A2091 SCSI card 7.0 roms

[melott]

No actually on Ebay......

I'm looking for a A2091 SCSI card with ver. 7.0 roms.
Actually its the roms I want.
Does anyone have a set ??
I'll pay a fair price.

[Zac67]

Ralph's put his replacement Guru ROMs in the Public Domain, so better just use those: babel.org

[x56h34]

@Zac67:

Easier said than done. This is useful basically only for people that already own a GuruRom + an Eprom burner, and would like to upgrade to the latest revision.

GuruRom comes with a custom made adapter that unfortunately cannot be bough anywhere separately.

[melott]

@x56h34

Do you by chance have a set of these roms ??  :-D

[x56h34]

@melott:

Hehe, no I don't. I've had a GuruRom for a GVP accelerator+SCSI controller card once, however it was sold together with the card. Or was it that you meant the 7.0 regular roms? I don't have those either, but I'm almost positive that Software Hut should have them in stock.

[Zac67]

Guru ROM just needs 32 KB of EPROM space, so both 27C64 need to be replaced with 27C128s.

Pins 26 need to be connected to A13 from the address latch - make sure there's no connection to anything else. A13 comes in on pin 39 of the Zorro bus. Trace that signal to the bus buffer's input and see where its output runs to.

Would be easier with a schematic or if someone with an adapter could describe it...  :-P

PS: just looked at the A590 schematics: there seems to be no buffering, so A13 should be available on numerous connections. On the A590 it's already correctly connected though.

[melott]

Yup ...
SoftHut has them... just bought a set :-D

[Zac67]

Don't forget to post a description of the adapter!  ;-)