If you have a flash cart then help me !!!

TmEE co.(TM) · Post by **TmEE co.(TM)** » Mon Apr 16, 2007 3:31 pm

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 !!!

LocalH · Post by **LocalH** » Mon Apr 16, 2007 6:03 pm

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.

Fonzie · Post by **Fonzie** » Mon Apr 16, 2007 7:24 pm

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?

TmEE co.(TM) · Post by **TmEE co.(TM)** » Tue Apr 17, 2007 5:26 am

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.

Fonzie · Post by **Fonzie** » Tue Apr 17, 2007 7:30 am

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.

TmEE co.(TM) · Post by **TmEE co.(TM)** » Tue Apr 17, 2007 12:28 pm

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

ElBarto · Post by **ElBarto** » Tue Apr 17, 2007 1:27 pm

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

Mask of Destiny · Post by **Mask of Destiny** » Tue Apr 17, 2007 4:21 pm

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.

TmEE co.(TM) · Post by **TmEE co.(TM)** » Wed Apr 18, 2007 5:31 am

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.

evildragon · Post by **evildragon** » Wed Apr 18, 2007 6:25 am

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

TmEE co.(TM) · Post by **TmEE co.(TM)** » Wed Apr 18, 2007 6:39 am

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.

TmEE co.(TM) · Post by **TmEE co.(TM)** » Wed Apr 18, 2007 1:39 pm

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

evildragon · Post by **evildragon** » Wed Apr 18, 2007 3:53 pm

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)

8bitwizard · Post by **8bitwizard** » Thu Apr 19, 2007 2:41 pm

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.

evildragon · Post by **evildragon** » Thu Apr 19, 2007 4:03 pm

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

Model 1, Signetics CPU: 18449

NTSC no overclock...