🚀 go-pugleaf

In article <4991431wnr@tangon.demon.co.uk>
           woody@tangon.demon.co.uk "woody" writes:

> In article: <h8ySUBAa2ThxEwCG@johnpb.demon.co.uk>  John Bennett 
> <john@johnpb.demon.co.uk> writes:
> > 
> > I attempted to install a cover disk (SU27 Flanker) on my son's 486DX-66.
> > 
> > The install was aborted by a message that the program could not locate a
> > "VESA" driver.
> > 
> > I am not sure what this means.     Could someone explain to me what a
> > VESA driver is and where I can get one from?
> >
> 
> VESA (a.k.a. VESA local bus or VLB) is a high speed connection between the 
> processor and the interface cards, here most probably the video.  The normal 
> ISA or enhanced ISA (EISA) expansion sockets into which the video and
>  hard/floppy 
> disc/serial/parallel port cards are plugged (large black straight sockets on
>  the 
> motherboard, usually six to eight in number) are limited to 8MHz (8m ticks per 
> second) and thus limit data throughput.  For faster communications an
>  additional 
> socket of much narrower and closer pins was added to the tail end of up to
>  three of 
> the ISA connectors, and the data on these ran/runs at up to processor speed -
>  in 
> your case 33MHz as the processor clock doubles internally, hence the 2-66.  The > VLB sockets, due to loading, were limited to 3 but in most cases there were 
> problems if more than two were used at once.  Your CDR is telling you it needs
>  a 
> VLB card, probably video, to be able to get the throughput (and thus video 
> speed/number of colours) and you don't have one.  Buy one now (a Cirrus 5429 or > compatible is a good bet) as VLB has been superceded by PCI which does away 
> with both VLB abd ISA sockets in favour of a new and smaller connector, so 
> supplies are getting short as they are now only made in small quatities if at
>  all.
> 

-- 

 Michael S. Cowgill (Mike)        \_ "  ...Not even Wensleydale?...  "
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