General Information
The RCA COSMAC Development Systems, the CDS II and II, are two of several models of the COSMAC 1802 development kits sold by RCA. All information to build these emulators was based on the MPM-216, MPM 232 and MPM233 Manuals.
The emulation in Emma 02 includes 4 to 28 kilobytes of RAM, 2 kilobytes of ROM. ROM Software includes a resident monitor program UT20 in the CDS II and UT21 in the CDSII.
Command summary for the UT20 and UT21:
- ?Mxxxx y: Memory display of y bytes from address xxx
- !Mxxxx bytes: Memory loading of bytes to address xxxx
- $Uxxxx: Start execution at address xxxx (with floppy disk and terminal I/O enabled)
- $Pxxxx: Start execution at address xxxx (with floppy disk and terminal I/O disabled)
- $L: Load from floppy disk (not working in Emma 02)
- $C: (UT21 only) Load CDOS operating system from floppy disk (not working in Emma 02)
- ?R: Register display as stored in register RAM at 0x8C00
Technical specifications
Clock: 2.0 MHz
Memory:
4 KB RAM in the CDS II and 28KB RAM in the CDS III
2 KB ROM
Screen shot
CDS III running UT21 on a video terminal.
Links
Other information about the RCA COSMAC Development System:
Main Features RCA Microboard Computer Development System Emulator
- Adjustable speed, boosting the speed of the CDS II and III beyond 2.0 MHz!
- Direct CDS memory access to load and save software from the PC hard disk via intel hex or binary files
- Terminal simulation (DEC VT-52 and VT-100)
- Support for Printer simulation including possibility for sending the output to any printer you own or to a file
- Video screen dump to a file (BMP, JPEG, PNG or PCX image)