Omega Race Z80

thebman80

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Got a question I bought an Omega Race PCB and I noticed it was missing the Z80 chip. Aren't there different versions of the Z80 chip (faster processing I guess)? I know I have a Few in some Pac boards I have will they work for a replacement? If not anyone know the Z80 Number on the chip for the exact chip needed. Not sure if it matters but I thought I would ask and save myself some headaches.
 
OK...

According to MAWS (http://maws.mameworld.info/maws/) Omega Race uses 2 Z80 CPUs - one at 3MHz and one at 1.5MHz clock speed.

The standard Z80 will work.

If you can only get a Z80A or Z80B they will work fine too. They are just certified to run at higher speeds.
 
I notice on my Omega Race, that when I get past the third droid wave (not 3rd board), there's so much going on that the game noticeably lags. Would changing the Z80 to a Z80A or Z80B help with the lag?

M.O.
 
No.

They operate the same way except that the A and B are certified to operate at higher clock speeds. Plugging them into the circuit does nothing to increase the clock speed of the game.
 
Okay, so next question.. does anyone else's game lag like this, or is there something wrong with mine? Any suggestions for combating the lag?
 
OK...

According to MAWS (http://maws.mameworld.info/maws/) Omega Race uses 2 Z80 CPUs - one at 3MHz and one at 1.5MHz clock speed.

The standard Z80 will work.

If you can only get a Z80A or Z80B they will work fine too. They are just certified to run at higher speeds.

I believe the original Z80 is rated for 2.5MHz. You can push them to 3MHz, but they may not be reliable. The OR schems call for a Z80A.
If I'm going to buy Z80's I always go for the Z80B. Price difference is negligible, quality is typically better, and they'll work anywhere on classic vid boards.
 
I notice on my Omega Race, that when I get past the third droid wave (not 3rd board), there's so much going on that the game noticeably lags. Would changing the Z80 to a Z80A or Z80B help with the lag?

M.O.

They lag after the the 2nd Droid Wave, mine does it too.
 
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