75D First Steps.
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04-22-2021, 09:49 PM
Post: #15
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RE: 75D First Steps.
(04-22-2021 08:53 PM)dhe Wrote: The way the att pod fits, it only shows two rom ports, I was thinking att probably had proprietary software in one of the other slots?While it is not quite that simple unfortunately, it would be possible to replace the system ROMs there is a pin on one of the ROM ports that disables the system ROMs. During development of the 75 the operating system ROMs where on an external EPROM board. I have one of these EPROM boards and it does not appear that they used this signal line, as that signal line is not connected. I also have a prototype card set for a 75 and the system ROMs are not populated on it. Paul. |
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Messages In This Thread |
75D First Steps. - dhe - 04-15-2021, 09:33 PM
RE: 75D First Steps. - dhe - 04-15-2021, 09:35 PM
RE: 75D First Steps. - Dave Frederickson - 04-15-2021, 09:52 PM
RE: 75D First Steps. - dhe - 04-15-2021, 10:57 PM
RE: 75D First Steps. - Dave Frederickson - 04-15-2021, 11:58 PM
RE: 75D First Steps. - Sylvain Cote - 04-16-2021, 02:18 AM
RE: 75D First Steps. - rprosperi - 04-16-2021, 02:29 AM
RE: 75D First Steps. - dhe - 04-16-2021, 12:23 PM
RE: 75D First Steps. - dhe - 04-21-2021, 07:25 PM
RE: 75D First Steps. - rprosperi - 04-21-2021, 09:06 PM
RE: 75D First Steps. - Sylvain Cote - 04-21-2021, 09:42 PM
RE: 75D First Steps. - Paul Berger (Canada) - 04-21-2021, 11:10 PM
RE: 75D First Steps. - rprosperi - 04-22-2021, 12:46 AM
RE: 75D First Steps. - dhe - 04-22-2021, 08:53 PM
RE: 75D First Steps. - Paul Berger (Canada) - 04-22-2021 09:49 PM
RE: 75D First Steps. - Dave Frederickson - 04-22-2021, 11:08 PM
RE: 75D First Steps. - dhe - 04-23-2021, 12:01 AM
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