Falcon Jumper wire CPU <-> U67

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Beetle
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Falcon Jumper wire CPU <-> U67

Postby Beetle » Mon May 21, 2018 3:56 pm

Hi,

i'm working on a Falcon repair, and it has a wire from U67, Pin 19 (marked "E" in schematics) to pin 7 of the CPU (marked "AVEC" in schematics). Pin 19 was bent out of the socket, the empty socket is connected with a second jumper wire to pin 15 (marked "QC" in schematics).

Is this a known hotfix, or a leftover from a former board clock boost? The jumper wire itself is that thin stiff black style the off-factory clockpatches were also done with.

I don't know if to keep or to remove the mod.

greets,
Beetle
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czietz
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Re: Falcon Jumper wire CPU <-> U67

Postby czietz » Mon May 21, 2018 4:33 pm

According to the service manual, it's a hotfix for Rev. 2 PCBs:
https://archive.org/stream/Atari_Falcon ... 9/mode/1up

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paul92706
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Re: Falcon Jumper wire CPU <-> U67

Postby paul92706 » Mon May 21, 2018 4:42 pm

I believe, reading somewhere AVEC is used for older harddrives, i could be wrong, but i am sure i read that somewhere.
Atari Falcon CT60/CTPCI 14MB+ 512mb ATI9250 + NetUSBee
Atari Falcon030 CF 4gb + NetUSBee+ 14MB Ram
Atari TT030 2meg STRAM/16meg TTRAM + Nova Adaptor +Maxtor SCSI HD + DaynaPort Pocket SCSI

czietz
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Re: Falcon Jumper wire CPU <-> U67

Postby czietz » Mon May 21, 2018 4:55 pm

AVEC is the signal for an auto-vector interrupt. The 68030 CPU supports auto-vectored and non-auto-vectored interrupts. Interrupts triggered by the MFP (such as for ACSI HDs) are non-auto-vectored, while some other interrupts are auto-vectored and will not work if AVEC is not generated correctly.

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paul92706
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Re: Falcon Jumper wire CPU <-> U67

Postby paul92706 » Mon May 21, 2018 6:43 pm

czietz wrote:AVEC is the signal for an auto-vector interrupt. The 68030 CPU supports auto-vectored and non-auto-vectored interrupts. Interrupts triggered by the MFP (such as for ACSI HDs) are non-auto-vectored, while some other interrupts are auto-vectored and will not work if AVEC is not generated correctly.


Those this is intended for older ASCI HD's?
Atari Falcon CT60/CTPCI 14MB+ 512mb ATI9250 + NetUSBee
Atari Falcon030 CF 4gb + NetUSBee+ 14MB Ram
Atari TT030 2meg STRAM/16meg TTRAM + Nova Adaptor +Maxtor SCSI HD + DaynaPort Pocket SCSI

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Beetle
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Re: Falcon Jumper wire CPU <-> U67

Postby Beetle » Tue May 22, 2018 6:55 am

Thanks for the rich feedback! I'll keep the hotfix.

cheers,
Beetle
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