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 » Thu May 03, 2018 10:40 pm

Based on the ASCI schematic above and the NetUSBee schematic, may be we can combine them to build something like this :
EtherneA.png
EtherneA.png (51.55 KiB) Viewed 201 times

If someone what the Eagle file to double check what I did I'll be more than happy to provide them.
Then we can build a proto and see how it goes.
The ASCI /IRQ doesn't seem to be used so not sure how fast that thing would be without proper interrupt.
Rodolphe

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

Post by tuxie » Fri May 04, 2018 8:49 am

Oh thats great, i think this could be a great solution .. if you want you can send me the schemtic and i will check it. I did the schematic view years ago too but there was no interest. I want one ^^

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

Post by rpineau » Fri May 04, 2018 2:47 pm

Here they are.
Hopefully I haven't made too many mistakes.
The DB19 might be hard to find.

Also the 2nd ASCI port on there is not buffered... so I'll see about adding the required buffer to be on the safe side.

Edit : Added the buffers for the output port. Updated the file.
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tuxie
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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by tuxie » Fri May 04, 2018 6:51 pm

The schematic looks fine but i think you dont need the both 74ABT245.
Pin 96 has to be connected to ground using a resistor

Snipped from the manual:
If it is sensed low, the adapter is thought to be placed on an 8-bit slot where this pin is merely pulled low by the 27KW resistor. After having latched the input state, this pin is switched as the IOCS16B signal which is an open-drain output and is driven low during a 16-bit host data transfer. It is decoded from AEN and SA9-0
Then i would replace all logic IC against a GAL or a tiny CPLD like the Xilinx XC9536_44VQ and connect all signals to the CPLD Addresses and control signals from the st and from the Networkchip... then we can implement also interrupts. I think the driver isnt a problem because a interrupt driven driver does exisit.
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rpineau
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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by rpineau » Fri May 04, 2018 7:23 pm

the 245 are there to buffer the ASCI bus to the next device (taken from some atari doc), but I can remove them.
I'l fix pin 96, thanks for checking :)
I'm not against putting everything in a XC9536_44VQ :) (the XC9536XL-5VQG44C is less than $3 on Digikey).
I can make a second version with this (and add the required 3.3v LDO, but that easy to do).

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

Post by rpineau » Sat May 05, 2018 12:53 am

Buffers removed. Pin 96 grounded via 1K, reduce board size. Routed TPIN and TPOUT differential pair.
So may be we should test this before replacing the logic with a XC9536XL ? :)
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tuxie
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Re: NetUSBee Lite problems on TT: Any thoughts?

Post by tuxie » Sat May 05, 2018 11:05 am

Yes would I suggest too.i would order some pieces over dirtypcb but I think shipping to USA would be to expensive ?

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

Post by rpineau » Sat May 05, 2018 4:42 pm

I use either OshPark here in USA. These would be about $65 for 3 boards and shipping is not bad. I also use PCBWay and shipping is about $21 to USA for a 5 or 10 boards pack. it would be $71 for 10 board (I changed the drill to 0.3mm to be in the cheap board tier).

Rodolphe

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

Post by rpineau » Sat May 05, 2018 6:53 pm

I was looking for sources for the RTL8019AS, not easy to find beside eBay and other Chinese sources. I also read horror stories about "fake" RTL8019AS .. so we might run into some issues if we can't find a proper source.
Another option is the Microchip LAN91C96, has a 8 bit mode and works in pretty much the same way as the RTL8019AS.
I wonder where Lotharek gets the RTL8019AS.
Rodolphe


Edit : looks like Future Electronic and Symmetry electronic have big quality in stock... so I guess we don't need to worry too much :)

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

Post by czietz » Sat May 05, 2018 7:07 pm

Here in Germany I found quickly found the RTL8019AS to be available in at least two reputable online shops. I guess it's similar for Lotharek -- who is in Poland, afaik. However, given that it's a discontinued product, one will get sourcing issues sooner or later. If the LAN91C96 is software compatible and still in production, I'd go with that.

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