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Post by donno128 on Apr 21, 2015 20:47:47 GMT
I have some unflippy disks, that is, 1541 disks that are two sided but you don't flip them. The second side can only be used on a 1571 in 1541 mode with h1 enabled via "u0>m0" and "u0>h1". They are handy for not having to flip over a disk, or increasing storage without having to notch the disk and have it spin backwards when you turn it over as on the 1541 or other single sided drives. Or hiding information on the second side from 1541 drives and such. So I tried to create one in VICE X128. No luck. Created a 1571 image, then tried forcing 1541 mode and formatting the second side to try to get a usable image on the second side via m0 and h1 thinking I would then reformat the first side. I guess it can't be done? It works in the real world on real hardware but on the emulator I cannot archive my disks as .dxx images that would work as two side in unit 8. Maybe just use opencbm and DOS commands would work for the transfer but would VICE recognize it and if so how? Does anyone know?
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Post by donno128 on Apr 21, 2015 20:31:37 GMT
Just to see what would happen I used the x[up arrow]2 instead of multiplying by x*x... much slower if just squaring. If we go to 3rd or 4th power we get more equal speed, then above that the power function is faster than just multiplying using x*x(*x*x ad infinitum). There are some odd differences depending on what number we are raising to a power too. Which raises a question: are some functions and calculations faster on different CBM 8bits? I think the power function has some initial overhead that slows it down with simpler raising of powers of small integers.
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Post by donno128 on Apr 21, 2015 20:14:19 GMT
I like it. Looking forward to the day... Also, the link to the remastered Ultima IV by Mager Valp. Niiiice!
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Post by donno128 on Apr 21, 2015 19:52:29 GMT
I almost lost my 1571 to a bad original disk of Chessmaster 2100. On further inspection the disk was just rusting... losing the magnetic medium as dust... ack!! Head cleaning and resetting the drive head worked. I never clean the heads except if something bad happens. They don't need it. Unless they stop working. It's usually disk speed or the heads got banged out of place by an overheated 1541.
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Post by donno128 on Apr 17, 2015 16:04:51 GMT
Counting jiffies via TI, he used the op's program.
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Post by donno128 on Apr 12, 2015 16:32:35 GMT
$25 for the promise a light bulb might work 24 years from now? Not a good bet on any level. For instance, I would be 88. i may move 3 or 4 more times. Am I taking the bulb with me? Then again, I've never seen these promises of how well new technology will work and last be accurate. My new style efficient high intensity sodium ight bulbs have not lasted as advertised. So far, it seems they last about 20% of the time advertised.... CDs were supposed to last forever. They get bitrot and pick up atmospheric impurities and go bad. And they are becoming hard to find and replace. On the other hand, my C128 is 30 years old, as are the three 15xx series disk drives... who would have thought these would function 30 years later? The floppies are lasting better than 30 year old compact disks, that's for sure. And... It's about as easy to get new DSDD disks as compact disks. Finally, I agree, my general sentiment is GE does suck. The newer light bulbs are a scam to extract extra money from the general populace up front. Yeah, the old ones are inefficient for lighting, but they produce heat, which comes in handy in the winter.
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Post by donno128 on Apr 6, 2015 18:48:48 GMT
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Post by donno128 on Mar 31, 2015 17:09:33 GMT
I have a 1750, I installed a socket and haven't had any problems using eproms in it. Right now I just have the KEYDOS ROM installed since it's the only one I use with the REU. When I installed the socket I also put pins in the jumper points so I could use small jumpers to adjust the settings (no more (de)soldering jumpers). BTW: My REU has the long REC not the square one. Nice idea with the pins. I think mine has the square one. I'd have to look to be sure. Does it make a difference which REC is in there?
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Post by donno128 on Mar 31, 2015 16:17:08 GMT
TRON
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Post by donno128 on Mar 28, 2015 19:02:35 GMT
Thanks, Hydro... for your pokes which I did not know of and the Plus/4 mention reminded me to check xplus4...
The Plus/4 is slower as an NTSC machine, faster as PAL. In VICE Plus/4 bendevil's prg results: NTSC=89 PAL=64 There are pokes to speed up NTSC Plus/4. I can't remember what they are. One is to put an NTSC in PAL mode. The Plus/4 goes at 1.77Mhz during borders and 0.88Mhz for screen draws.
It would be interesting to try the other good Plus/4 emulators and see if they produce the same results.
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