nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqa3xmjrlk9d5sx268p4hth78n7rswndax2f7w8kdtcsfk537ptgyqautus5
this stuff really is use it or lose it
That's cool about the stuff you did back the...
@nprofile1q...
I remember a few things. For one, the 390 didn't have a stack register, but it did have 'Index Registers' which could be used in lots of interesting ways. Forex, for *fast* table lookup.
General purpose registers often had standard uses, especially when writing low-level subroutine code to be called by COBOL. Forex, R12 was the program counter, R13 was the address of the savearea, and R14 was the return address.
I remember a few things. For one, the 390 didn't have a stack register, but it did have 'Index Registers' which could be used in lots of interesting ways. Forex, for *fast* table lookup.
General purpose registers often had standard uses, especially when writing low-level subroutine code to be called by COBOL. Forex, R12 was the program counter, R13 was the address of the savearea, and R14 was the return address.
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