I just bought a new 2.0 Gig Maxtor drive that supports PIO 3 & 4 and also DMA
I have a Promise 4030VL-2 Cache controller (without the LBA update.)
I installed as such:
100 Meg C: drive FAT
400 Meg D: drive FAT on 400 Meg second drive (Western Digital.)
400 Meg E: drive HPFS for OS/2
1500 Megg F: HPFS for storage etc.
(Since I boot from the E: partition, I don't need LBA.)
However, here is the clincher. I have 4 Meg of hardware cache on the Promise.
It was giving me really low throughput in DOS and OS/2.
I replaced it with a DTC 2278 EIDE and put the correct DOS and OS/2 drivers
Now I get 10X the throughput on the Maxtor and 4X on the Western Digital.
(But I do miss the 4 Meg hardware cache.... it adds a little bit of zest...
most everything loads faster with the non-cached controller running the drives
higher PIO rates.
QUESTION: I am considering getting an EIDE controller that supports DMA 1&2
drives support this. What experiences have people had with busmastering (DMA
At this time I'll just snag a VESA controller card for about $80.00 but
ultimately I will dump the motherboard I have and get a dual-pentium PCI
(LATER. When I save some bucks...) But in the meantime I'll get the
DMA capable VESA board.
Has anyone done something similar? I understand the CPU utilization goes down
when doing I/O. (Which is a lot since I only have 20 Meg on the motherboard.)
This should add a bit of zing to OS/2. (Although not DOS probably...)
Please SOMEBODY WITH EXPERIENCE RESPOND......
(Is there any DMA capable BUSMASTERING EIDE CACHE boards out there? Or is the
incapable of doing DMA because the cache is between the MB and the drive?)