RTC Replacement

Current solutions and designs.
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avctech
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Joined: Thu Aug 20, 2020 3:23 pm

Re: RTC Replacement

Post by avctech »

I managed to check all the connections this morning and found that pin 15 (RXW) isn't connecting. It looks like when I removed the existing chip I must have damaged that track :oops:

The track for that pin isn't visible so does anyone have any suggestions on how I can repair it?

Cheers
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atari030
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Re: RTC Replacement

Post by atari030 »

I had trouble with mine and had to nut it out so I listed everything to buzz it out. The trace should run to U24+U52/Pin13 (ACIA). That ground plane is a bitch.

U64/Pin1 Power 5V
U64/Pin2 not connected or not used
U64/Pin3 not connected or not used
U64/Pin4 AD0 <-> U31/Pin41
U64/Pin5 AD1 <-> U31/Pin42
U64/Pin6 AD2 <-> U31/Pin43
U64/Pin7 AD3 <-> U31/Pin44
U64/Pin8 AD4 <-> U31/Pin45
U64/Pin9 AD5 <-> U31/Pin46
U64/Pin10 AD6 <-> U31/Pin47
U64/Pin11 AD7 <-> U31/Pin48
U64/Pin12 GND
U64/Pin13 RTCCS <-> U56/Pin75
U64/Pin14 RTCAS <-> U56/Pin76
U64/Pin15 RXW <-> U24+U52/Pin13
U64/Pin16 not connected or not used
U64/Pin17 RTCDS <-> U56/Pin55
U64/Pin18 is connect to C232, R243 and D11 on the motherboard backside
U64/Pin19 not connected or not used
U64/Pin20 not connected or not used
U64/Pin21 not connected or not used
U64/Pin22 not connected or not used
U64/Pin23 not connected or not used
U64/Pin24 Power 5V
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avctech
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Re: RTC Replacement

Post by avctech »

Thanks Atari030, all sorted now :)
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avctech
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Re: RTC Replacement

Post by avctech »

Thanks to everyone who helped me sort this out, your support and patience is greatly appreciated :thanksyellow:
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exxos
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Re: RTC Replacement

Post by exxos »

:bravo: :goodpost:

What was it in the end ?
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avctech
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Re: RTC Replacement

Post by avctech »

I screwed the track on Pin 15 😡 Anyway, some enamelled wire and 5 minutes, all fixed 👍
4AF0796E-30BC-477F-B648-EB47344C7946.jpeg
4AF0796E-30BC-477F-B648-EB47344C7946.jpeg (251.5 KiB) Viewed 4509 times
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atari030
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Re: RTC Replacement

Post by atari030 »

This week I'm doing tech support for a CSIRO cluster. I got much more satisfaction in seeing that Falcon working again. :-) Nice one.
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avctech
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Re: RTC Replacement

Post by avctech »

Switched Falcon on today, and it doesn’t boot ☹️

This is all I get...anyone got any ideas?
143F90E0-6F3B-48C7-97CD-50B80EBD4CA3.jpeg
143F90E0-6F3B-48C7-97CD-50B80EBD4CA3.jpeg (433.34 KiB) Viewed 4473 times
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exxos
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Re: RTC Replacement

Post by exxos »

Never seen that one before :shrug: like its in some test mode or something. Is the floppy light still flashing ?
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Cosmic Puppet
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Re: RTC Replacement

Post by Cosmic Puppet »

avctech wrote: Wed Aug 26, 2020 8:27 pm I screwed the track on Pin 15 😡 Anyway, some enamelled wire and 5 minutes, all fixed 👍

4AF0796E-30BC-477F-B648-EB47344C7946.jpeg
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