CDROM-2 board

Particularities

 * No memory card slot, replaced with some battery-backed RAM
 * DMA capable
 * CD Audio tracks playback

CDM4-2 board:

"VRAM bank 1" is palette ram ?

NEO-BUF, NEO-SFT, NEO-OFC, NEO-GRZ, 68k CPU, 68k RAM, Battery-backed RAM, Palette RAM, Z80 CPU, NEO-YSA, DRAM, VRAM, LC98000, LC89515, NEO-MGA, Clock, BIOS, PSRAM, LO ROM