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- #REPAIR PS1 CONTROLLER WIRE HOW TO#
- #REPAIR PS1 CONTROLLER WIRE SERIAL#
- #REPAIR PS1 CONTROLLER WIRE CODE#
#REPAIR PS1 CONTROLLER WIRE SERIAL#
Of course, the actual implemention depends on what hardware you are using to receive the data (=something that supports serial RX/TX at 3.5V levels). I can supply more info on the wiring (basicially that's just the above 4 pins), and on the protocol/software. Hope some people will dump some more cdrom bioses! There are probably around 20 different versions (at least five revisions, for each of the three regions, plus devrs versions). But anyways, after all, it did work fine! nonetheless I broke some connections 1-2 times. I ended up using some strings pulled from a flexible wire, attaching that hair-fine strings to the chip, and then connected normal/bigger wires to the strings - and tried to stop breathing and moving. It's a bit challenging because the SMD chip is having really tiny pins, and no solder pads/test points on PSone boards. The soldering stuff is relative simple & relative difficult: Basically one does need only four wires connected to the chip (two constant voltages: Pin17=3.5V, Pin31=7.5V, and two data lines: Pin50=TX and Pin51=RX with 3.5V levels each). Maybe it'd be worth writing a custom highspeed dumping function (the programming efforts can't be more time consuming than using the original selfdump function).
#REPAIR PS1 CONTROLLER WIRE CODE#
Though there's also a upload & execute custom code function, that way one could transfer bytes in 10bits, and possibly even using something faster than 10000 baud. around 15 minutes to dump the whole 64Kbytes address space).įor error checking purposes, I've dumped it four times, which was really time consuming. The selfdump function is sending data in ASCII format, including spaces and linebreaks and 4-digit address for each byte, plus a request/echo pair for each byte - that looks nice when seeing the data arrive for the first time - but it's also endless slow (in total it takes around 130 bits per byte (ie. older PSX with 4.000MHz oscillator would transfer data at 9600 baud, and PSone transfers data at 10000 baud (apparently derived from around 4.19MHz clock source).
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The PSone is using identical protocol (with same baudrate constants, ie. The actual data transfer protocol wasn't documented in datasheets, but the decapped PSX/NTSC cdrom controller revealed it's inner workings.
#REPAIR PS1 CONTROLLER WIRE HOW TO#
The way how to enter the selftest mode was more or less described in HC05 datasheets (which were a bit unclear since some sections suggested pulling PortC.7 to 2xVCC, and others said PortC.6, which made me feel uneasy, since one should probably avoid strapping the wrong pin to +7V) (anyways, it turned out to be C.7, aka Pin31).Īnd the datasheet contained some weird drawing that looked like a distorted timing diagram (which turned out to be totally meaningless, the PortC pins can be constant before+during+after /RESET). That's been done using Motorola's build-in self-dumping function.
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I've dumped the PSone/PAL CDROM controller BIOS last night, CRC32=2669A1A7h for the 16.5Kbyte ROM-image (IC304 52pin, chip name: "C 3060, SC430943PB, G63C 185, SS0L0130E").