IBM 21Y Manuel D’Utilisation

Netfinity 3500-M20 – Type 8657 Models 21Y, 22Y, 31Y, 32Y,

1-2-1      
(Programmable 
Interval Timer 
failed)

1. System Board

1-2-2
(DMA 
initialization 
failed)

1. System Board

1-2-3
(DMA page 
register 
write/read failed)

1. System Board

1-2-4  
(RAM refresh 
verification 
failed)

1. DIMM

2. System Board

1-3-1
(1st 64K RAM 
test failed)

1. DIMM

2. System Board

1-3-2
(1st 64K RAM 
parity test failed)

1. DIMM

2. Processor

3. System Board

1-4-3  
(Interrupt vector 
loading test 
failed)

1. System Board

2-1-1
(Secondary 
DMA register 
failed)

1. System Board

2-1-2
(Primary DMA 
register failed)

1. System Board

2-1-3
(Primary 
interrupt mask 
register failed)

1. System Board

2-1-4
(Secondary 
interrupt mask 
register failed)

1. System Board

2-2-1
(Interrupt vector 
loading failed)

1. System Board

2-2-2 
(Keyboard 
controller failed)

1. System Board

2. Keyboard