radardoug
Well-known member
Yes, the early LARCs were metal, but it was before they had come up with the name. I would be very interested in this, maybe PM me?
radardoug said:I'm building a copy of the LARC, just got to do some work with interfacing it to a 224, it works fine on the 480.
teddd said:The exception (there is always an exception) being the audio levels - I believe the 224XL sends the audio levels to the LARC on a regular basis. The 224X used to have a very crude 5 LED VU bar graph, and the 224XL sends the same 5 bits of information to the LARC, where the local software implements a smooth fallback to make it look more appealing when displayed on 16 LEDs instead of 5.
Comms are not encrypted in any way.teddd said:I'm pretty sure there is no encryption to the data exchange, and if masking is used it is very light masking (perhaps an XOR with a fixed value or something similar). Two ways to dive deeper - snoop on the RS-422 link and infer the protocol. or decompile the LARC's ROM. Neither are particularly onerous - there's not much to the LARC's protocol, and the 8749 only contains 2K of code and 128 storage locations.
Enter your email address to join: