MMC64 Browser has the ability to send screenshots through Silversurfer connected to RR, but I can't remember if I included it in released non-betas.
I've also written XModem-compatible program starter, here is the blurb I wrote in Lemon64:
If anyone needs it, go and get my
Xmodem thingy for Retro Replay + Silversurfer (+ MMC64) combination. It doesn't set BASIC end pointer, so you can use it only for programs which don't require that.
If you load it from MMC64, then just reset after loading, F7 twice and
SYS $CE00 to start, otherwise simple
RUN will do. After starting it send any C64 program ($0800..$CBFF or $D000..$FFFF) with
properly working xmodem client. TeraTerm Pro has way too agressive resending timeout, but HyperTerminal (yuck!) works, as do most sz implementations. If the program hangs with white or red background color then transfer got out of sync, just run/stop+restore and retry with
SYS $CE00.
Serial settings are 8n1 at 115200 bauds, hardware handshake. Xmodem-CRC & Xmodem-1K works. Simple checksum mode is not implemented.
Edit: at nearly 9300 cps I believe it now being among the fastest Xmodem implementations for C64. Maximum speed for non-handshaked transfer is only 2000 cps higher on my system.
I also have proof-of-concept code for 230kbps loader, but it needs custom program on PC side. Less than 3 seconds to transfer 64 K
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