15 Mar
2018
15 Mar
'18
7:12 p.m.
On 15 Mar 2018 at 17:13, Henry Baker wrote:
Problems with XCT (execute one instruction):
[...]
* only one level of execute (at least for IBM)
On the PDP-1 (I know, more comments from the stone age) it did "infinite" levels of indirect, But: [...]
* what are the semantics in the case of interrupts?
The semantics were clear: indirect chains could be interrupted, and when the handler returned it'd start on the indirect again. If it made it to the end of the indirect chain, that instruction would execute and then the interrupt would happen. /Bernie\ Bernie Cosell bernie@fantasyfarm.com -- Too many people; too few sheep --