Viper 520 CD questions

[Xanxi]

I have too this fine piece of hardware in my PAL A500Plus (and 2 Mo ChipRAM) but unfortunately i don't use it much, it comes after my A1240PPCAteo, my A1240Mediator, my A2030 and my A630.
I only use it with a simple OS3.1 on bootable IDE 2,5'HD and a special zorro adaptater on the side slot to test some zorro boards.

However, i don't think that it would be ok to replace the 3.0 roms with A1200 roms. I take for sure that the Viper ROMS are something special.

As someone said, it is much better to use the jumper to fire up some 3.1 roms on the mobo, or may be to softkick 3.1 roms.

By the way, does some one know of a SCSI controller compatible with this board? My Macropolis side slot SCSI harddrive doen't work, even if i remove the fastram either on the viper or the macropolis.

[Xanxi]

@mr a500:

I definitely want my A630 to look like your wb but i PMed you for some advices some weeks ago with no response.

[Xanxi]

Indeed, the loss of DMA is explained in the german manual of this board.
However, if i plug a A2091 board (with 7.0 roms) in my zorro adapter for the side slot of my A500Plus, the computer still boots normally (from the IDE hardrive) while it doesn't with the Macropolis, and the board is seen in the early startup and sysinfo.
I have not tried to connect some hd or scsi devices on the A2091 yet though. And there is no ram on this particular A2091, maybe this disable dma???
According to the manual A590 and A2091 shouldn't work.