PlayStation Development Network

I'm setting up bios in OpenEmu which took me here (http://www.psxdev.net/forum/viewtopic.php?t=56) and noticed a similarity in identical bios claims which I'd already confirmed (that you hadn't confirmed) and decided to check the others too for you, as well as one that OpenEmu has listed that you don't. I used the files you have available for download in all of these checks.

- The SCPH-7002 is actually just a SCPH-9002
SCPH-7002 MD5: b9d9a0286c33dc6b7237bb13cd46fdee
SCPH-9002 MD5: b9d9a0286c33dc6b7237bb13cd46fdee

- The SCPH-7003 is actually just a SCPH-5501
SCPH-7003 MD5: 490f666e1afb15b7362b406ed1cea246
SCPH-5501 MD5: 490f666e1afb15b7362b406ed1cea246

- The SCPH-5552 is actually just a SCPH-5502
SCPH-5552 MD5: 32736f17079d0b2b7024407c39bd3050
SCPH-5502 MD5: 32736f17079d0b2b7024407c39bd3050

Yes, it is somewhat known that some identical BIOS images got used on different console models.
Additionally, some console revisions got released with older motherboards installed, yet named like a new one.
This is probably the case with your 7003 vs the 5501.

That said, the 7002 vs 9002 is rather odd. Their release dates are about 2 years apart and the chipset had changed quite a bit, especially on the CD controller.

In general, all the SCPH-xxx3 consoles had the same boot ROM as the equivalent SCPH-xxx1 versions, since they were NTSC and had an English menu. Most of the SCPH-7003s have PU-18s in them, presumably using up boards left over from the SCPH-5503 production in the new bundle with the Dual Shock controller. Some of the later production ones were PU-20, although they hit the market far later than the PU-20 based Japanese SCPH-7000 units.

The SCPH-5502 and the SCPH-5552 are exactly the same console. The difference in part number is that the 5502 was shipped with a single digital controller and the 5552 was shipped with two digital controllers and a memory card (AKA "Value Pack").