Search found 8 matches

by LordHexahedron
April 23rd, 2016, 6:01 pm
Forum: Hardware
Topic: [7501] SIMM EDO RAM Upgrade?
Replies: 18
Views: 29064

Re: [7501] SIMM EDO RAM Upgrade?

NOT the expansion space addressing. The DRAM bus (shown in the above image) has 12pin address bus, 2pin RAS (two banks), 4pin CAS (for selecting the four 8bit-fragments on the 32bit databus). Theoretically, that should give an address space of max 2x12+1+2 = 27bits = 128Mbyte. But the number of pin...
by LordHexahedron
April 22nd, 2016, 12:07 pm
Forum: Hardware
Topic: [7501] SIMM EDO RAM Upgrade?
Replies: 18
Views: 29064

Re: [7501] SIMM EDO RAM Upgrade?

Yes the PSX can handle 16 MB, but you'll need to modify the BIOS for starters. Are you sure? I thought that port 1F801060h can be set to max 8MB, and addresses above that limit would always trigger memory exceptions. Or did I got that wrong, or is there a way to disable that exceptions somehow? Not...
by LordHexahedron
April 21st, 2016, 10:17 am
Forum: Hardware
Topic: [HELP] Bricked PS1
Replies: 12
Views: 25046

Re: [HELP] Bricked PS1

Oh yes, I did some more research - if you don't trust random knockoff chinese fuses (I don't blame you, I don't either) then perhaps the more reputable Bel C1F 750 - it's within spec, although it'll look off. But it doesn't matter much if the fuse looks off, still looks better than bodging in a thro...
by LordHexahedron
April 9th, 2016, 12:14 pm
Forum: Hardware
Topic: [HELP] Bricked PS1
Replies: 12
Views: 25046

Re: [HELP] Bricked PS1

I don't know for a fact, I could never find any data on the PS605 fuse (sony part, not available to consumers - no datasheet to be found) so I had to trust forum posts on it - someone allegedly measured it to be 400mA and when they replaced it with a 400mA fuse it worked without breaking. the CCP2E1...
by LordHexahedron
April 8th, 2016, 4:13 am
Forum: Hardware
Topic: PAL PS1 Power Boards in NTSC-J & U.S. Consoles...is it safe?
Replies: 3
Views: 7615

Re: PAL PS1 Power Boards in NTSC-J & U.S. Consoles...is it s

it wouldn't be a fire hazard, the mainboards are virtually identical and the power supply boards just does AC to DC rectifying and step down transforming to the required 12V, so long the power supply board matches the input voltage its' fine.
by LordHexahedron
April 8th, 2016, 4:07 am
Forum: Hardware
Topic: Modding My PS1
Replies: 9
Views: 19995

Re: Modding My PS1

12C508*... that's an MM3 stealth chip [well, it should be - I can't guarantee it 100% without popping it in my EEPROM programmer and dumping the image], it'll work with even modchip aware games (unless there are other chips that use the same PIC, but 4 wire 12C508 sounds like MM3 to me). *yes, that'...
by LordHexahedron
April 8th, 2016, 4:04 am
Forum: Hardware
Topic: [HELP] Bricked PS1
Replies: 12
Views: 25046

Re: [HELP] Bricked PS1

It's a 0.4A fuse and not a 1A fuse. Pretty much any 0.4A fuse will do if you can get it in there without bridging anything. the only 1A+ fuses are in the power supply board (and in the relatively high current section of the mainboard) but the green light coming on indicates the problem to be elsewhe...
by LordHexahedron
April 8th, 2016, 3:51 am
Forum: Hardware
Topic: Best modchip ?
Replies: 11
Views: 17472

Re: Best modchip ?

I have personally had great success with MM3 chips (you can either flash them yourself using the OpenMM3 firmware dump or buy them from eurasia here's a link for your convenience (US version, if your location is any indication you probably want the PAL version!) ) it works with every model up to SCP...