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Yes of course the linears will throw some heat under load but my thought is to make a switcher 28V to feed them. No current no heat. Switchers with linear regulation are actually pretty good and very small. Mini-box.com sells a ATX device that is similar to what I am thinking of. Of course it...

Yep the 120s are pretty cool I have one but ide and only have one of the disks. I do have a decent CNC mill so as of last night I decided to make a nylon carrier for the SCSI2SD card and move it all the way forward in teh bay and line it up so that I can use teh USB and change sd cards through...

Thanks bigmessofwires you are the man Yes I think that I will probably just solder some wires to the bottom of the external connector through hole nibs and route up to the second drive. I still can not find the bottom of my external floppy case. It is lost in the years of no eject gears. I...

I think I know this guy It may be Robert Aronsson He has a battery company in Pompano florida now. The try polar and lead foam batteries do have larger density at lower weight. They are gearing up to produce them. http://www.apolloenergysystems.com

Thanks  Could you provide links to the discussion ? You are the GURU of the floppy for sure. I have another post here about the LUN issue with scsi on the mac. This also seems implementable. Just seams like there could be a way considering the original HD20 used the DB19 for a HDD with the...

Yep at motorola I used some cherry semiconductor shift registers to produce IO On Autovision 90 controlled RT3200 series robot arms some place I have the notes on the chip numbers. But what I am really wanting to do is feed video out to a BBB and convert to grey scale out use a diy grey scale...

Yep what I am thinking SO if I could find some group of unused address space   in theory I could just read/write some bytes to those addresses to produce io The serial interface is real simple.

Wow thanks cool slides  Instantly added to my library I wrote a bit bang for a parallel port to control some IO on a disc chasing ripper I built  never thought of using the scsi the same way cool.

There was a european company that produced a ADB IO unit called Buzz from beehive technologies I have three of them. Many years ago I built a home automation system that used the 6100 voice recognition and applescript with an OSAX to trigger events. Later I built a ELO touch screen and used...

Also if this chip is a multiplexer like I am thinking it should be able to be implemented by Dougs rom simm with a patch or with an init.

Ok todays quick look at the external drive shows an extra board IF-89 Sony 1-619-250-14 with a chip cxd10858 on the bottom.  I see enb2 for the incoming cable enb1 for the inside drive and enb3 for the db19 out. looks like enb3 passes through from pin 7 to pin three and external and enb2...

Before I start in on this hack has anyone figured out a multi LUN driver for a MechWare scsi card reader ?

Don't worry it's own my new hobby list. With new switching supplies I think it will be a quick turn around to produce a retrofit kit for the Se & se/30 power supply. I'm thinking a pretty straight forward PSU replacement board. Right off hand I ll probably use 7905 and 7912 1a VR for the...

I have a pretty good command of the beagle bone black and use it extensively for projects. I started programing back in the late 1980s using Mac Rail and Nubus cards each with 50 addressable GPIO. I also have three of the Buzzz ADB I/O devices I used back in the 90s for home automation...

Ok so what I am understanding is that there is a signal on internal pin 14 from the drive to the controller. I do believe that the se/30 can use more than one external floppy drive in a daisy chain config. I will give it a try on the external first and sort out how by looking at the external...

I vaguely remember that there is a way to either cut or twist the cable to enable the use of two internal floppies on an se/30 MB. Anyone have the info ? I recently got an SCSI2SD and now have room to put another floppy in the case.