> Raiden and Aero Fighter are one of the best scroll up
> shooter of all times.

Opinion.

> Raiden is currently supported in the extra large build,
> but due to this game use 5 CPU it does run very slow.

Raiden has two V30 CPUs (each at 19MHz) to emulate, just to
play the game. There is also a Z80 CPU at about 3.5MHz which runs the sound hardware. Sound hardware consists of a
YM-3812 and an OKI6295, which are NOT CPUs

> But Aero fighter only use 3 CPU (2 for the game and 1 for
> the sound)

Aero Fighters uses a single Motorola 68000 CPU at 10MHz to
run the game. The Z80 at 4MHz is for audio-only, and the
sound hardware is a YM-2610.

> almost like the 1943 (although 1943 has 4 CPU,
> but runs very nice)

1943 runs on a single Z80 CPU at 6MHz. The second Z80 (3MHz) is only for sound, and a couple of Yamaha synthiser
chips are thrown in as sound hardware.
Now we have all the facts straight.

>I think that this game will run
> smooth in Pocket PC.

How well anything runs depends on the hardware of the device, not at all on the operating system.
I think it will not run smooth even on the currently-most-powerful CE3.0 device (iPaq).
Even with sound disabled and underclocking the Z80, 1943 is
not able to mantain full frame-rate on an iPaq.
A 68000 CPU is 16-bit vs the Z80 which is a 8-bit CPU.
It has a much more complicated instruction set and can
access much more memory. Emulating it is more involved than
emulating a Z80. And finally, CPU(s) are far from all that
will affect the speed of a game (although it is usually
the biggest factor in early 80s games). Emulation of the
video hardware, espicially in games from the mid-to-late 80s
on, can be quite complicated and time-consuming.

Bottom line: Aerofighters would be slow as sh*t on an iPaq, although perhaps not quite as slow as Raiden.

Darren