The Apple IIGS Megahertz Myth
owl writes:
https://www.userlandia.com/home/iigs-mhz-myth
There's many legends in computer history. But a legend is nothing but a story. Someone tells it, someone else remembers it, and everybody passes it on. And the Apple IIGS has a legend all its own. Here, in Userlandia, we're going to bust some megahertz myths.
I love the Apple IIGS. It's the fabulous home computer you'd have to be crazy to hate. One look at its spec sheet will tell you why. The Ensoniq synthesizer chip brings 32 voices of polyphonic power to the desktop. Apple's Video Graphics Controller paints beautiful on-screen pictures from a palette of thousands of colors. Seven slots and seven ports provide plenty of potential for powerful peripherals. These ingredients make a great recipe for a succulent home computer. But you can't forget the most central ingredient: the central processing unit. It's a GTE 65SC816 clocked at 2.8 MHz-about 2.72 times faster than an Apple IIe. When the IIGS launched in September 1986 its contemporaries were systems like the Atari 1040ST, the Commodore Amiga 1000, and of course Apple's own Macintosh Plus. These machines all sported a Motorola 68000 clocked between 7 and 8 MHz. If I know anything about which number is bigger than the other number, I'd say that Motorola's CPU is faster.
"Now hold on there," you say! "Megahertz is just the clock speed of the chip-it says nothing about how many instructions are actually executed during those cycles, let alone the time spent reading and writing to RAM!" And you know what, that's true! The Apple II and Commodore 64 with their 6502 and 6510 CPUs clocked at 1 MHz could trade blows with Z80 powered computers running at three times the clock speed. And the IIGS had the 6502's 16-bit descendant: the 65C816. Steve Wozniak thought Western Design Center had something special with that chip.
And so the story begins...
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