carnival troubleshooting information

This was started as a troubleshooting guide for Carnival, however most of this information besides the ROM signatures should apply to any of the Sega VIC/VIC dual based games.

Information on Carnival RAM

RAM range 0x8000 - 0x8FFF
Each RAM chip holds 1 bit of the each address

Chip location	Bit
U76	Bit 0
U75	Bit 1
U74	Bit 2
U73	Bit 3
U72	Bit 4
U71	Bit 5
U70	Bit 6
U69	Bit 7

Information on Carnival ROMs

Range	Fluke Checksum	ROM location
0x0000 - 0x3FFF	271a	All ROMS (u31-u26, u7-u1)

Range	Fluke Checksum	ROM location
0x0000 - 0x1FFF	73e0	Top Row (u33-u26)
0x0000 - 0x03FF	9359	u33
0x0400 - 0x07FF	859b	u32
0x0800 - 0x0BFF	c101	u31
0x0C00 - 0x0FFF	26bf	u30
0x1000 - 0x13FF	2b81	u29
0x1400 - 0x17FF	b7e8	u28
0x1800 - 0x1BFF	a5f0	u27
0x1C00 - 0x1FFF	05d9	u26

Range	Fluke Checksum	ROM location
0x2000 - 0x3FFF	e212	Buttom Row (u7-u1)
0x2000 - 0x23FF	a4de	u8
0x2400 - 0x27FF	a3fe	u7
0x2800 - 0x2BFF	8909	u6
0x2C00 - 0x2FFF	ccdb	u5
0x3000 - 0x33FF	f52d	u4
0x3400 - 0x37FF	29b6	u3
0x3800 - 0x3BFF	3fd8	u2
0x3C00 - 0x3FFF	e09f	u1

miscellaneous signals

Signal output from U19

Signal output from U20

Trouble shooting the coin up circuit

Perform the following steps/tests in ORDER, do NOT skip, each step is a prerequite to the next. If one of the steps fixes the problem, then stop.

1. Build this coin up test harness, as shown in picture below
• Get a 9 pin Molex KK type (".1") header plug.
• Take a 10000 Ohm resistor and plug it into the headers between pin #1 and #4 on the header sockets.
• Take a normal joystick microswitch, connect the "NO" terminal to pin #6 on the main logic board headers
• connect COMMON on the microswitch to pin #7 on the logic board headers
• connect the "NC" terminal to ping #8 on the main logic board headers.
• Make sure pini #2,#3, #5 and #9 are blank/empty
  
2. Unplug the coin meter from the PCB board
3. Unplug the photo coin calculators from the PCB board
4. Plug in your test circuit, pin #1 on the test harness to pin #11 on the PCB board, pin #9 on the test harness to pin #18 on the PCB board, as shown in the picture above.
   
5. Setup a logic Probe (a voltimeter should work OK) and a ohmeter
6. Check continuity between pin #15 on the PCB header and pin #4 @ U62 (74LS00), find break if continuity is bad (it should be about 330 Ohms)(only component between is R31)
7. Check continuity between pin #17 on the PCB header and pin #10 @ U62 (74LS00), find break if continuity is bad (it should be about 330 Ohms) (only component between is R32)
8. Turn on the game
9. set logic probe on pin #6 of U62, hit the button on the test harness, ensure the logic probe changes states when you press the microswitch contact, if not replace U62
10. set logic probe on pin #8 of U62, hit the button on the test harness, ensure the logic probe changes states when you press the microswitch contact, if not replace U62
11. Turn off the game
12. with multimeter check continuity between pin #6 on U62 and the base (B) of Q4, resistance should be about 1K Ohms, if not replace R11 or find the break in the trace and repair.
13. Turn on the game
14. place your logic probe on the Collector (C) of the 2N4401 @ Q4, it should be high, press the button on the microswitch, it should go low, if not replace Q4
15. place your logic probe on the Emmiter of (E) if the PE8050 @ Q3, it should be high, press the button on the microswitch, it should transistion low, if not replace Q3
16. Place your logic probe on pin #2 of 74LS08 @ U35, it should be high. Prese the button on the microswitch it should go go low then back high, if not verify that R8 (470 ohm resitor), D3 (IN914 diode), C29 (.1uf cermamic capacitor) , D4 (IN4002) and R10 (10000 ohm resistor) are OK.
17. Place your logic probe on pin #3 of 74LS08 @ U35, it should be high. Prese the button on the microswitch it should go go low then back high, if not replace U35.
18. Turn off game
19. Test continuity from pin #8 of U62 to pin #11 of U43, if no continuity find and replace break in trace
20. Test continuity from pin #8 of U43 to pin #13 of U253, if no continuity find and replace break in trace
21. Turn game back on
22. place logic probe on pins #8 of 74LS74 @ U43, then test pin #9, make sure they are the opposite of each other, if not replace U43
23. If everything is OK to this point and the game boots up to the attract mode, replace U24 (74LS02)
24. if that did not changes anything replace U45 (74LS253)

    If you are using a VIC 1 board (like Head On) setup the connector as shown in this picture

    Information on Sounds

    The sounds in carnival are triggered by writting certain bits to an IO address. The data is read directly off the data bus by 2 74LS374 flip flops at U63 and u64. For the sounds in the table below you can test the sound by manually grounding the respective pin. Here is the information

    PCB header pin	Sound	Chip U63 or U64	Pin on chip	I/O address	Bit position (0-7)
    29	Bonus #2	U64	12		7
    30	Bonus #1	U64	9		6
    31	Pipe	U64	15		5
    32	Duck #3	U64	6		4
    33	Duck #1	U64	5		2
    34	Duck #2	U64	16		3
    35	Clang	U64	19		1
    36	Rifle	U64	2		0
    43	Ranking	U63	15		5
    45	Bear	U63	5		2

    Main PCB header pins 41,42,47 and 48 are unused

    Carnival, Main PCB to Music Board

    PCB header pin	Sound	Chip U63 or U64	Pin on chip	I/O address	Bit position (0-7)
    44	??? to Music Board	U63	6		4
    46	??? to Music Board	U63	16		3

    Main PCB header pins 49-52 are to provide power to the sub boards.

    PCB header pin	Voltage
    49	+12
    50	-12
    51	Ground
    52	+5

    0xc000 - 0xc37F - tiles
    0x93:0 -> 0x9c: 9
    

    Tiles (bottom left = 0x00, moving up and over to the right)
    

    Note: pulsar has the entire alphabet at it's ASCII values (0x41 = A - Z), and 0-9 at (0x30 - 0x39)

    Important Note: The carnival hardware has ROM from 0x0000 - 0x3FFF HOWEVER it is mirrored into 0x4000 - 0x7FFF and this mirror MUST exist! The code calls routines in this upper address space (0x4000 etc) so if it's not mirrored things don't work!
    

    RAM is also from 0x8000 - 0x8FFF but the hardware maps this into each areas (0x9000 - 0x9FFF, 0xa000 - 0xaFFF... 0xf000 - 0xffff) but the range at least in carnival uses 0xe000 - 0xefff
    

    Schematics for Dual Vic board