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Commodore Business Machines and their products. Use more specific tags like [commodore-64] or [amiga] instead if appropriate.

6 votes
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Benchmark between Home computers? What can be a valid parameter for that?

If your focus is on Commodore products from 1977 to 1984, then MIPS would likely be the wrong way to differentiate. … It wasn't until 1985, with the Commodore 128, that the 8502 (upgraded 6502) could run at 2 MHz, and even could drive an 80-column monitor. …
RichF's user avatar
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64 votes
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Why did Commodore fill their power supplies with epoxy?

[ref] Perhaps the cause of the high failure rate is that Commodore engineers decided they could use cheaper components to build the power supplies, depending on the epoxy properties to balance out any … In 2012 Bil Herd (Commodore engineer) speculated: They were made for CBM by the boatload, they got warm and were not rated for things like the CBM cartridge [Bil probably meant CP/M cartridge], etc …
RichF's user avatar
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18 votes

Why does the Commodore C128 perform poorly when running CP/M?

My first answer attempts to answer all the OP's questions without going too deep into the hardware details. Since posting that answer, I have had the pleasure of corresponding for several days with Bi …
RichF's user avatar
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47 votes

Why does the Commodore C128 perform poorly when running CP/M?

From the Commodore 128 Programmer's Reference Guide (PRG), page 500: The 8502 is responsible for most of the low-level I/O functions. … I'm sure Commodore didn't want to spend extra money to optimize a feature they hadn't even asked for. …
RichF's user avatar
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