A2000 A2386SX BridgeBoard & ATX-PSU Adapter

amigoun · 18 March 2013, 23:51

Some time ago I bought Amigakit's Amiga 2000 ATX PSU Power Adapter Cable which work fine, but later I realized that using the ATX-PSU Adapter Cable prevents booting of the A2386 BridgeBoard, which apparently relies on the TICK signal from PSU (which is missing on ATX) and the motherboard-generated TICK (jumper J300) seems to be non working for BB.
Any help ? (apart from using the original PSU , of course

)

Loedown · 19 March 2013, 05:37

J300 lets you select the source of the TICK signal, looking at the schematics this can either come from the PSU or from _VSYNC. I am not sure what it does specifically but I could assume it's used as a watchdog type signal, if no signal present then do ( this ) and if signal present do ( that )

Perhaps the BB is using it as a sync back to the Amiga to ensure it all stays in time for clock signals?

adolescent · 19 March 2013, 05:49

Missing -5V on your new ATX PSU? Just a guess as I do not have a bridgeboard.

pandy71 · 19 March 2013, 11:58

TICK from PSU is probably power zero detector i.e. 50/60/100/120Hz.

source · 19 March 2013, 23:04

Mine boots with an atx psu using the jumper to set the tick signal to get from the motherboard instead of from the PSU.

amigoun · 19 March 2013, 23:24

Quote:

Originally Posted by source

Mine boots with an atx psu using the jumper to set the tick signal to get from the motherboard instead of from the PSU.

Really? Than you are lucky. Mine BB hangs after Memtest screen. Maybe theres another factor in my Amiga which prevents Tick signal from VSync to work with it.

Loedown · 20 March 2013, 00:06

Quote:

Originally Posted by amigoun

Really? Than you are lucky. Mine BB hangs after Memtest screen. Maybe theres another factor in my Amiga which prevents Tick signal from VSync to work with it.

If you have an oscilloscope you could check for the tick signal, I have even seen jumpers that go open circuit on the inside and that may be a problem, you could have a wire broken somewhere, especially if the A2000 had a problem with battery leakage in the past.

source · 20 March 2013, 01:11

Do you have an accelerator in you amiga? What other expansion cards do you have installed? What version is the Mobo?

amigoun · 20 March 2013, 12:28

Unfortunatelly I can not measure, do not have any Oscilloscope..
Theres Derringer 030 accel, GVP SCSIController, Indivision ECS installed. Mobo rev. 6.2.

amigoun · 08 April 2013, 23:16

Problem dissapeared after changing the ATX PSU and the Bridgeboard starts just fine so I am happy that I am not forced to use original and noisy PSU!

18 March 2013, 23:51	#1
amigoun Registered User Join Date: May 2010 Location: Czech Rep Posts: 599	A2000 A2386SX BridgeBoard & ATX-PSU Adapter Some time ago I bought Amigakit's Amiga 2000 ATX PSU Power Adapter Cable which work fine, but later I realized that using the ATX-PSU Adapter Cable prevents booting of the A2386 BridgeBoard, which apparently relies on the TICK signal from PSU (which is missing on ATX) and the motherboard-generated TICK (jumper J300) seems to be non working for BB. Any help ? (apart from using the original PSU , of course )

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19 March 2013, 05:37	#2
Loedown Precious & fragile things Join Date: Feb 2009 Location: Victoria, Australia Posts: 1,946	J300 lets you select the source of the TICK signal, looking at the schematics this can either come from the PSU or from _VSYNC. I am not sure what it does specifically but I could assume it's used as a watchdog type signal, if no signal present then do ( this ) and if signal present do ( that ) Perhaps the BB is using it as a sync back to the Amiga to ensure it all stays in time for clock signals?

19 March 2013, 05:49	#3
adolescent Powered by Motorola Join Date: Feb 2002 Location: Redondo Beach, CA Age: 52 Posts: 1,065	Missing -5V on your new ATX PSU? Just a guess as I do not have a bridgeboard.

19 March 2013, 11:58	#4
pandy71 Registered User Join Date: Jun 2010 Location: PL? Posts: 2,824	TICK from PSU is probably power zero detector i.e. 50/60/100/120Hz.

19 March 2013, 23:04	#5
source Zone Friend Join Date: Jul 2005 Location: Toronto, Canada Posts: 734	Mine boots with an atx psu using the jumper to set the tick signal to get from the motherboard instead of from the PSU.

20 March 2013, 01:11	#8
source Zone Friend Join Date: Jul 2005 Location: Toronto, Canada Posts: 734	Do you have an accelerator in you amiga? What other expansion cards do you have installed? What version is the Mobo?

20 March 2013, 12:28	#9
amigoun Registered User Join Date: May 2010 Location: Czech Rep Posts: 599	Unfortunatelly I can not measure, do not have any Oscilloscope.. Theres Derringer 030 accel, GVP SCSIController, Indivision ECS installed. Mobo rev. 6.2.

08 April 2013, 23:16	#10
amigoun Registered User Join Date: May 2010 Location: Czech Rep Posts: 599	Problem dissapeared after changing the ATX PSU and the Bridgeboard starts just fine so I am happy that I am not forced to use original and noisy PSU!

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