find info about Xplorer FX3 cart

[megavolt85]

Hi all.
i'm find technical information about Xplorer FX3 cheat cartridge

what i know:

ROM 512KB (2x256 KB)
SRAM 128KB

Address space

xx000000h
          ROM 256 KB
xx040000h
          ROM 128 KB two bank switchable (SRAM?)
xx060000h
          Registrs
xx080000h

*xx = 1F, 9F, BF

Registrs:

1F060000h R/- 
          bit 0 - ON/OFF switch

1F060001h R/W
          read
          bit 8-0 - DATA PC Link
          write
          bit 5  - ROM2 bank switch
          bit 3-0 - DATA PC Link

1F060002h R/-
          bit 0 - DATA PC Link handshake

What don't know:
1) where mapped SRAM
2) if SRAM not mapped initially, then what is register used for a mapping

I can only assume that SRAM is available on the addresses xx040000h-xx05FFFFh, for mapping use bit 4 of register 1F060001h

 

[danhans42]

Look in the nocash psx info document if you haven't already.. quite a bit on the Xplorer in there such as how SRAM is mapped and also about how to write to both banks and how to communicate via parallel.

Nocash PSX Specifications

 

[pool7]

You can also check out and ask in psxdev.net; there were several discussions around XplorerFX carts there.

 

[megavolt85]

Look in the nocash psx info document

thanks, I found everything that wanted

You can also check out and ask in psxdev.net

on psxdev of a little technical information about cheat cartridges, everything that there is to me already was known

on the available information it is possible to recreate Xplorer FX, the truth because of unknown registers 1F060005h-1F060007h the copy will not be compatible with SW v4.52

 

[megavolt85]

Xplorer FX schematic diagram

 

[muramasa]

Xplorer FX schematic diagram

View attachment 2108

Where did you get this schematic?

 

[megavolt85]

Where did you get this schematic?

I studied registers and according to them drew the scheme

 

[danhans42]

Excellent, so you have decoded the pal/gal into 74series logic?

Great work

 

[megavolt85]

so you have decoded the pal/gal into 74series logic?

yep

 

[danhans42]

Fantastic. I wanted to try and recreate this on a modern cpld so will be very helpful. Great work

 

[muramasa]

Awesome! I wondered if it was something like that. I thought it would be cool to make an Xplorer but with the USB project built in. I was thinking that figuring out the PAL would take a while.

 

[megavolt85]

I am going to connect an USB disk
it is also necessary to add connection to the PC, but the Xplorer protocol is not pleasant to me, transfer on three bits for one cycle is very slow