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I know I can purchase the a2heaven ram expansion for $70 when instock. However, looking at the schematics of the IIc's expansion port and reading the disassembly of the ROM code that deals with it, it seems that this is just RAM connected to slot #4 with ROM code to let you treat it like a...

Nope, serial issue not resolved. Only 7 bits in or out.

Nope. This is a ROM3 originally, but I have a ROM4 in it. I have to try the serial ports with the power issue addressed and see if there's a change.

My own question answered... I think all of this was caused by an underpowered external PSU. I switched to a 4 amp 20 volt external and all seems well.

Another question... Reviewing the schematics that AppleFritter has for the IIc, I'm noticing that sheet 5 shows that the connectors from the external PSU that I keep reading are not connected to anything, actually are... They run to the 1488 and 1489 serial lines. Am I crazy to think that this...

Yes, Verault. That's documented above in the post from 3:36.

And things have gotten worse.. It will now sometimes do it with only the internal floppy installed. It does seem like it's the internal switching PSU that's cutting out because of the fault, whatever it is. I'm thinking about wiring a bench supply in to the system to see if I can follow the...

Oh, interesting... With *anything* connected to the smartport, it can happen. It just happened with only a floppyemu connected, and that draws very little. To sum up: * It only happens with an internal 5.25 connected * Any 5.25 drive internally will cause it * With the internal drive...

No problem when the internal disk is disconnected. Yes, this only happens with the external unidisk connected.. but without the internal drive, I can connect the unidisk and another 5.25 behind it with no problem. I haven't tried measuring voltages when it does this, but that's a super idea...

Well, I dismantled the external 5.25 unidisk. It took some doing, but I wired it in... The system behaves *identically*. As soon as the internal drive tries to spin, "powerdown" like overcurrent protection. I'm remembering back now that I actually tried a different internal PSU in this iic a...

Yes, the voltages all look fine. The system operates completely fine most of the time. It's only sometimes that it acts in this way. I do have an external 5.25.. I've never had it apart and it's just stored. I'll open it up and see if that drive can fit in the chassis and if the behavior is...

Mm.. Pulled them all, tested (all good, one marginal) and replaced. Still has the same issue, regardless of external PSU. Any other thoughts?

Ok, I'll give that a shot. Thanks Timo. I've already swapped the external supply.

I have a IIc... Works fine without the unidisk connected. Normally works fine with the unidisk connected. However, sometimes, when I power on, it will beep and begin to spin the drive and then "power off."... It looks like over-current protection, but I need some guidance about where I should...

I did look at that... it's expensive to build...

Not that I know of. to be clear, I'm not asking the Pi/Arduino to provide access to an SD card or something to simulate a disk image... I'm creating the hardware interface there to a real 3.5" floppy drive so that I can use all of these 3.5" floppies, which I greatly prefer over my aging 5 1/4.

Can someone give me a sanity check? I've desired a 1581 for years. I very nearly bought one yesterday, but when the last 10 second price skyrocketed to > $450, it was way more than I'm willing to spend... I'd spend up to $200 or so. Anyway, I have entertained thoughts of just creating a 1581...

I have a C128-DCR here plus an external 1571 (and an external 2031LP over IEEE, but that's another story)... I purchased the JiffyDos images for everything and have a problem. The install into the 1571 and 1571DCR is trivial. The problem is how and where to burn the images for the 128. It...

This had started as a result of someone saying that they were looking for an O2, but that person has since gone silent and hasn't responded to my PMs... so.... ---- I've pulled the O2 out of my office closet; there was a stack of stuff waiting to get sold on eBay in front of it! This is a...

Ahhhhh... prior to reading this, I kept reading about this deflection... I can't really see it, but I've found that if I sort of nudge/support the head arm that rests on the head lifter when the drive is open, it tracks across tracks and formats the disk! So... How exactly does this thing need...