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Old 10 November 2018, 14:00   #18
patrik
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Join Date: Jan 2005
Location: UmeƄ
Age: 38
Posts: 482
Quote:
Originally Posted by alexh View Post
If i had one I'd tell you but zorro ii is about 3.8MB/s theoretical max and trifecta was in magazines quoted at 10MB/s with phrases like "hidden DMA transfers"
To be nitpicking, for a PAL A2000, it would be:
Motherboard oscillator frequency = 28.37516MHz
Zorro2(68000)-bus frequency = 28.37516MHz / 4 = 7.09379MHz = 7093790Hz
Zorro2(68000)-bus Bytes per transfer = 16bits / 8 = 2Bytes
Zorro2(68000)-bus cycles required for one transfer = 4

Theoretical bus speed = (7093790 * 2Bytes) / 4 = 3546895Bytes/sec = 3546895Bytes/sec / 1048576 = 3.38MBytes/sec
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