Anyone ever tested any of the illegal opcodes on the 7800?
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Illegal Opcodes on the 7800
Started by vdub_bobby, Apr 21 2008 10:31 AM
3 replies to this topic
#1 OFFLINE
vdub_bobby
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Quadrunner
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Posted Mon Apr 21, 2008 10:31 AM
#2 OFFLINE
bcombee
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Chopper Commander
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Posted Mon Apr 21, 2008 2:51 PM
Since 2600 games using those opcodes work on the 7800, I'm pretty confident they'll work in 7800 mode too.
#3 OFFLINE
vdub_bobby
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Posted Mon Apr 21, 2008 2:53 PM
bcombee, on Mon Apr 21, 2008 1:51 PM, said:
Since 2600 games using those opcodes work on the 7800, I'm pretty confident they'll work in 7800 mode too.
Good point! Never thought of that...
#4 OFFLINE
gdement
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Posted Wed Apr 23, 2008 4:04 AM
bcombee, on Mon Apr 21, 2008 12:51 PM, said:
Since 2600 games using those opcodes work on the 7800, I'm pretty confident they'll work in 7800 mode too.
Probably so. But it's worth pointing out that the CPU is running at a faster clock in 7800 mode, so it's always possible that unsupported instructions could become less stable at that speed.
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