DTL H2000 hardware reverse engineering

On the DTL-H2000, the SBUS of the PlayStation has several buffers and level translators, unlike the retail hardware. Tracing through it is therefore a bit more difficult.

The most important piece of information however is probably the pinout of the 100 pins bridge over the two cards. Note that most of these signals won't go directly to their respective devices, but instead will go over level translators. These will be noted in the table below.

signal	CPU tr pin	translator	br tr pin	br pin	br tr pin	translator	PIO tr pin
GND				1
GND				2
GND				10
GND				15
GND				20
GND				25
GND				30
GND				40
GND				45
GND				50
GND				55
GND				59
!RESET	11	U65	38	67	8	U737	41
GND				69
GND				78
GND				80
GND				84
GND				88
GND				90
GND				99
GND				100