Editing Sega CD (Model 1) (section)

== Architecture overview ==
{| class="wikitable styled-table" style="width:70%; text-align:center;"
! Sub-system !! IC(s) !! Notes
|-
| Primary CPU || MC68EC000FN12 || 16-bit, no MMU, bus-master shares Genesis address lines
|-
| Scaling / Rotation || Sony CXD1161P + CXD1162P || 1024×1024 pixel source; affine transform to 320×224
|-
| PCM audio || Ricoh RF5C164 (QFP-80) || 8 voices, 10-bit DAC, 32 kHz max
|-
| CD controller || Hitachi HD641709 MCU (a 6301) + Sega CXD1800 drive DSP || Sub-CPU executes CD-DA and ISO9660 BIOS
|-
| Gate-array || Sega 315-5548 (ASIC) || Bus control, battery SRAM decode, host port, DMA to word-RAM
|-
| RAM || 2 × OKI M514256 (256 K×4) word-RAM<br />8 × HM514170 (64 K×4) program-RAM || Dual-port by ASIC
|-
| Optical deck || Sony PU-18 mech. w/ KSS-240A lens || 1 × CLV, spindle @ 530 rpm (innermost)
|}