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Update... I stripped down my 11/53 to just the CPU (KDJ11-D/S with 1.5MB), two 1MB memory modules, and the RQDX3 disk controller. I have no problem booting from the image, and the identification option indicates that it sees FPP capability. Running the test, however, brings no joy. After...

When I get a chance I will try this image on my PDP-11/53...

I thought I would download these and give them a spin on my PDP-11/53 - here's how it went (spoiler alert - it went well!) I'm using my GOTEK as the "floppy drive", so I needed to convert the .DSK files from logical to physical format, using a utility provided by forum member gslick called...

Maybe some bad or broken bypass caps?

Once I get some feedback from a few people and I am sure the design is stable, I will be glad to share that information.

I'd be happy to send you one... I'll need your mailing address. I will send you a direct message with my email address so you can reply to me... Jon.

Hello All, I'm running RT-11XM V5.07 on a PDP-11/53 with 3.5MB of RAM. I have some files on a PC that I would like to get on to a PDP-11 disk... The only way I can think of doing it is using KERMIT. I found KERMIT.SAV on an RX33 floppy, but when I try to invoke it I get the following error...

Thanks for all this! Jon.

Hmmm, the link takes me to a page about replacing the leader on a TK50 tape drive... Regarding simh... is there a MicroVAX2 model already built someplace?

When I tried to boot one of the .img diagnostic files, I get the following error: "?43 FILESTRUCT, DUA1" However, the .DSK files you attached do boot - thanks! As I understand it, you would use ImageDisk to convert the .img file to a .IMD file, then use it again to convert the .IMD file to a...

Hello All, I have a couple of systems that I am working with... one is a PDP-11/53 and the other is a MicroVAX2 (KA630 CPU), both in BA23 chassis. I have been experimenting with the GOTEK floppy emulator running the latest version of FlashFloppy, and I have it working fine as an RX33 with the...

If you have a scope, trigger it on pin 12 (Dot Clk) and observe pin 17 (Video Out) to see if there is actually a bit stream being generated. You could also use your logic analyzer. Similarly, have a look at pin 19 (VSR Load) to see if the parallel data is being loaded into the shift register...

OK - I have a couple near-final prototypes built. Is anyone out there willing to take one and try it out? It should interface to any PS/2 keyboard (I haven't tried it using a USB keyboard with a USB-to-PS/2 adapter), and I'll include the cord with the 1/4" plug. All I'm asking is that you...

Yes, I'm sure there are many cheaper solutions... However, due to the clever signaling between keyboard and monitor, it made sense to me to replicate the DEC design and use the 6402 UART, which fixes part of the expense. If this were intended to go into high-volume production, cost would...

I've ordered the (hopefully) final/production version of the PCB. It will take a couple of weeks to receive it and test it out. I'll keep you all posted on this thread.

Hmmm, I guess I could assemble them myself if there are only a small number, like I did with the MXV/BVD board... with a stencil it doesn't take too much effort...

I imagine so, and probably a lot simpler, from a circuit perspective. For the VT10x family, DEC used a pretty clever and complicated communication scheme between the monitor and keyboard that mixes clock and bi-directional data all on a single wire. Later keyboard interfaces are simpler, I...

I'm currently using an STM32F302CB at 64MHz, mostly because I have a bunch of them on hand and they only cost about $7 each. It is overkill for the application, but I am pretty familiar with it and I wasn't trying to minimize the cost. Regarding the software - all my code is developed using my...

Hello All, I've noticed that there any number of VT10x monitors for sale on Ebay, but without the standard VT100 keyboard to go with them, and if you can find a keyboard, they are pretty pricey. I managed to get my hands on a VT101 monitor (no keyboard), and I decided to design a board that...

Hello All, I've been working with a couple of TK50 tape drives, and I have them working with my PDP-11/53. I can read, write, and delete files, and I can make backups of the hard drives. The things that are hard to come by are actual tape cartridges with useful data on them. So, I am...