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.

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rpineau
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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.

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rpineau
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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
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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.

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rpineau
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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 :)

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rpineau
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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).

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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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rpineau
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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.

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