SpritesMind.Net

Please test this ROM : http://www.hot.ee/tmeeco/SPDTEST.BIN on your Mega Drive, Genesis or any compatible system !!!

It will roughly measure the speed of your MD/G 68K CPU, the higher number you get, the better the performance.

My MD2 results:

Model: MK-1631-50
68000: Hitachi HD68HC000CP8

PAL, no OC : 22061
NTSC, no OC : 18464
PAL, 10MHz : 28826
NTSC, 10MHz : 24127

Note: PAL version of any particular game should always be better than its NTSC counterpart !!!

I might be able to test later with my Super Magic Drive, but I haven't had my Genesis on in a while and so I'll have to hook it up again.

And yeah, PAL systems get more cycles per frame but less frames per second. I'm not sure if the Genny is the same way, but the NTSC C64 is actually slightly faster than the PAL C64 in terms of raw CPU speed, even though PAL systems can do more before the next frame starts.

Yeah, i thought it was same for megadrive, isnt the 68K clock different between pal and ntsc?

Of course, this would explain why some NTSC game running on a PAL system (switched to 60hz) would slowdown miserably because the cpu is too slow...

Any idea?

The difference in clock is very slight ~0.06MHz. I want to see the numbers of NTSC system, how much is the difference.
PAL has less frames per second, but if a game is programmed for PAL, it will be superior to NTSC version, due to the fact, that less ints/sec provides around 1MHz of extra speed comparing with NTSC system. As much I have played various games in PAL config, they won't lag, or lag very slightly. Start sonic3 in PAL, and switch to NTSC then, you'll see what happens if game uses all the gap between 2 frames. NTSC game in PAL would slow down as it is not meant to be played at 50Hz, hence the slowdown, but it won't lag.

ok good
I told you that because my momad don't run @ 60hz some games properly :
PAL Light crusader => wierd crash during EVERY boss battle
PAL Sonic1 or 2 (i don't remember) => Horrible lag (like missing one frame out of two) at some points.

Its maybe because of the 0.06mhz, i did know it was a so little difference, who knows ^^.

Yeah, in MightyMightyMissile, i had to develop the game on ntsc first to be sure it was ok on both.

Has anyone tried my proggy ? I'm very interested in these numbers, especially on more exotic systems like Fonzie's Nomad

Will test it tonight on my md1 eur, md1 jap, md2 eur, md2 jap and my X-Eye.

So I take it this is more or less performance per frame/field rather than per second?

Any chance you could make the source available? I should be able to test it using my Sega CD and transfer cable if you do.

More performance per frame and eventually second.

Source is very simple, core is little over 10 lines. When I get home I'll make it available.

i don't have a flash cart.. can you make it executable on the Sega Loader?

I don't have SCD/MCD yet, and I haven't mastered MD yet, so there won't be any such version When I make its source available, MoD will make something out of it, so you can upload it to MCD/SCD through his transfer suite.

Here's the source : http://www.hot.ee/tmeeco/SPDTEST.ASM
Have fun

thanks i'll try and get it ported to the SCD... (if i can figure it out, i still haven't gotten one thing to run on the Sega Loader yet, all I can get it to do is restart to the SCD BIOS screen)

Finally tested it on my 1601.

Motorola CPU, NTSC, either 18462 or 18463 with multiple resets.

Good thing I had a photo of it opened or I would have had to take a lot of time to open it to verify the CPU type.

ok, someone let me borrow a flash cart for now..

Model 1, Signetics CPU: 18449

NTSC no overclock...