View source for GE 645

==== Appending Mode ====
By default this is normal mode of Memory addressing, both Master and Slave modes normally operate in this mode. Indirect words and operands are accessed via Appending Mechanism via the process of placing a 1 in bit 29 of the executed instruction. Effective addresses are thus either added to a [[base address]], or the offset is linked to the base address. 
 
{| class="wikitable"
!Functions
! colspan="3" |Mode
|-
|
|Slave
|Master
|Absolute
|-
|Privileged instructions
|No
|Yes
|Yes
|-
|Interrupt inhibit (bit 28 of instruction word)
|No
|Yes
|Yes
|-
|Address for Instruction fetch
|Appending
|Appending
|Absolute
|-
|Address for Operand fetch
|Appending
|Appending
|Controlled by Bit 29 of instruction word
|-
|Restriction of access to other segments or pages
|Some
|Some (less restrictive than slave)
|N/A
|}