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68k mac networking pre-NuBus #115678 08/10/19 08:54 AM
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Steve Bourg Offline OP
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Being able to bridge NuBus Ethertalk to a tap interface in the host OS is fantastic. Are there any options for a pre-NuBus system? I haven't found any form of a localtalk bridge in mame that would enable localtalk connectivity between emulated macs, or between emulated mac and physical mac. I also haven't seen any emulation for a localtalk to ethernet bridge, or a scsi ethernet nic - something that would be nearly universal for the earlier line of macs. Are any of these approaches in sight for 68k emulation?

Thx

Re: 68k mac networking pre-NuBus [Re: Steve Bourg] #115679 08/10/19 10:19 AM
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rfka01 Offline
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I've posted ROMs and pictures for a Shiva FastPath 4, a NuvoLink SC and a Gatorbox CS a while ago.

Last edited by rfka01; 08/10/19 11:17 AM.

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Re: 68k mac networking pre-NuBus [Re: Steve Bourg] #115680 08/10/19 10:21 AM
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Al Kossow Offline
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Simulating SCSI ethernet devices would be tricky, since the protocol the boxes used wasn't published.

Putting an analyzer on a real device has been on my list of things to do since I think the device is polled.
I've dumped a couple of revs of the code in the Asante boxes. There is some variations between models
with different Ethernet PHI options.

Somewhere, I've dumped the firmware from a couple of revisions of the 68000 based Kinetics local-ethertalk bridges
which evolved from the original bridge box done at Stanford.

Re: 68k mac networking pre-NuBus [Re: Steve Bourg] #115681 08/10/19 10:28 AM
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Al Kossow Offline
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Also, implementing Localtalk with an SCC is very timing sensitive to get the signalling right.
There is a bunch of magic that goes on between the Localtalk and floppy drivers to make sure
interrupts are locked out when I/O to either device is happening.

Re: 68k mac networking pre-NuBus [Re: Steve Bourg] #115682 08/10/19 10:48 AM
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R. Belmont Online Content
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SCC Localtalk is something we want to do, but it's a hard problem.

SCSI Ethernet isn't currently possible because of how we handle SCSI, and we need a cycle-interruptible 68k core to be able to fix that.


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