NEO-ZMC2

NEO-ZMC2 chip found on a 1FZS MVS board.

NEO-ZMC and PRO-CT0 in one package. The PRO-CT0 is a network of shift registers and multiplexers (32-bit C ROM bus to two 4 bpp pixel outputs).

Found in second revision MVS boards (for the PRO-CT0 logic only) and AES carts.

Pinout

File:Neo-zmc2 pinout.png

OpenOffice Draw file: File:Neo-zmc2.odg

NEO-ZMC part:

• A0,A1,A8~A15: Z80 address bus
• MA11~M21: M ROM address outputs (NEO-ZMC part)

"SORD0" = SDRD0

PRO-CT0 part:

• 12M: Input, 12MHz clock, outputs next pixel on falling edge
• GAD0~GAD3: Outputs, pixel A color data
• GBD0~GBD3: Outputs, pixel B color data
• LOAD: Input, latch C ROM data (on rising edge ?)
• C0~C31: Inputs, C ROM data bus (2*16 bits). Gives all the pixel data needed for a 8 pixel line.
• H: Input, when high, reverse bit order of pixels (used for sprites horizontal flipping)
• DOTA: Output, high when pixel A is opaque
• DOTB: Output, high when pixel B is opaque