booting os/8

Don North north at
Wed Mar 22 16:30:40 CDT 2017

On 3/22/2017 10:47 AM, Bill Gunshannon via cctalk wrote:
> ________________________________________
> From: cctalk [cctalk-bounces at] on behalf of W2HX via cctalk [cctalk at]
> Sent: Tuesday, March 21, 2017 11:49 PM
> To: General Discussion: On-Topic and Off-Topic Posts (cctalk at
> 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.
> 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
> ___________________________________________
> 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:   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:

aka AK6DN

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