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===ATA port (SCPH-700xx and earlier)===
===ATA port (SCPH-700xx and earlier)===
The ATA port was removed alongside the expansion bay. Despite this, the SCPH-700xx had the necessary hardware and ATA pins required to solder an HDD connection to the motherboard, effectively rendering the port completely removed in model SCPH-750xx onward.
ATA port was in theory removed with removing Expansion Bay.
 
But in SCPH-700xx (first slim model) Sony leaved hardware, and ATA pins required to connect HDD on motherboard.
 
So ATA port was really removed in SCPH-750xx and later.


===IOP (aka MIPS R3000A/PS1 CPU) (SCPH-700xx and earlier) ===
===IOP (aka MIPS R3000A/PS1 CPU) (SCPH-700xx and earlier) ===
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This resulted in some minor, or major compatibility issues for PS1/PS2 game titles.
This resulted in some minor, or major compatibility issues for PS1/PS2 game titles.


===System and DVD player update ability (SCPH-900xx with BIOS v2.20 and earlier)===
===System/DVD update ability (SCPH-900xx with BIOS v2.20 and earlier)===
In BIOS v2.30 and v2.50, Sony removed support for system update via memory card to block FMCB exploit.
In BIOS v2.30 and v2.50 Sony removed support for system update software via memory card to block FMCB exploit.


The system update exploit used this ability to inject own code into console RAM, and allow to run custom code that way.
The system update exploit used this ability to inject own code into console RAM, and allow to run custom code that way.


It also removed support for DVD player update via memory card.
It also removed support for DVD update software via memory card.


BIOS v2.30 can be found in majority of SCPH-900xx units, while BIOS v2.50 can only found in Europe-only KDL-22PX300 Bravia units.
BIOS v2.30 can be found in majority of SCPH-900xx units, while BIOS v2.50 can only found in Europe-only KDL-22PX300 Bravia units.
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This feature was removed in SCPH-3000x and later.
This feature was removed in SCPH-3000x and later.


===Buggy DVD Player 1.00J (SCPH-10000 with BIOS v1.00)===
===Buggy DVD Player v1.00J (SCPH-10000 with BIOS v1.00) ===
This update was blocked in SCPH-10000/15000 with BIOS v1.01 and later.
This update was blocked in SCPH-10000/15000 with BIOS v1.01 and later.
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