11 March 2012, 13:45 | #1 |
Posts: n/a
|
RTC on the a1200 MB ?
What would be needed to put an RTC like RF5C01A on the a1200 motherboard ? I guess an oscillator and some additional components. And would it work at all ?
I have a spare MB that I just woke up from a mem failure by soldering in some new chip ram circuits and it seems to work fine. But got curious on the space for the RTC next to the ram's and if it is not to much tinkering.....why not..try |
11 March 2012, 16:55 | #2 |
-
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,861
|
Check out the A1200 schematics. They have the optional clock circuit drawn into them.
|
23 July 2017, 12:14 | #3 |
Registered User
Join Date: Jan 2017
Location: Australia
Posts: 84
|
I realize this is an old thread, but I am not able to find the answer... did anyone actually add the parts onto the A1200 motherboard for the RTC (as per the schematic) and get it working? It's only a couple of dollars in parts and 30 minutes with a soldering iron. I have tons of spare parts here to do it, all I would need to buy is the RTC chip. SMD is no problem for me so I can do the work, but I'm curious if anyone has done it and if it worked?
|
23 July 2017, 14:56 | #4 |
Digital Corruption
Join Date: Jan 2007
Location: Dorrigo/Australia
Age: 60
Posts: 355
|
Hi Fordav1,
Yes, it does work. Did it to a 1D4 A1200 many years ago, though I no longer have it. I acquired it with an early GVP A1230 Turbo+ card installed, which doesn't have an RTC. Putting the components on the motherboard seemed liked the best option at the time to leave the "clock" port free for a silver surfer board. Cheers, Red |
23 July 2017, 15:15 | #5 |
Registered User
Join Date: Jan 2017
Location: Australia
Posts: 84
|
excellent, thanks for the info. I'll give it a try.
|
24 July 2017, 02:48 | #6 |
Banned
Join Date: Jul 2017
Location: Ha Noi
Posts: 1
|
thanks. I will try it right after reading this article
|
05 August 2017, 16:55 | #7 |
Registered User
Join Date: Jan 2017
Location: Australia
Posts: 84
|
Just a quick update: I've added the parts (minus RTC) and the battery charges as normal. Still waiting for the RF5C01A chips to arrive. I had a hell of a time sourcing them, they are seriously not easy to find now in the SOIC18 package. I ended up going with some random seller on aliexpress who didn't speak English very well.
|
28 October 2021, 14:32 | #8 | |
Registered User
Join Date: Oct 2021
Location: USA
Posts: 1
|
Quote:
|
|
29 April 2023, 22:33 | #9 |
Treadwheel
Join Date: Jul 2020
Location: Reading, Mass USA
Posts: 5
|
Hi,
I'm reviving this old topic too because somehow my RTC circuit has stopped working and I'm wondering if just adding this chip will it restore my RTC ability. Whatever I do the RTC is not found anymore. I just added a battery to my 1260 and it kept time for 2 weeks then just stopped because it cannot find any clock anymore. Would this chip restore my clock or is something else preventing it from working? The +5v is present on the clockport. Clockport module does not work either although these work on my other Amiga 1200. Thanks. |
10 May 2023, 09:53 | #10 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 710
|
I was going to say that I don't think it's possible since according to the RF5C01A datasheet it is an 18pin part, whereas the A1200 footprint is 20pin and the pins will be messed up. My assumption was that Commodore messed up the circuit/schematics and never bothered to fix it but people claim to have done the mod successfully so maybe Ricoh made it in 20pin too?
|
10 May 2023, 10:48 | #11 |
Registered User
Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 6,334
|
Regarding the Blizzard 1260's RTC, are you using the correct battery? Some Blizzards were fitted with VL2032s, others with CR2032s, and they're not compatible. Fitting the incorrect type will produce symptoms you describe: the clock working for just a short time. Another issue I've had on one B1260 that was fitted with a CR2032 was the failure of a protection diode on the board, which gave similar symptoms.
Motherboard clockport modules will be hit and miss when the accelerator has its own RTC built in. Some will ignore it, some will defer to it, some will produce garbage due to contention when both RTCs are read at the same time. |
29 August 2023, 17:44 | #12 |
Registered User
Join Date: Aug 2023
Location: Raleigh/USA
Posts: 9
|
I have an ACA1234 with an rtc module and I was thinking to put one rtc on the motherboard.
Do you know if the ACA ignores the rtc from the motherboard when the ACA is active? Also the otherway around. If for some reason I have disabled the ACA and I use the x20 and the workbench from the motherboard IDE does the workbench reads the clock from correctly |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
A3000 RTC issues | brett71 | support.Hardware | 13 | 27 June 2021 17:45 |
For Sale: Gasteiner M1202 RAM/RTC A1200 expansion | Voz79 | MarketPlace | 9 | 05 December 2009 12:55 |
Slamtilt and RTC collision | Predseda | support.Games | 5 | 22 August 2009 22:28 |
FS: Hawk Memory FPU RTC A1200 Expansion Card | tonyyeb | MarketPlace | 9 | 28 October 2008 09:25 |
RTC problem | anathema | support.WinUAE | 0 | 15 July 2003 11:22 |
|
|