Content deleted Content added
Line 16:
There is a lot to be written about IBM System/360 and its successors. The jumps to 31 and 64 bit addressing. The migration of system calls from SVC (Supervisor Call) instructions, with the overhead of the interrupt handler to PC, especially for in-address-space services such as storage management. The evolution of secondary address spaces. Count Key Data disks vs fixed block (and the emulation issues). It goes on. One day…
[[User:Jhlister|Jhlister]] ([[User talk:Jhlister|talk]]) 00:56, 12 February 2010 (UTC)
The purpose of EX was not to write gratuitous self-modifying code although from your comments that was a common misuse. The purpose was to provide a way to cater for dynamic length moves and other instructions where the lengths of the operands were not known until EXecution time.
Other techniques were designed and deployed for memory constrained environments such as linkage overlays.
[[Special:Contributions/84.228.198.178|84.228.198.178]] ([[User talk:84.228.198.178|talk]]) 18:56, 18 December 2010 (UTC)
== The Difference between BAL and ALC ==
| |||