zapbuzz wrote on 2021-11-16, 00:44:
its a generation of card i would trust in a completed working system and i stand by my word EISA and cirrus
Er...
EISA was a vastly more elegant system than VLB, but in terms of performance (precisely due to missing a lot of that elegance) VLB left it in the dust. For a start, EISA was clocked at 8MHz, so with 32b bus width, its theoretical maximum bandwidth was 32MB/s. Latencies were relatively high, as the bus was intentionally separate from (and generally asynchronous to) the CPU's own bus. VLB on the other hand ran at external CPU frequency, so 25-50MHz (let's take 33MHz as fastest it could generally reliably do without wait states) at the same 32b width, so you could get a theoretical 133MB/s out of it. Also because it was actually the CPU bus itself, latencies were much lower than with EISA. So you could get four times the speed out of VLB compared to EISA. Now, whether the VGA chip could use that extra bandwidth is another matter, but given that DOS is pretty bandwidth (and not much else) constrained in performance, given the same VGA chip (say S3 928 or ATi Mach32) the VLB implementation should perform (much) better than the EISA.
Which then begs the next question: Cirrus and EISA? Which card are you talking about? I'm not aware of any Cirrus Logic EISA cards or indeed chipsets...