On 02/03/2013 07:41 PM, Gábor Lénárt wrote: > > Maybe, however I have two of them, so I believe in my luck. I have even > found an older mail here about the heating problem (a not needed resistor on > the mask of the CPU or so?), but since I would drive the CPU at a constantly > 1MHz clock (afaik in C16/Plus4 it is clocked at 1.76MHz during the TED > video blanking periods), I guess I won't fry it if they managed to survive > their lifespan in their original place (Commodore 16) ;-) Add a heatsink. There are 3 main reasons for a deas 264 system.. CPU, TED and PLA. > The test circuit has UM6502 currently, so > some modification is needed, I guess (I even don't know if 8501 needs two > phase clock or not, etc). The 8501 needs only PHI0. But, in order for R/_W to work properly, you also need to supply a clock signal to the GATE IN pin. In the C16, they use the MUX-signal for that. > Well, yes, just I thought that maybe 8501 is not stable enough to run > constantly at 1.7MHz clock. It is... And if you know how, you can even overclock it to about 2.2 MHz by setting TED to NTSC while using a PAL crystal. You won't get a usable video output, but the system will run. I did have a heatsink on the 8501 when I did that though. Also, the 7805 was no longer inside the C16 when I did it, so the system was running less hot. > I am just curious here, this is one reason I would love to see > the "official" MOS 8501 specification/datasheet. So am I, but I haven't seen a datasheet for the 8501 anywhere. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2013-02-03 19:00:37
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