Dreamcast Ovecloking
реклама
This is the DC before the disassembling. (In its carp state on the cutting board. (Laughing))
To be the left inner part, can measure PLL-IC and the terminal with the frequency counter and can verify.
(кликните для увеличения)
After disassembly
(кликните для увеличения)
To here because the person whom it is not possible reads, abandoning, they will do. . . . (Because of sense)
Becoming independent in every CD-ROM power source main motherboard modem interface board, and each part being to be able to disassemble maintainability (disassembly characteristic modifying characteristic?) It is satisfactory.
It is rise of the DC motherboard .
You looked at the various motherboard photographs on the net, but layout is somewhat different depending upon production time, but almost similar.
The tip/chip where the center is large video POWER VR2, the tip/chip where that right side is a little small is CPU SH-4.
When you inspect also the power source basis of DC, it is 12V 5V 3.3V
(As for 3.3V it is not in power source of the personal computer, but it is made on the DC motherboard.)
(кликните для увеличения)
The specifications of DC collating, when you look at the PDF data, this SH-4 seems that with the input of 33.33Mhz is operational at internal magnification ratio 6 time 200Mhz. Because magnification ratio seems like fixing, if 33.33Mhz of input is increased, you can increase overall clockspeed.
When (you look at the data, the clock while operating there is a mode which is dropped. Windows CE and the like for Mobile installation?)
(In case of place t Shaun's clock rise, something related to sound clock rise? It did, but in case of SH-4, being inside to build in the timer-related clock in another circuit, it may be possible somehow)
Promptly, on the motherboard, the crystal of 33.33Mhz was looked for, but it is not found.
The package is not QFP (the type where the pin has appeared in the tip/chip 4 side), it was the difficult BGA (the pin not to have come out, to be connected in the motherboard and the tip/chip underside) being the external clock input pin to find.
You looked for a while, but when you see carefully, being the same as personal computer case, you use PLL-IC.
Here, is rise of the PLL-IC section of problem.
When you inspect with the frequency counter, 13.5Mhz being crystal, the signal which it dispatches being done, dividing it is expanded,33.33Mhz 54.00Mhz is made.
(With mere crystal modification, being linked 33.33Mhz 54.00Mhz both, frequency changes.)
(кликните для увеличения)
(кликните по картинке для увеличения)
When to be easy to understand it makes the figure, it becomes like this.
You inspected with the net, (in regard to the details other things but you did not understand. It seems like custom Integrated Circuit.)
If you understand to here, if more detailed one whether simplicity you think.
(кликните по картинке для увеличения)
It is the crystal oscillograph group which this time is prepared.
(Frequency variable if there is an oscillograph which it is possible it is best.)
The variety while playing, it increased. (Laughing)
Those which are purchased anew and those etc. are removed from the junk item etc. which. . . .
In case of the personal computer, in order generally to increase the operation time of the game and the like,
Frequency of 1 CPU is increased.
Frequency of the 2 video tip/chip is increased.
3 memory-related access speed is increased.
The 1 is simple discernment solution. In regard to 2, it is not known unexpectedly, but it is effective.
It is related 3 to the 1, but DC is not easy different from the personal computer.
(Being linked to the 1, it means to rise.)
(кликните для увеличения)
emporarily, doing the foot lifting of PLL-IC, it tries inputting another clock.
The PLL-IC section exactly is under the truth of the power source section.
Because power source removal and re-installation every test is difficult, temporary cord/code connection is made from the motherboard connector.
With this the test, becomes easier.
60Mhz is supplied in place of the clock which is thought as relation of the video of 54.00Mhz.
It tries turning on power with somehow it seems that is moving, but the picture flows. (Sound is normal)
After all, also frequency of the video signal being linked, it seems that rises.
Like the personal computer monitor because frequency following cannot do TV, this method is abandonment.
If (selling separately VGA - you connect to the personal computer monitor by way of the BOX, perhaps. it appears)
It tries inputting 36Mhz to the CPU input clock of 33.33Mhz, next.(36.00Mhz Ч 6 = 216Mhz operations)
In this state, it seems that moves without problem temporarily. (Also sound is normal)
The result of spare experiment, two you can think the method of clock rise.
Cutting off A 33.33Mhz, directly from another oscillograph it supplies the clock to CPU.
The clock for CPU is modified indirectly with B PLL-IC crystal modification.
(Cutting off 54.00Mhz, from the oscillograph in relation of video 54.00Mhz supply)
This time, it did to the thing where the numbers of parts few take the method of A which is simple.
It is problem here. It designates the clock which is supplied to CPU as somewhat is.
Case of the personal computer, increasing to the limit, after the verifying, it makes the clock which a little can give room.
In case of DC, if the software whose processing is heavy moves smoothly, being to be OK with that, it is not necessary to move unreasonably.
In case of the personal computer, the new software requires the high specifications steadily, but in case of DC hard ability is fixing.
(Because be too heavy the software does not become the game, it cannot ship the software manufacturer and, adjusting, there is no hindrance it does in play.)
The picture being clean, because the movement as for smooth, is the request which is contrary any world, as for the software manufacturer it is the meaning which suffers hardship in adjustment, but the picture the movement being good, because the eye which was seen with plainness, at the rival machine rival manufacturer share is taken, closing the eye a little, the fact that it has sold is present condition.
This time, "capital city high battle 2 " the level which moves without stress is goal.
(кликните для увеличения)
The pin foot lifting processing of PLL-IC is locked in order to decide the clock.
The foot the cord/code is attached to pattern of the pin and the baseplate of PLL-IC which was lifted.
Because with just the solder there is an insecurity in strength,the cord/code is locked at the hot bond.
Because (generality, the stranded wire of the cord/code is dangerous, be sure to use the single core cord/code.)
In order to decide the clock, connecting CD-ROM, it does actual operation check.
(While operating, CD-ROM high being to turn above expecting, note is necessary.)
As for リプレイ whose processing is heavy, being SAVE not to be done in visual memory, with who? You verify in the demonstration play immediately after the power source throwing which you can verify.
(кликните для увеличения)
Скоро все это проделаю на собтвенном опыте
реклама
Лента материалов
Соблюдение Правил конференции строго обязательно!
Флуд, флейм и оффтоп преследуются по всей строгости закона!
Комментарии, содержащие оскорбления, нецензурные выражения (в т.ч. замаскированный мат), экстремистские высказывания, рекламу и спам, удаляются независимо от содержимого, а к их авторам могут применяться меры вплоть до запрета написания комментариев и, в случае написания комментария через социальные сети, жалобы в администрацию данной сети.
Сейчас обсуждают