The U 880 CPU within the Robotron 1715

The U 880 CPU within the Robotron 1715 A PROJECT BY Johannes Jähn Michael Riedl Florian Leithäuser Gerd Utecht For Prof. Dr. Abzug, CS 350, 12/08/1998

The U 880 CPU within the Robotron 1715 Personal Computer PC 1715, 1715 W Build from by 1985 to 1990 VEB Büromaschinenwerke Sömmerda Most common OS’s SCP 3. 2, CP/A, BROS, JAMP Size (Wx. Dx. H) in cm 50 x 40 x 14 Weight Kg 12, 8 Languages Basic, Pascal, Assembler, Fortran

The U 880 CPU within the Robotron 1715 CPU Clock Speed Registers RAM ROM Interfaces Resolution FDDs etc. Kind of Case Keyboard UA 880 4 MHz 8 bit 64 KB (Max. 256 KB) 2 KB Keyboard, Monitor, V. 24, 2 x FDD slots, Printer Text: 64 x 16 or 80 x 24 2 x 5, 25" FDD, @ 720 KB Desktop with FDD, separate monitor & keyboard QWERTY, separate number block, 98 keys 15 Function keys

The U 880 CPU within the Robotron 1715 Instruction Set: 131 native instructions 177 additional instructions 1, 2, 4, 8 & 16 bit instructions all common shift operations ( logical, arithmetical, circular) based on Z 80 instructions but not compatibale

The U 880 CPU within the Robotron 1715

The U 880 CPU within the Robotron 1715

The U 880 CPU within the Robotron 1715

The U 880 CPU within the Robotron 1715 Addressing Modes: • Direct Mode • Immediate Mode • Indexed Mode • Indirect Mode

The U 880 CPU within the Robotron 1715

The U 880 CPU within the Robotron 1715 The Memory Organization A) 64 k version Addressing from 0000 - FFFF + external 2 k ROM + 2 k Interlace Refresh Memory B) 256 k version Addressing from 00000 - 3 FFFF + external 2 k ROM + 2 k Interlace Refresh Memory

The U 880 CPU within the Robotron 1715 THANK YOU! Please download our presentation and term paper at http: //www. riedl. com/cs 350. zip