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Old 26 November 2014, 23:08   #1
Galahad/FLT
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multiple use of traps

Is constant use of traps (like the Atari ST does) a big strain on cpu resources?
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Old 27 November 2014, 09:52   #2
phx
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When comparing an OS call through TRAP with an AmigaOS call (using JSR d16(An)) then the TRAP requires approximately twice the number of cycles. Also RTE is a bit slower than RTS. The advantage of TRAP is that you switch into supervisor mode and may access protected system resources, which are otherwise unavailable in user mode (a feature which is not used on Amigas).
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Old 27 November 2014, 10:53   #3
Galahad/FLT
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Quote:
Originally Posted by phx View Post
When comparing an OS call through TRAP with an AmigaOS call (using JSR d16(An)) then the TRAP requires approximately twice the number of cycles. Also RTE is a bit slower than RTS. The advantage of TRAP is that you switch into supervisor mode and may access protected system resources, which are otherwise unavailable in user mode (a feature which is not used on Amigas).
Looks like i've got lots of code to remove then!
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