/07
1102
1106
1/03 1105
GND
I!OGATE
COLUMN
DECODER
• Description
Name Function
AO-Al4 Address inputs
1!01-I/08
Data inputs/outputs
CEl, CE2
Chip enable inputs
WE
Write enable input
Vee
+5V power supply
1101 1108
GND
Ground
-42-