3 ms·
16 bit ISA@8.33MHz was about 15x slower than PCI. A 10BASE2 card used a significant fraction of the bus.
by aidenn0 3y ago
16 bit ISA@8.33MHz was about 15x slower than PCI. A 10BASE2 card used a significant fraction of the bus.
- rasz 3y agoTo expand on the above, absolute theoretical 16bit ISA limit is 2 cycles per transaction (0WS), (2 Bytes x clock MHz)/2 cycles = ~8MB/s at 8MHz. In practice best period correct VGA cards reach ~4-6MB/s write speed. Slowest VLB cards do ~10MB/s fastest ~30MB/s, slowest PCI VGA ~15MB/s fastest again ~30MB/s.