tutorials:assemblers
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tutorials:assemblers [2023/09/23 21:28] sm5por [Processor models] |
tutorials:assemblers [2024/05/20 15:54] (current) sm5por [Instructions] User I/Omode |
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| === Input/ | === Input/ | ||
| - | //**Note:** I/O instructions are not available when the processor is in user mode, but can be executed only by the operating system kernel in system (privileged) mode. They are thus of limited interest to regular application programmers under most operating systems.// | + | //**Note:** I/O instructions are not available when the processor is in user mode, but can be executed only by the operating system kernel in system (privileged) mode. They are also specific to the I/O hardware architecture of the each processor' |
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| + | //In TOPS-20, there is a USRIO system call allowing aprivilegedprocess totemporarily enter User I/O mode (where the UIO bit ofthe processor status word isset so, that I/O operations can be executed.// | ||
| ==== Interrupt system ==== | ==== Interrupt system ==== | ||
| Line 117: | Line 119: | ||
| |DEC KL10 B|DW, FP, EA| 32--4096 KW| 32|4 DTE20, 8 RH20|PDP-11/?? | |DEC KL10 B|DW, FP, EA| 32--4096 KW| 32|4 DTE20, 8 RH20|PDP-11/?? | ||
| |DEC KS10 |DW, FP | 128--512 KW| | |DEC KS10 |DW, FP | 128--512 KW| | ||
| - | |SC-40 | + | |SC-40 |
| - | |XKL Toad-1|DW, FP, EA| ?--32 MW| ?| | + | |XKL Toad-1|DW, FP, EA| ?--32 MW| 4096| |
| |XKL Toad-2|DW, FP, EA| ?--256 MW| 4096| | |XKL Toad-2|DW, FP, EA| ?--256 MW| 4096| | ||
tutorials/assemblers.1695504497.txt.gz · Last modified: 2023/09/23 21:28 by sm5por
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