BK-0010

Here is a list of emulators for Windows. The list says there are better options, but I prefer to stick to one I'm most familiar with, Bashkiria-2M emulator (called just Emu).

So far I have found about 5 beeper editors, but was able to load and hear something from with only one, with a 3-channel engine, called Klavesin (attached).

How to get it started:

Start Emu
Select BK-0010_01
File/Open, set filter to all, select klaves.bin

All others are disk based ones, so you have to be a bit familiar with the MK-DOS on BK-0011, which looks much like Norton Commander from DOS era. Then it gets worse, as neither of the editors have a demo song loaded (but there are some on disks), it is all in Russian, and it considers you know something about the thing. So I wasn't able to figure out any of those yet. Seen that one has loadable 2-ch and 4-ch drivers and a few songs ripped from ZX Spectrum (judging by the filenames).

Yes, it is direct bit-banging just like on ZX. There is register 177716 (oct), bit 6 drives both speaker and tape output.

BK uses a PDP-11 compatible single chip CPU, but other than that it is not compatible. It has either a BASIC or FOCAL built-in interpreter (different models), custom graphics mode, etc.

I vaguely remember there was a Tritone port to UT-88 with 8253, just three channels of square wave without duty cycle or different volumes. Maybe it was Apogee or Vector-06C, though. These two has 8253 built-in as well, with all three channels routed to the speaker. All of these are 8080-based machines.

There is also BKBTL that has a Qt port and is supposedly works under Linux.

To be honest, I have no idea what the BIN format is, and where it comes from.

177716 has a lot of other stuff, ranging from tape controls to CPU reset vector (!). Don't forget, it is a 16-bit register with plenty a bits on a really oldschool architecture.

I was able to run Klavesin in BKBTL Windows, using the BK 0010.01 FDD configuration. Reset machine, Load BIN, then it'll automatically type in S1000 command (start from the load address). Press Enter, and it starts. Had to also enable sound emulation, it was disabled by default.