NetUSBee Lite problems on TT: Any thoughts?

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rpineau
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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Sat May 05, 2018 8:35 pm

Good point. I also found the CS8900A is still available from Digikey and Mouser and is an ISA ethernet controller similar to the RTL8019AS

Edit : The key is to find a NE2000 compatible chip or the software will need to be rewritten.. The CS8900A datasheet doesn't explicitly say anything about NE2000 compatibility. Same thing for the 91C96.
This doesn't mean we can't build a new adapter with one of these but someone need to write the STinG driver and mintnet driver.
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Sat May 05, 2018 9:47 pm

I was reading the "ARCHITEC.TXT" from the original etherne.zip file. So there is no interrupt.. but it says that it would be possible to use the parallel port interrupt for this. I might add a IRQ pin on the board for testing.

Same for a proper DMA mode, the doc says this should be possible for mintnet (and also Sting but would be more work) and send/read a full ethernet packet via DMA.
There are no DRQ and DACK pin on the RTL8019AS so not too sure how we could use the DMA mode. The RTL8019AS has "remote DMA" registers and can do DMA transfer over the 8bit interface.
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Sat May 05, 2018 10:50 pm

Updated version of the board. Added a few things including a pin to wire to the parallel port interrupt (wire ton IRQ0 on the RTL8019AS and inverted using the remaining nor gate). Fixed some resistor and caps values. Should route without any issue in 8mil.
This version us fully routed in 8mil with 0.3mm drill so should be fairly cheap to make.
If someone could re-re-re-check the schematics :)
I can then order some PCB .


Rodolphe
Attachments
EtherneA.zip
(108.8 KiB) Downloaded 24 times
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

stephen_usher
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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by stephen_usher » Mon May 07, 2018 3:00 pm

Wow! What have I done?!

Reading back through the posts, we certainly have some talented hardware engineers here. I had been wondering privately about how viable using a Raspberry Pi + interface board (via GPIO) connected to the parallel port would be, as a rather over powered intelligent ethernet interface and using the strobe/busy lines for data flow direction control and interrupt.

It would, of course, require a driver at the Atari end and code on the Pi.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Mon May 07, 2018 9:46 pm

That's what happens when you give us idea :)
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Fri May 11, 2018 7:44 pm

No sure if anybody had time to review this and confirm that I haven't made any glaring mistakes.
If I don't hear anything after the weekend I might order a set of 5 PCB to be distributed to interested users (just the PCB, you'll need to solder the component on them).
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

frost
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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by frost » Sun Jun 03, 2018 8:37 am

Hi Rodolphe,

I didn't check your PCB, but I was having a little round on this yesterday and found your recent tests on this. Any news on your side ?

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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Sun Jun 03, 2018 5:42 pm

Hi.
No I haven't had time to do anything recently. I haven't ordered the PCB yet as I still need to re-re-re-check everything.
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Wed Jul 18, 2018 8:51 pm

Here are the eagle files and gerber files if someone want to order some board. I could order some but I'm in USA and most of the people here are in Europe so I would have to send them to Europe after. I will oder a small set of 5 for me so if you're in USA and want the PCB (not assembled.. don't have time :) ) let me know.
As explained in this thread... we hope it'll work there is not guaranty. I also added a jumper to allow to connect the INT0 pin of the RTL to the /IRQ pin of the DMA (via an inverter) in case we can modify the current drivers to use interrupt (should speed up things).

Rodolphe
Attachments
EtherneA.zip
(218.08 KiB) Downloaded 15 times
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2

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