How does the SGX compare to Strider's arcade PCB, the CPS?
CPS is, at least on paper, very significantly more powerful than SGX.
Some of the basics spec differences are:
CPS vs SGX
sprites: 256 vs 128
color pallete: 65,536 vs 512
max colors displayable at once: 2048 vs 482
background layers: 3 vs 2
main RAM (at least 64k if not more) vs 32K
VRAM
? (probably alot) vs 128K
CPU 16-bit 68000 @ 10 MHz vs 8-bit HuC6280A @ 7.16 MHz (not directly comparable, different architectures)
Arcade Strider ROM: around 43 megabits - SGX Strider ROM, reportedly 8 to 10 megabits.
Yet, the spec comparison does not tell the whole story because the PCE family, that includes the SGX, is much more efficient than its specs might lead one to believe.
Now also of course, Strider on CPS is not pushing the arcade hardware to even close to its limit, so that means a SGX Strider could've been reasonably close to the arcade, closer than MD/Gen.
Yet, beyond that, if NEC or any good developer programmed a totally new Strider game for SGX, some aspecs could've been better than the arcade in some ways, even though technically the SGX cannot match CPS1. It's kinda difficult to really explain what I mean well.
I'll try to give an example, Sega's Fantasy Zone arcade game: It runs on the System 16 board which is significantly more powerful than the Mega-Drive /Genesis. The MD/Gen never got a direct translation of the original game, so we cannot see how close to the arcade FZ could've been on MD/Gen. However, Sunsoft made a totally new, made-just-for-MD Super Fantasy Zone. In some ways it surpasses the original arcade. There are more layers of parallax scrolling. Arcade FZ has 2 layers.
(couldn't find one of arcade but X68K is identical) MD SFZ has at least 3 layers.
Also, the number of *hardware* background layers does not mean a system can only have that same number of layers in a game. MD/Gen has just 2 hardware layers but many games display 4 or more layers. The standard PC-Engine has just 1 layer, but games like PCE Dead Moon and PCE SCD Spriggian Mark II have many layers.
In that sense, a SGX Strider could have potentially even surpassed the arcade original. Even though SGX hardware is, absolutely, no match for CPS. Software can make hardware do things that you wouldn't believe going by just hardware specs. However, hardware specs are most certainly NOT irrelivant. Ghouls 'n Ghosts on SGX, while a great conversion, is still a big step down in graphics, and that's mainly because of the difference in hardware specs as well as ROM space. I hope that all makes sense.