An undocumented feature of GVP A1208

[amiga1260]

Last year I bought a GVP 1208 memory card with SCSI controller. I found a special feature. When the SCSI cables is connected to the SCSI controller and CD-ROM 'player and the A1200 isn't turn on. I can't open the CD tray. The CD tray only opens when the A1200 is powered on.

When I connected the same CD-ROM player with a Squirrel SCSI controller and Blizzard 1230 IV SCSI controller, this strange bahaviour doesn't appear.

Does someone had this behaviour with other SCSI cards from GVP?

Or other features with the GVP 1208 memory card?

[weirdami]

Do any of those hardwares have their own power supplies, as opposed to drawing power from the A1200? I'm no experty guy, but if they both have their own power, then the no-opening one probably doesn't power the CD-ROM drive itself and lets your A1200, somehow, do it. Weird.

[Zac67]

Apart from the obvious power issue, this behavior might be caused by the GVP holding the reset signal (pin 40) low, and the constantly resetting drive does not check the eject button.

[eidofoor]

Yup! The Scsi controller on the macrosystem Warpengine Also shows this problem. I agree with Zac that this is mosty likely  a reset bug.

[amiga1260]

The A1200 has her own PSU. The CD-ROM player has been built in an external case with own PSU.