System | SNES-CD (Our Timeline) (Sony prototype, SFX-100) | SNES-CD (Our Timeline) (Rumored unreleased Philips model) | Philips CD-i | SNES-CD (Player Two Start Timeline) | SNES-CD (This Timeline) | Sega CD | PC Engine CD-ROM²/TurboGrafx-CD |
---|
Base Unit Main CPU Clock Speed | 3.58 MHz (Can clock down to 2.68 MHz or 1.79 MHz when accessing some slower peripherals.) | 3.58 MHz (Can clock down to 2.68 MHz or 1.79 MHz when accessing some slower peripherals.) | 15.5 MHz | 3.58 MHz (Can clock down to 2.68 MHz or 1.79 MHz when accessing some slower peripherals.) | 3.58 MHz (Can clock down to 2.68 MHz or 1.79 MHz when accessing some slower peripherals.) | 7.67 MHz | 7.16 MHz |
Base Unit Coprocessor Clock Speed | 2.048 MHz | 2.048 MHz | N/A | 2.048 MHz | 2.048 MHz | 4 MHz | N/A (None) |
Bus Width | 8 bits | 8 bits | Unknown | 8 bits | 8 bits | 16 bits | 8 bits |
Add-On Main CPU Clock Speed (Model, if Information Available, in Parentheses) | N/A (None) | 21.47727 MHz (NEC V810 32-bit RISC CPU) | N/A (None) | 21.47727 MHz (NEC V810 32-bit RISC CPU) | 21.47727 MHz (NEC V810 32-bit RISC CPU) (?) | 12.5 MHz | N/A (None) |
Add-On Coprocessor Clock Speed (Model, if Information Available, in Parentheses) | N/A | 4.29545 MHz (65C02; 'HANDS,' or the 'Hyper Advanced Nintendo Data Transfer System') | N/A | 4.29545 MHz (65C02; 'HANDS,' or the 'Hyper Advanced Nintendo Data Transfer System') | 4.29545 MHz (65C02; 'HANDS,' or the 'Hyper Advanced Nintendo Data Transfer System') | N/A | N/A |
Add-On Video | None | None | N/A (MPEG-1 and Video CD encode/decode available with 'Digital Video Card' expansion card) | None | ? | Custom ASIC | None |
Add-On Audio | CD | CD | N/A | CD | CD | ASIC + CD
(Ricoh + CD) | CD |
Add-On CD-ROM Drive Speed | 1× or 2× | 1× or 2× | 1× | 1× or 2× | 1× or 2× | 1× | 1× |
Base Unit Main RAM | 128 KiB | 128 KiB | 1 MiB | 128 KiB | 128 KiB | 64 KiB | 8 KiB |
Base Unit Video RAM | 64 KiB | 64 KiB | Unknown | 64 KiB | 64 KiB | 64 KiB | 64 KiB |
Base Unit Audio RAM | 64 KiB | 64 KiB | Unknown | 64 KiB | 64 KiB | 8 KiB | 0 KiB |
Total Base Unit RAM | 256 KiB | 256 KiB | Unknown | 256 KiB | 256 KiB | 136 KiB | 72 KiB |
Add-On Main Expansion RAM | 256 KiB | 512 KiB or 1,024 KiB (1 MiB) | N/A | 1 MiB (1,024 KiB) | 1 MiB (1,024 KiB) | 512 KiB | 64 KIB (256 KIB with Super CD, 2,048 KIB with Arcade Card) |
Add-On Expansion Supplemental RAM | None | 512 KiB (Exclusive/dedicated to HANDS and CD decoder) | None | 512 KiB (Exclusive/dedicated to HANDS and CD decoder) | 512 KiB (Exclusive/dedicated to HANDS and CD decoder) | None | None |
Add-On Expansion Video RAM | None | None | N/A | None | ? | 256 KiB | None |
Add-On Expansion Audio RAM | None | None | N/A | None | ? | 64 KiB | 64 KiB |
Add-on Expansion or Base Unit CD Cache RAM | 32 KiB | 128 KiB | Unknown | 128 KiB | 128 KiB | 16 KiB | 0 KiB |
Save Data Backup RAM | 8 KiB | 8 KiB | Unknown | 8 KiB | 8 KiB | 8 KiB | 0 KiB |
Total Add-On Expansion RAM | 296 KiB | 1,160 or 1,672 KiB | N/A | 1,672 KiB | | 856 KiB | 128 KiB (320 KiB with Super CD, 2,112 KiB with Arcade Card) |
All Base Unit and Add-On Expansion RAM Except Add-On Expansion Supplemental RAM | N/A | 904 or 1,416 KiB | N/A | 1,416 KiB | | N/A | N/A |
Total RAM (Base Unit + Add-On) | 552 KiB | 1,416 or 1,928 KiB | N/A | 1,928 KiB | ? | 992 KiB | 200 KIB (392 KIB with Super CD, 2,184 KiB with Arcade Card) |