RCA CDP18S711 manual What You See, Turning It On, Getting Started

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1. Getting Started

What You See

You must now decide on the video display for your computer. The video pad at the back right comer of the COSMAC VIP card provides a video signal which you can connect directly to the high-impedance input of most standard video monitors. The horizontal sync frequency is 15,720 Hz and the vertical sync frequency is 60 Hz. One solution to your video display need is a commercial video monitor having a suitable input -- not rf or antenna input. Another option is your TV receiver used with a relatively inexpensive FCC-approved modulator. Do not use a standard TV receiver with the VIP output connected to the VHF or UHF antenna terminals. Do not use transformerless TV receivers.

Turning It On

After attaching a suitable video display, apply power. Make sure the RUN switch is in the down (or reset) position. Hold hex key C down while you flip the RUN switch up. You should hear a tone with key

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C pressed and the Q light should be on. When you release key C the tone and Q light should both go off. (The tone occurs whenever the Q light is on.) You should now see a random pattern of small square spots on the display. Push hex keys 8008 in sequence and you should see 8008 at the bottom left of the screen and 64 at the lower right. Adjust your display controls for the best picture (white spots on a-black background). You can experiment with changing the values of RI, R2, and R4 on the COSMAC VIP card to improve picture quality although this step shouldn't be necessary. Certain modulators work better with an R4 of 1 kilohm instead of 200 ohms. If you don't get a video picture refer to Section VII for troubleshooting hints.

After completing the above set-up procedure, you are ready to enter and run programs on your COSMAC VIP.

The COSMAC VIP operating system, explained in the next section, permits you to load programs into memory from the hex keyboard, verify them, and record them on cassettes for later reuse.

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Contents Page RCA COSMAC VIP CDP18S711 Instruction Manual VIP-311ACKNOWLEDGMENT Contents Contents Continued 1. Getting Started What This Manual CoversThe Power Supply 1. Getting Started What You SeeTurning It On Memory Write Using the Operating System11.COSMAC VIP Operation Tape Read Memory ReadTape Write Testing Your Cassette System 11.COSMAC VIP OperationBranch Instructions How to Change and Use the VariablesIII.CHIP-8Language Programming Using the Display Instructions III. CHIP-8 Language Programming 0200 A20A I=020A 0202 6100 V1=00 0204 6200 V2=000206 D125 SHOW 5MI@VlV2 0208 1208 GO 020A F090 020C F090 020E F000Applying CHIP-8 Some Program Ideas 111. CHIP-8Language Programming25.PROGRAMMED SPOT - Introduce children to programming concepts by letting them preprogram the movements of a spot or object on the screen IV. Machine Language Programming VIP Machine CodingMachine Language Programming Summed Up How the Input/Output Works V. Logic DescriptionHow Memory Is Addressed pressed. A 62 machine instruction causes the least significant 4 bits of memory byte to be latched into U13. These 4 bits are decoded to bring one of the 16 U13 output lines low. If the key that corresponds to this output line is pressed, the CDPI802 EF3 input will go low. The 4-bitcodes latched into U13 correspond to the equivalent key positions. After the program send8 a 4-bitcode to U13, it subsequently examines the EF3 line to see if the key corresponding to this code is pressed or not. In this manner, a program can determine when any specific key is pressed or can sequentially scan all keys while waiting for any one to be pressed. Key debounce delays must be provided in the program when required. A program can also cause a speaker tone to occur when a key is pressed. Only one key at a time should be pressed with this method of interfacing the keyboard Using the Byte Input/Output V1. Expansion Considerations and ConnectionsI RCA COSMAC VIP Instruction Manual Using the Expansion InterfaceSome Expansion Ideas Table III - External Option Terminal Connections Pin SignalV1. Expansion Considerations and Connections 2.Composing poetry or pictures with printer output VIL Troubleshooting Hints Other ProblemsSignal Tracing No SoundLast Resorts Beeper Program Appendix A - Test and Operating DataByte Pattern for Displaying COSMAC Test Program Cassette Attachment Diagram Cassette Phase TestSignals Cassette Data Test Cassette Recording Guidelines Memory Test ProgramAppendix B - Operating System Operating System ListingR3 = Machine Language Subroutine Program Counter Operating System Register TableOperating System Summary Appendix C - CHIP-8Interpreter CHIP-8Interpreter ListingInterpreter CHIP-8Memory MapCDP1802 Register Use for CHIP-8 Appendix C - CHIP-8Interpreter CHIP-8User Notes RCA COSMAC VIP Instruction ManualPage 1. VIP Kaleidoscope 2. VIP Video Display Drawing Game Appendix E - Logic Diagrams Fig. E-5Power Supply Circuit and ByteFig. E-1Microprocessor and Display Interface CircuitsPage Fig. E-2- ROM Circuits and Expansion Interface Appendix E - Logic DiagramsPage Fig. E-4- RAM Circuits Appendix E - Logic DiagramsRCA COSMAC VIP Instruction Manuel RCA COSMAC VIP Instruction Manual Board Layout, Parts List, and Expansion Notes Appendix F2.Parts List for RCA COSMAC VIP CDP18S711 1.Printed Circuit Board LayoutRCA COSMAC VIP Instruction Manual Page 2. Parts List for RCA COSMAC VIP CDP18S711 Page RCA COSMAC VIP Instruction Manual Resistors - Supplied 1 /4 W except as notedPage 3. COSMAC VIP Expansion Notes