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Ethernet for PCjr {WizNet}

PostPosted: Wed Jan 11, 2017 9:20 pm
by Shaos
Is anybody interested in this kind of thing?

I believe I can add WizNet module to custom cartridge and write packet driver for it...

P.S. + SD-card reader (and writer : )

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Wed Jan 11, 2017 10:32 pm
by MikeModified
How about VGA output vis-à-vis the TRS80 M1 MISE http://bartlettlabs.com/MISE/index.html (which uses a WIZ830MJ)?

Mike

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Wed Jan 11, 2017 10:46 pm
by Shaos
MikeModified wrote:How about VGA output vis-à-vis the TRS80 M1 MISE http://bartlettlabs.com/MISE/index.html (which uses a WIZ830MJ)?

Mike

I think it's too much (especially for the price $330 - you can buy brand new computer for that : )

I want to keep price below $100 (preferably around $50, but not for the 1st batch)

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Thu Jan 12, 2017 6:09 am
by alanh
I say take advantage of the free time while you have it. My PCJr NetPI project is stalled atm because I'm working 3 contract jobs at least until April. I did get over the main technical barrier I faced over Christmas - it is now possible to reprogram the CPLD from the Pi. So if I can scratch out just a bit more time, it can get it in the hands of others to help.

You probably are already aware, but the cartridge slot does not have a write strobe. So the only method of writing data is recognizing progressive read patterns similar to how the ROM module RTCs used to work.

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Thu Jan 12, 2017 9:08 am
by Shaos
Yes, I plan to use trick of reading from let say 0x7Fxx range and hardware will treat it as a write of the byte xx to some earlier specified address (by read from other range for example)

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Sun Jan 15, 2017 12:20 pm
by Brutman
I think that anything in a cartridge slot, except a ROM, is probably more pain than it is worth.

For Ethernet I'd love to see something in the modem slot. It has an interrupt line. It has I/O ports. Putting wired Ethernet in there should be easy. Wired Ethernet isn't as cool as the jrIDE based emulated hard drive/wifi/Linux co-processor that Alan isn't work on, but it also doesn't require a jrIDE and it's really simple in comparison.

I've gone through a few times over the years and looked at Ethernet chipsets that I could work with in the modem slot. But I'm a software person and I barely have a working knowledge of TTL logic, so I've never progressed to breadboarding a solution. It's probably a reasonable beginner project though.

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Sun Jan 15, 2017 5:52 pm
by Trixter
Brutman wrote:For Ethernet I'd love to see something in the modem slot. It has an interrupt line. It has I/O ports. Putting wired Ethernet in there should be easy.


Additionally, no case modifications would be necessary, since the window is wide enough for an RJ11 and will probably take an RJ45 just fine.

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Sun Jan 15, 2017 7:48 pm
by Shaos
ok, I'll think about it...

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Tue Jan 24, 2017 9:08 am
by geoffdaddy
Plus, you wouldn't have an ethernet cable coming out the front of the unit.

Re: Jr Cartridge Ethernet {IDEA}

PostPosted: Tue Jan 24, 2017 8:51 pm
by KenG
I would certainly prefer either an internal card or sidecar. I think performance would be better also.