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 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, inputs:

• 12M: 12MHz clock, outputs next pixel on falling edge.
• C0~C31: C ROM data bus (2*16 bits). Gives all the pixel data needed for a 8 pixel line.
• H: When high, reverse bit order of pixels shifted out (used for sprites horizontal flipping)
• EVEN: Swap A/B pixels.
• LOAD: Latch C ROM data (on rising edge ?).

Outpus:

• DOTA: High when pixel A is opaque (color > 0)
• DOTB: High when pixel B is opaque (color > 0)
• GAD0~GAD3: Pixel A color data
• GBD0~GBD3: Pixel B color data