22 Mar
2017
22 Mar
'17
11:25 p.m.
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From: cctalk [cctalk-bounces at classiccmp.org] on behalf of Don North via cctalk [cctalk
at classiccmp.org]
Sent: Wednesday, March 22, 2017 5:30 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: booting os/8
On 3/22/2017 10:47 AM, Bill Gunshannon via cctalk wrote:
________________________________________
From: cctalk [cctalk-bounces at classiccmp.org] on behalf of W2HX via cctalk [cctalk at
classiccmp.org]
Sent: Tuesday, March 21, 2017 11:49 PM
To: General Discussion: On-Topic and Off-Topic Posts (cctalk at classiccmp.org)
Subject: booting os/8
Hi folks,
I have a PDP-8/e that I've been working on. I have completed construction of
AK6DN's RX01/02 emulator. I got to the step tonight where I was trying to boot an OS/8
disk image and nothing was happening. I realized that I do not have the bootstrap diode
board in my 8/e so begin the bootstrap triggered by the "SW" switch.
Does anyone have the program I can toggle in for the bootloader? What I found is somewhat
confusing. Here is a discussion on this topic.
https://groups.google.com/forum/#!searchin/alt.sys.pdp8/RX01$20boot|sort:re…
It seems one fellow was attempting to edit/improve the bootloader of another fellow. I
was wondering if anyone has distilled this into something simple. At the moment, I care
only about booting from RX01-Disk0.
Any pointers greatly appreciated. Thanks
Eugene W2HX
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Well, I am sure glad someone posted this. I had never heard of the work done by AK6DN
and have considered
looking into such a project in the past.
So, has anyone looked at someting sililar for RL drives?
bill
Look here: http://www.vcfed.org/forum/blog.php?12663-AK6DN for info on my Arduino
based RX02 emulator using a microSD card.
Works on RX11/RXV11/RX8E as RX01, RX211/RXV21/RX28 as RX02. Passes DEC hardware
diagnostics.
Reinhard has done an FPGA based RL01/2 drive emulator, see:
http://www.pdp11gy.com/indexE.html#file:///E:/homepage/indexE.html
Don
aka AK6DN
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I saw that. I ordered a set of boards from OSHPark today. Once they come I will see
about ordering the
parts and building at least one. I may wish I had more controillers. :-)
I will take a look at the FPGA solution. But I still have to ask, is there any reason why
it could not be done
with an Arduimo like the RX emulator? I haven't researched it deeply, but I never
thought the RL drive
itnerface was all that complex.
bill