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68k mac networking pre-NuBus
#115678
08/10/19 08:54 AM
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Joined: Aug 2019
Posts: 33
Steve Bourg
OP
Member
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OP
Member
Joined: Aug 2019
Posts: 33 |
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
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Re: 68k mac networking pre-NuBus
[Re: Steve Bourg]
#115679
08/10/19 10:19 AM
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Joined: Jan 2012
Posts: 1,028
rfka01
Very Senior Member
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Very Senior Member
Joined: Jan 2012
Posts: 1,028 |
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.
NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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Re: 68k mac networking pre-NuBus
[Re: Steve Bourg]
#115680
08/10/19 10:21 AM
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Joined: Jan 2011
Posts: 195
Al Kossow
Senior Member
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Senior Member
Joined: Jan 2011
Posts: 195 |
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.
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Re: 68k mac networking pre-NuBus
[Re: Steve Bourg]
#115681
08/10/19 10:28 AM
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Joined: Jan 2011
Posts: 195
Al Kossow
Senior Member
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Senior Member
Joined: Jan 2011
Posts: 195 |
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.
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Re: 68k mac networking pre-NuBus
[Re: Steve Bourg]
#115682
08/10/19 10:48 AM
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Joined: Mar 2001
Posts: 16,393
R. Belmont
Very Senior Member
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Very Senior Member
Joined: Mar 2001
Posts: 16,393 |
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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