Archived from groups: comp.sys.ibm.pc.hardware.chips (
More info?)
On Thu, 24 Feb 2005 23:41:18 -0500, Yousuf Khan <bbbl67@ezrs.com> wrote:
>George Macdonald wrote:
>> I don't recall seeing a VIA chipset back then for 486. Their earliest
>> chipsets, with their name on them that I recall, were the VP1 and VPX which
>> were for Pentium compatible CPUs. I had a VP2 (aka AMD-640) mbrd with a
>> Cyrix 6x86 which was a Pentium class system. More well known as 486
>> chipsets were OPTi and UMC, IIRC. Before the 6x86, my first major upgrade
>> was swapping out a POS Gigabyte "586" mbrd with i486/33 for a Shuttle mbrd
>> with a "UMC 8881F/8886AF and 8663AF" chipset and a Cyrix 5x86/120.
>
>Back in those days, I can recall the big chipset houses were ALI, SIS,
>and OPTI. UMC might have had a business in it too, but I didn't see too
>many of them. Similarly, I would gather VIA was also around, just not a
>big player yet.
Yeah I think UMC came in more towards the end of the 486 with the 486
enhanced mbrds with PCI; the Shuttle HOT-433, which used the UMC chipset,
actually worked quite well for me though I don't think it did any Bus
Mastering at all. Did Intel ever make a 486 PCI mbrd? ISTR no?? VIA
started in Silicon Valley, before moving to Taiwan, more as a design house
AFAIK - it wouldn't surprise me to learn that VIA designs were used in
particularly the UMC chipset... but possibly some of the others. They used
the same nomenclature as VIA ended up using: 82C5xx etc. etc.
>The really earliest chipset I can think of was from Chips &
>Technologies, they had a chipset business since the 286 days, I can
>recall. Then they just fell by the wayside, after creating the whole
>business.
The C&T was a PITA for many 3rd part cards - we were using Definicon 68020
add-in cards and they wouldn't work in C&T boards - something to do with D
flip-flops being used for latching the upper address lines, IIRC.
--
Rgds, George Macdonald