IC inventory

27128×13

16K x 8 EPROM. The graphics store: background tile ROMs on the C board, sprite bitmap ROMs on the B board, character shapes on the A board.

2114×6

1K x 4 static RAM. Used in pairs to make a byte wide - the 96-object sprite entry store and the sprite work RAM.

2148H×3

1K x 4 static RAM, faster than the 2114. The two sprite line buffers: a pair per buffer, addressed by the 9-bit X counter, with bit 8 wired to /CE so sprites clip at the right edge.

M58725×2

2K x 8 static RAM. Work and video RAM.

27256×1

32K x 8 EPROM. The main program ROM. On the clean board this socket holds two stacked 27128s instead, split by address.

YM2203×2

FM + PSG sound chip (OPN). Two of them, addressed at 8000-8003. Wired write-only here - /RD is tied high and /WR grounded, so accesses are timed purely by chip select.

YM3014×2

Serial DAC. Converts each YM2203's FM output to analogue for the amplifier.

LM324×1

Quad op-amp. Mixing and filtering the PSG and FM channels on the main amp sheet.

74LS273×15

Octal D flip-flop with clear. Byte-wide registers - sprite attributes, scroll position, colour output.

74LS161×9

4-bit synchronous counter with asynchronous clear. The H and V video counters that generate the whole raster.

74LS174×7

Hex D flip-flop. Timing and pixel latches.

74LS163×6

4-bit synchronous counter with synchronous clear. The sprite line-buffer X counters, three cascaded into a 9-bit count.

74LS175×3

Quad D flip-flop with complementary outputs.

74LS373×1

Octal transparent latch.

74LS374×1

Octal D flip-flop with tri-state outputs. The sound-command mailbox between the two CPUs.

74LS86×16

Quad XOR. The flip logic: XORing a counter against FLIP mirrors the screen, which is how the cocktail cabinet flips the picture for player two.

74LS74×11

Dual D flip-flop. Sync and blanking latches, the interrupt chain, the DMA handshake.

74LS04×9

Hex inverter. Also used throughout as a buffer, and as the source of the alpha/beta copies of FLIP, V1 and the pixel clock.

74LS08×8

Quad 2-input AND.

74LS32×6

Quad 2-input OR. Occasionally used with both inputs tied as a plain buffer.

74LS00×3

Quad 2-input NAND.

74LS20×3

Dual 4-input NAND. One of them (1L on the B board) is the sprite transparency test - a gate per line buffer, drawn on two different sheets.

74LS10×2

Triple 3-input NAND.

74LS112×1

Dual JK flip-flop. The horizontal blanking latch.

74LS30×1

8-input NAND. Decodes the V counter reaching line 248 to set the VSYNC latch.

74LS157×13

Quad 2-to-1 multiplexer. Switches video RAM address between the CPU and the display counters.

74LS245×12

Octal bidirectional bus transceiver. Bus isolation, and the direction reversal that lets the B board read sprite data out of the A board's RAM during blanking.

74LS367×9

Hex buffer with tri-state outputs. Reading the control panel and DIP switches onto the data bus, and timing fan-out.

74LS138×8

3-to-8 line decoder. Address decoding and the read/write strobes.

74LS257×7

Quad 2-to-1 multiplexer with tri-state outputs. The line-buffer write-back and playback muxes.

74LS139×4

Dual 2-to-4 line decoder. Region decoding and the line-buffer strobes.

74LS153×3

Dual 4-to-1 multiplexer. The colour mixer's priority selection between sprite, character and background pixels.

74LS283×13

4-bit binary full adder. Adds the scroll offset to the raw counter on the C board, and the sprite Y offset on the B board.

PST518×1

Power-on reset generator. Holds the machine in reset until the supply is stable.

74LS194×10

H-IC001×6

'245×3

128/256×3

2.2K x 8×3

22K x8×3

'08×2

'194×2

'86×2

10D1×2

128×2

1K x8 resistor array×2

2SC2120×2

CXK5808P×2

edge connector (no designator printed)×2

unknown×2

'00×1

'139×1

'14×1

'157×1

'174×1

'32×1

'367×1

'74×1

(not printed - single-input gate, pins 9 in / 8 out; a bubble is drawn at BOTH the input and the output)×1

0 ohm link×1

10K x4 resistor array×1

12MHz crystal×1

1K×1

1K x 8 resistor array×1

2.2K x8 resistor arrays×1

256x4 PROM (no part number printed)×1

68B09×1

7400×1

74LS04 (no part number printed)×1

74LS04 (part number not printed on this sheet)×1

74LS21×1

74LS259×1

7611×1

CUSTOM (Capcom module, contains the Z80 sound CPU)×1

DIP SW (A) 8P×1

DIP SW (B) 8P×1

HA13001×1

HM6264F×1

RGP102 10K×1

RGP102 2K×1

TMM2018×1

TMM2108×1

jumpers×1