Thanks Gerrit, Yes I only have the die shot of 8360R2 so if you could send me the 8360R1 die shot that would be great! I have one 8360R1 which just died recently with keyboard latch problem. Some keys are not working so I cannot measure its behavior anymore. How do you stick the DIP cooler on top of the IC? Do you use a glue or just a heat paste? Active cooling needs some investigation because it requires a very small fan... Thanks Istvan -------------------------------------------------- From: "Gerrit Heitsch" <firstname.lastname@example.org> Sent: Thursday, November 06, 2014 8:17 PM To: <email@example.com> Subject: Re: TED bug? > On 11/06/2014 08:04 PM, Istvan Hegedus wrote: >> Hi, >> >>> >>> I haven't seen this problem, but may I ask why you'd want to use the >>> STOP bit at all? If you want better than normal speed, just allow TED >>> to double clock the CPU and disable the display. This should run the >>> CPU on double clock all the time (except the 5 refresh cycles per >>> scanline). You only get to see the border color though. >> >> Yes I know this is better way for speeding up calculation. I don't want >> to use TED stop just investigating how it works. >> I am collecting information on TED for a future project... > > You've seen the die shot of a 8360R1 TED? I could mail it to you if you > don't have it yet. Might give you some insights. > > Also remember that 2 of the keyboard latch pins are used for testing when > pulled to 10V. At least that's what they were on the 7360, don't know if > they kept it in the 8360 so be careful. > > K0: Freeze the system, switch to single clock, DRAM refresh. > K1: Force clock division to NTSC. > > K0 looks like the STOP bit triggered externally. > > > >>> If you're on a PAL system and want even better speed while not caring >>> about the video output at all, disable the display and then switch TED >>> to NTSC. This changes the clock divider from 10 to 8 which will run >>> the CPU on a PAL system on about 2.2 MHz. This assumes that the rest >>> of the system can keep up and the CPU is well cooled... >> >> Good idea, I will try it after I installed DIP cooler to the CPU. > > I would also suggest some aktive cooling since the 8501-CPUs are becoming > increasingly rare. > > Back in 1986 I had the CPU cooled with a DIP cooler and used that trick to > speed up calculations by quite a bit (well, about double speed compared to > the standard setting of visible screen and double clocking during the > border) > > If you don't have them yet: > > http://www.pagetable.com/docs/ted/ > > > > Gerrit > > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2014-11-07 08:00:03
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