Re: [TUHS] Fwd: Choice of Unix for 11/03 and 11/23+ Systems

[Paul Riley <paul@rileyriot.com>]

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Sorry, That should be 8kB (4kW) of high memory...


On Mon, 28 Sep 2020 at 08:03, Paul Riley <paul@rileyriot.com> wrote:

>
>> don't know how that board uses the SD card, in terms of where it keeps the
>> RL02 image, but if you can find that out, SD<->USB3 adaptors are cheap and
>> plentiful, and it shouldn't be too hard to load the disk image into it
>> using
>> one of them. (For the QSIC, I found a 'dd' for Winsdoze and used that to
>> write
>> the disk image onto the SD card.)
>>
>> Here's how the formatting of the SD card is done. First you partition the
> disk into n 'FAT 12" partitions, one for each drive you wish to connect.
> Then you pop the card in the emulator board, and run a utility which
> formats the partitions as "Linux" and you then have n 10.5MB Linux
> partitions. Putting the card back into your host machine, you then copy
> your RL02 disk images to the newly formatted Linux partitions.
>
> Here's the full explanation:
>
> https://www.5volts.ch/pages/rlv12/rlv12-createdisk/
>
>
>>     > I don't have any PROMs other than what would be on the '03 or '23+
>>     > boards now.
>>
>> Not a problem: if you hook up the -11's console to another computer, you
>> can download a bootstrap into it over the serial line, using the -11's
>> ODT.
>>
>
> Thanks for the tip.
>
>
>> Speaking of booting, I have Mini-Uix booting under an -11/05 simulator
>> (Ersatz-11); I used the RK image from here:
>>
>> Thanks again.
>
>
>> Oh, I recently realized how to make a  bit more room on an -11/03: most
>> DEC small QBUS memory cards allow you to use half the 'I/O page' for
>> memory,
>>
>
> Sounds beyond me, and not necessary at this stage.
>
>
>> What kind of memory card(s) do you have for the -11/03?
>>
>>
> The 256kB card is:
> M8067-KA MSV11-PK 256-kbyte MOS memory with parity CSR
>  I'll keep that for the '23+.
>
> Can you clarify something for me regarding memory? I understand the bottom
> area of memory in a Unix system is for the Kernel and it's stuff, and that
> the top 8kB is set aside for device I/O (with the exceptions you mentioned
> in a previous email about using some of that space). The LSI-11 board has
> 4kW of RAM on it, and I have already a 16KW board. If I want to further
> expand the RAM, and say I buy another 16kW board, that makes an arithmetic
> sum of 32kW for the boards, making 36kW total. Can the 4kW of on-board RAM
> be disabled, and only the 32kW on the boards be used? Is it ok for the
> installed RA mto overlap the 8kW at the high memory area? Do the devices
> spoof these addresses or do they read/write in the high installed RAM area?
>
> Paul
>

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