DIY Boot Selector - Page 2

Martijn · 18 January 2018, 13:12

Well, I tried yesterday, but no luck. With the switch in normal internal=DF0: position, everything seemed fine, but in swapped state, things went weird:
- Amiga tried to boot from external DF0:
- During disk access to external drive, the internal drive made the same rhythmic sound as well (motor on or head movement, don't know)
- After a few seconds, everything went quiet and the insert disk screen reappeared.

So somehow in swapped mode, the amiga addressed the internal drive. I got a little scared and unsoldered the thing again. Looks like nothing broke and it works as before. I will probably have another look and check my circuit again tomorrow.

Btw: I did verify that my boot selector does actually switch sel 1 and sel 0, instead of only crossing the line for the external drive leaving the signal for the internal drive unconnected.

r.cade · 19 January 2018, 02:01

What you have is correct according to the diagram. Did you test the switch is doing what you think it's doing? (and not shorting pins you don't intend?)

Martijn · 24 January 2018, 11:04

I haven't been able to fix it. I checked my creation again (I made a little four legged spider with the diodes and resistor coming together so as to not have to connect 3 leads to 1 pin on the board directly). For ground I just took a connection somewhere in the neighbourhood that seemed big and had no resistance measured between it and the shield, that should be correct, right?

Anyway, I took your advice of booting with the switch disabled and then flipping the switch, and that works perfectly. So I guess the drive identification is done only during booting?

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18 January 2018, 13:12	#21
Martijn Registered User Join Date: Jan 2018 Location: Utrecht, NL Posts: 15	Well, I tried yesterday, but no luck. With the switch in normal internal=DF0: position, everything seemed fine, but in swapped state, things went weird: - Amiga tried to boot from external DF0: - During disk access to external drive, the internal drive made the same rhythmic sound as well (motor on or head movement, don't know) - After a few seconds, everything went quiet and the insert disk screen reappeared. So somehow in swapped mode, the amiga addressed the internal drive. I got a little scared and unsoldered the thing again. Looks like nothing broke and it works as before. I will probably have another look and check my circuit again tomorrow. Btw: I did verify that my boot selector does actually switch sel 1 and sel 0, instead of only crossing the line for the external drive leaving the signal for the internal drive unconnected.

19 January 2018, 02:01	#22
r.cade Registered User Join Date: Aug 2006 Location: Augusta, Georgia, USA Posts: 548	What you have is correct according to the diagram. Did you test the switch is doing what you think it's doing? (and not shorting pins you don't intend?)

24 January 2018, 11:04	#23
Martijn Registered User Join Date: Jan 2018 Location: Utrecht, NL Posts: 15	I haven't been able to fix it. I checked my creation again (I made a little four legged spider with the diodes and resistor coming together so as to not have to connect 3 leads to 1 pin on the board directly). For ground I just took a connection somewhere in the neighbourhood that seemed big and had no resistance measured between it and the shield, that should be correct, right? Anyway, I took your advice of booting with the switch disabled and then flipping the switch, and that works perfectly. So I guess the drive identification is done only during booting?

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