RCA CDP18S711 manual Cassette Attachment Diagram Cassette Phase Test, Test Program, Signals

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Cassette Attachment Diagram

30	RCA COSMAC VIP Instruction Manual

Cassette Attachment Diagram

Cassette Phase Test

For best results your cassette recorder should not reverse the phase of an input signal on playback. When playing back a tape recorded on another recorder, it should not reverse the phase of the output signal. You may have to reverse the internal head connections on some cassette recorders to eliminate unwanted phase reversals.

To check for phase reversals, load the machine language test program, given below, into memory.

Run this program to generate a phase test signal on the tape out line. Record one minute of this test signal, then play it back and observe the cassette recorder output on a scope. It should appear as shown in B or C below. Save this tape to test new recorders on which you want to play tapes you have recorded on a previously tested machine. If the playback signal appears upside down from that shown in B or C, you will have to reverse the internal head connection leads on the out-of-phase recorder.

Test Program

0000	F8	04	AA	7B	F8	0C	FF	01
0008	3A	06	7A	F8	0C	FF	01	3A
0010	0D	2A	8A	3A	03	F8	60	FF
0018	01	3A	17	30	00	00	00	00

Signals

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Contents Page VIP-311 RCA COSMAC VIP CDP18S711 Instruction ManualACKNOWLEDGMENT Contents Contents Continued What This Manual Covers 1. Getting StartedThe Power Supply 1. Getting Started What You SeeTurning It On Memory Write Using the Operating System11.COSMAC VIP Operation Tape Read Memory ReadTape Write 11.COSMAC VIP Operation Testing Your Cassette SystemBranch Instructions How to Change and Use the VariablesIII.CHIP-8Language Programming Using the Display Instructions 0200 A20A I=020A 0202 6100 V1=00 0204 6200 V2=00 III. CHIP-8 Language Programming0206 D125 SHOW 5MI@VlV2 0208 1208 GO 020A F090 020C F090 020E F000Applying CHIP-8 111. CHIP-8Language Programming Some Program Ideas25.PROGRAMMED SPOT - Introduce children to programming concepts by letting them preprogram the movements of a spot or object on the screen VIP Machine Coding IV. Machine Language ProgrammingMachine 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 V1. Expansion Considerations and Connections Using the Byte Input/OutputI 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 Other Problems VIL Troubleshooting HintsSignal 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 Memory Test Program Cassette Recording GuidelinesOperating System Listing Appendix B - Operating SystemR3 = Machine Language Subroutine Program Counter Operating System Register TableOperating System Summary CHIP-8Interpreter Listing Appendix C - CHIP-8InterpreterInterpreter CHIP-8Memory MapCDP1802 Register Use for CHIP-8 Appendix C - CHIP-8Interpreter RCA COSMAC VIP Instruction Manual CHIP-8User NotesPage 1. VIP Kaleidoscope 2. VIP Video Display Drawing Game Fig. E-5Power Supply Circuit and Byte Appendix E - Logic DiagramsFig. E-1Microprocessor and Display Interface CircuitsPage Appendix E - Logic Diagrams Fig. E-2- ROM Circuits and Expansion InterfacePage Appendix E - Logic Diagrams Fig. E-4- RAM CircuitsRCA COSMAC VIP Instruction Manuel RCA COSMAC VIP Instruction Manual Appendix F Board Layout, Parts List, and Expansion Notes2.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 Resistors - Supplied 1 /4 W except as noted RCA COSMAC VIP Instruction ManualPage 3. COSMAC VIP Expansion Notes