SOLD!

[keropi]

amigadave wrote:
@JKD,

Do you know if all Vortex 486slc Bridgeboards at 25mHz can be "internally clock doubled" to 50mHz?  Or does it take a new crystal to accomplish?  And do you think most, or all of them can handle such doubling and retain reliability in operation?

look here

How to upgrade your GoldenGate486slc/25mhz to 486slc2/50mhz!

[keropi]

hmmmm
fastest ISA card... the fastest I have are two CL-5428 cards, one with 1MB and the other with 2MB VRAM...
but on my gg486/50 I use a CL-5420/1MB one... there is no speed gain because the ISA bus of the A4000/gg is maxed out with the 5420... I did some benchmarks and saw no improvement at all!

[keropi]

yes, the GG also has some isa speed options... maybe this is the case, any 54xx card just maxes out the bus...
when I used a 5420 or 5428 for the matter, a SB16 non-pnp AND a DB60XG wavetable midi add-on, in some games midi slowed down when lots of stuff happened... that is how I concluded the ISA bus chockes and use a plain 8bit SoundBlaster 2.0 ...
that slowdown does not occur on a real 386sx/20 ISA pc (whereas the gg was slc2/50mhz upgraded), with the same cards, with the same game. apparently the gg isa bus has less bandwidth...

[keropi]

the 2MB CL-5428 I have is a SPEA V7-Mirage one... had a V7 sticker on the 5428, but it is long gone LOL

[keropi]

@amigadave:

just contact the ebay seller I mention in the thread...

as a sidenote, the fastest ISA card I have found and bought is an STB CL-5429/1MB one... I just remembered it  :-)