Dave's Genesis Tests
A great way to improve emulators is to run code
experiments on the real machine and make sure they act the same way as
on the emulators.
If you have a Genesis and a backup device (which allows
files to be moved between a Genesis and a PC),
you can help out by running these Roms on the Genesis, and letting
me know what you see
(e-mail to dave@dtmnt.com).
Thank you!!
(Note that Exp numbers aren't necessarily in order or sequential
since some don't get released. Fortunately they are uniquely numbered!)
Experiment 4B
Description:
Attempts to measures the hvcounter at the time that the
v-interrupt happens. (4B: Slowed it down so it's easier to read.)
Results (emus)
On most emus the value is about E000-E200.
Results (real genesis)
Brazilian genesis: E024-E035.
Canadian genesis: it usually is E030
the 3 is pretty stable, while the last digit is running through numbers.
Italian Genesis:
The value is: E03x
x = value from 0 to F (i think... it's flipped too fast to see)
The value of 3 is stable for most of the time but changes
(either to 4 or 5... too fast to see which!)
|
|
Experiment 2
Description:
Attempts to measures the hvcounter at the time that the
v-interrupt happens.
The left counter is the hvcounter, and the right counter
is a V-int count.
Results (emus)
On most emus the value is about e000-e200.
Results (real genesis)
On a real Genesis the left counter is random, and the right counter
sounds like it goes up far too fast.
Sounds like I messed up my code! I'll try rewriting it in exp4.
If you are sending results, it also helps to know what kind of Genesis you have.
Let me know as much information as you can (e.g. which country
you bought it in, whether it's a Megadrive 2, or a Nomad).
visitors
Thanks for all your help!
Back to DGen page