AW: AW: [OpenBIOS] OT: Bios access speeds

Qiwei Xiao qiwei at lucent.com
Fri Apr 30 12:21:53 CEST 1999


Stephan Müller wrote:
> 
> >
> > > You can take a small ISA-prototype-card and a address-decoder (e.g.
> > > 74HC245).
> >
> > Sorry, the 74HC245 is no address decoder, it's an 8 bit parallel buffer
> > driver (usually used for the data bus).
> Hm, what else is used? I can only see this 74245 everywhere... :)
> 


Address decoders are 74LS138 (3 to 8) and 74LS139 (dual 2 to 4). I can 
remember almost all the chips in 74 series. Newer motherboards usually 
don't use them (build the functions in LSI/VLSI/FPGA). 

Qiwei
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