PB 486 R, 486T, & FORCE 486/25 Memory Upgrade Information

Warning Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty.

Note
BASE MEMORY is 640Kb always. SHADOW BIOS & SHADOW VIDEO take 128Kb each. (Comes off Extended Memory).
 

Specifications
No jumper setting required.
Recommended SIMM speed is 80ns.
This motherboard uses 30 pin SIMMs.
 

Total Memory

Bank 0

Bank 1

Bank 2

Bank 3
1MB (4)256K X 9      
2MB (4)256K X 9 (4)256K X 9    
3MB (4)256K X 9 (4)256K X 9 (4)256K X 9  
4MB (4)256K X 9 (4)256K X 9 (4)256K X 9 (4)256K X 9
4MB (4) 1MB X 9      
5MB (4)256K X 9 (4) 1MB X 9    
5MB (4) 1MB X 9 (4)256K X 9    
6MB (4)256K X 9 (4)256K X 9 (4) 1MB X 9  
6MB (4)256K X 9 (4) 1MB X 9 (4)256K X 9  
6MB (4) 1MB X 9 (4)256K X 9 (4)256K X 9  
7MB (4)256K X 9 (4)256K X 9 (4) 1MB X 9 (4)256K X 9
7MB (4)256K X 9 (4) 1MB X 9 (4)256K X 9 (4)256K X 9
7MB (4) 1MB X 9 (4)256K X 9 (4)256K X 9 (4)256K X 9
8MB (4) 1MB X 9 (4) 1MB X 9    
9MB (4)256K X 9 (4) 1MB X 9 (4) 1MB X 9  
9MB (4) 1MB X 9 (4) 1MB X 9 (4)256K X 9  
10MB (4)256K X 9 (4)256K X 9 (4) 1MB X 9 (4) 1MB X 9
10MB (4)256K X 9 (4) 1MB X 9 (4) 1MB X 9 (4)256K X 9
10MB (4) 1MB X 9 (4) 1MB X 9 (4)256K X 9 (4)256K X 9
10MB (4) 1MB X 9 (4)256K X 9 (4) 1MB X 9 (4)256K X 9
12MB (4) 1MB X 9 (4) 1MB X 9 (4) 1MB X 9  
13MB (4)256K X 9 (4) 1MB X 9 (4) 1MB X 9 (4) 1MB X 9
13MB (4) 1MB X 9 (4) 1MB X 9 (4) 1MB X 9 (4)256K X 9
13MB (4) 1MB X 9 (4)256K X 9 (4) 1MB X 9 (4) 1MB X 9
16MB (4) 1MB X 9 (4) 1MB X 9 (4) 1MB X 9 (4) 1MB X 9

32-Bit Memory Card Layout


Note
Four identical SIMMs must be installed in one bank.