________________________________________ From: cctalk [cctalk-boun...@classiccmp.org] on behalf of Don North via cctalk [cctalk@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-boun...@classiccmp.org] on behalf of W2HX via cctalk > [cctalk@classiccmp.org] > Sent: Tuesday, March 21, 2017 11:49 PM > To: General Discussion: On-Topic and Off-Topic Posts (cctalk@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:relevance/alt.sys.pdp8/9-GCoA0PCLA/370T3R-Ru_AJ > > 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: 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 ______________________________________________ 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
