Schema of the internal firmware board 300dpi scan
Firmware in HEX-Intel
Internal 50 connector pinout.
Description of the interface.
ROM board component side (600dpi)
ROM board solder side (600dpi)
MDCR-DCE board component side (600dpi)
MDCR-DCE board solder side (600dpi)
DBL 2.* is the autoloader for MDCR systems. It consists of a boot loader program at the start of the tape. If the MTOS detects at reset the tape is write protected, it attempts to load a program "USER" from tape. This routine is started, and it loads and runs the next BASIC program, usually an index of programs. The version I have is 2.1.
To copy the boatloader, read it from tape with the monitor (UT) with R. Then load a new empty, rewound tape and write it with W2F0 40A USER, ('2F0' and '40A' being start and end address of the routine).
This information is from: DAInamic 12, p.283-288;