Hi exxos,
I bought one of your RTC cartdriges a few months ago, but life got in the way and only now I was able to test it.
Just wanted to let you know that everything works perfect. Thank you very much!
ST RTC EXTERNAL BETA - WIP
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AndresPlazaR
- Posts: 147
- Joined: 03 Apr 2019 15:35
- Location: Boston, MA, USA
Re: ST RTC EXTERNAL BETA - WIP
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Andres Plaza R.
Bluesky: @aplaza.bsky.social
Twitter: @AndresPlazaR
Andres Plaza R.
Bluesky: @aplaza.bsky.social
Twitter: @AndresPlazaR
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exxos
- Site Admin

- Posts: 28346
- Joined: 16 Aug 2017 23:19
- Location: UK
Re: ST RTC EXTERNAL BETA - WIP
:bravo: :thanksyellow:
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andresv
- Posts: 31
- Joined: 17 Aug 2021 00:32
- Location: Buenos Aires - Argentina
Re: ST RTC EXTERNAL BETA - WIP
Hi all, sorry to slightly change subject here... I'm thinking on building an DS1315 based RTC solution as shown in https://www.exxosforum.co.uk/atari/last/ ... lation.pdf
I have an STE so I guess the best option is #2 (CEI/CEO passthrough) but I'm thinking on connecting a NETUSBEE on the cartridge port so I'm wondering if anyone have tried such combination and how it went. Is this setup compatible?
Thanks in advance,
Andres.
I have an STE so I guess the best option is #2 (CEI/CEO passthrough) but I'm thinking on connecting a NETUSBEE on the cartridge port so I'm wondering if anyone have tried such combination and how it went. Is this setup compatible?
Thanks in advance,
Andres.
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exxos
- Site Admin

- Posts: 28346
- Joined: 16 Aug 2017 23:19
- Location: UK
Re: ST RTC EXTERNAL BETA - WIP
The RTC shouldn't stop other devices from working as its pass through. Though with NETUSBEE being somewhat flakey at the best of times.. Who knows..
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andresv
- Posts: 31
- Joined: 17 Aug 2021 00:32
- Location: Buenos Aires - Argentina
Re: ST RTC EXTERNAL BETA - WIP
I have finally built my own RTC board based on the chip DS1315 and connected (soldered) to the internal cartridge port on my STE.
I have to report that if the NETUSBEE cartridge is not plugged-in then the CEI/CEO passthrough is not needed, but when the cartridge is connected the RTC clock stops working (the NETUSBEE works without issues).
So, in that case, the only option is to use the CEI/CEO passthrough (snipping pin 31 on the cartridge port board connector) and then everything works flawlessly.
Thanks!
Agv
I have to report that if the NETUSBEE cartridge is not plugged-in then the CEI/CEO passthrough is not needed, but when the cartridge is connected the RTC clock stops working (the NETUSBEE works without issues).
So, in that case, the only option is to use the CEI/CEO passthrough (snipping pin 31 on the cartridge port board connector) and then everything works flawlessly.
Thanks!
Agv
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rubber_jonnie
- Site Admin

- Posts: 14888
- Joined: 17 Aug 2017 19:40
- Location: Essex
Re: ST RTC EXTERNAL BETA - WIP
Good to know the original intent to use the CEI/CEO pins in this way works, as I had no means to properly test it, thank you.andresv wrote: 30 Sep 2021 14:23 I have finally built my own RTC board based on the chip DS1315 and connected (soldered) to the internal cartridge port on my STE.
I have to report that if the NETUSBEE cartridge is not plugged-in then the CEI/CEO passthrough is not needed, but when the cartridge is connected the RTC clock stops working (the NETUSBEE works without issues).
So, in that case, the only option is to use the CEI/CEO passthrough (snipping pin 31 on the cartridge port board connector) and then everything works flawlessly.
Thanks!
Agv
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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