RCA CDP18S711 manual VIP Kaleidoscope

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1. VIP Kaleidoscope

This program uses the CHIP-8 INTERPRETER at

0000-01FF. Four spots appear in a group at the center of the screen. Press keys 2, 4, 6, or 8 to create a pattern. Keep your pattern smaller than 138 key depressions. Push key 0 to terminate pattern

RCA COSMAC VIP Instruction Manual

entry. Pushing key 0 causes your pattern to be continuously repeated forming a fascinating, changing kaleidoscope display on the screen. A "44444442220" key sequence provides a very nice effect Experiment to find other nice patterns. The subroutine at 0232-0274 causes your pattern to be duplicated in the four quadrants of the screen.

0200	6000	V0=00	023C	7101	V1+01
0202	6380	V3=80	023E	4008	SKIP;V0 NE 08
0204	611F	V1=1F	0240	7201	V2+01
0206	620F	V2=0F	0242	A277	I=0277
0208	2232	DO 0232	0244	6AEO VA=E0
020A	A200	I=0200	0246	8A12	VA=VA&Vl
020C	F31E I=I+V3		0248	6B1F VB=1F
020E	F00A V0=KEY		024A	81B2	VI=Vl&VB
0210	F055	MI-V0:V0	024C	3AOO SKIP;VA EQ 00
0212	4000	SKIP;V0 NE 00	024E	7201	V2+01
0214	121C	GO 021C	0250	6AFO VA=FO
0216	7301	V3+01	0252	8A22	VA=VA&V2
0218	3300	SKIP;V3 EQ 00	0254	6BOF VB=OF
021A	1208	GO 0208	0256	8282	V2=V2&VB
021C	6380	V3=80	0258	3AOO SKIP; VAEQ 00
021E	A200	I=0200	025A	7101	V1+01
0220	F31E I=I+V3		025C	6BIF VB=1F
0222	F065	VO:VO=MI	025E	81B2	Vl=Vl&VB
0224	4000	SKIP;VO NE 00	0260	D121	SHOW 1MI@VlV2
0226	121C	GO 021C	0262	8A10	VA=Vl
0228	7301	V3+01	0264	6B1F VB=1F
022A	4300	SKIP;V3 NE 00	0266	8B25	VB=VB-V2
022C	121C	GO 021C	0268	DAB1 SHOW 1MI@VAVB
022E	2232	DO 0232	026A	6A3F VA=3F
0230	121E	GO 021E	026C	8A15	VA=VA-VI
0232	4002	SKIP;V0 NE 02	026E	DABI SHOW 1MI@VAVB
0234	72FF V2+FF		0270	8B20	VB=V2
0236	4004	SKIP;VO NE 04	0272	DAB1 SHOW 1MI@VAVB
0238	71FF VI+FF		0274	00EE RET
023A	4006	SKIP;V0 NE 06	0276	0180
			0278	0000

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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 What You See Turning It On1. Getting Started Using the Operating System 11.COSMAC VIP OperationMemory Write Memory Read Tape WriteTape Read 11.COSMAC VIP Operation Testing Your Cassette SystemHow to Change and Use the Variables III.CHIP-8Language ProgrammingBranch Instructions Using the Display Instructions 020C F090 020E F000 III. CHIP-8 Language Programming0200 A20A I=020A 0202 6100 V1=00 0204 6200 V2=00 0206 D125 SHOW 5MI@VlV2 0208 1208 GO 020A F090Applying 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 V. Logic Description How Memory Is AddressedHow the Input/Output Works 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/OutputUsing the Expansion Interface Some Expansion IdeasI RCA COSMAC VIP Instruction Manual Pin Signal V1. Expansion Considerations and ConnectionsTable III - External Option Terminal Connections 2.Composing poetry or pictures with printer output No Sound VIL Troubleshooting HintsOther Problems Signal TracingLast Resorts Appendix A - Test and Operating Data Byte Pattern for Displaying COSMACBeeper Program Cassette Attachment Diagram Cassette Phase Test SignalsTest Program Cassette Data Test Memory Test Program Cassette Recording GuidelinesOperating System Listing Appendix B - Operating SystemOperating System Register Table Operating System SummaryR3 = Machine Language Subroutine Program Counter CHIP-8Interpreter Listing Appendix C - CHIP-8InterpreterCHIP-8Memory Map CDP1802 Register Use for CHIP-8Interpreter Appendix C - CHIP-8Interpreter RCA COSMAC VIP Instruction Manual CHIP-8User NotesPage 1. VIP Kaleidoscope 2. VIP Video Display Drawing Game Circuits Appendix E - Logic DiagramsFig. E-5Power Supply Circuit and Byte Fig. E-1Microprocessor and Display InterfacePage 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 1.Printed Circuit Board Layout Board Layout, Parts List, and Expansion NotesAppendix F 2.Parts List for RCA COSMAC VIP CDP18S711RCA 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