The 800 successor: SALLY, the MMU and 64 KB, with the OS and BASIC built in.
| Chip | Where | Role |
|---|
| SALLY 6502C (Atari XL/XE CPU, C014806) | U8 | CPU for the 600XL, 800XL and 130XE. HALT on pin 35, R/W moved to pin 36. |
| ANTIC CO12296 / C021697 display processor | U7 | Display list processor: fetches screen data by DMA, halts the CPU, makes the NMI for VBlank and DLI, refreshes DRAM. |
| CTIA C012295 / GTIA C014805 | U17 | Color, luminance and sync out, player/missile graphics, triggers and console keys; divides the color clock for ANTIC. |
| POKEY C012294 | U22 | Four-voice sound, keyboard scan, eight pot (paddle) inputs and the SIO serial port. |
| 6520 PIA | U23 | Keyboard, cassette 1, IEEE-488 data (PET) |
| MMU C061618 (memory management PLA) | U3 | Address decoder: chip selects for GTIA, POKEY, PIA, OS ROM, BASIC, DRAM and cartridge. |
| FREDDIE C061991 (XE DRAM address controller) | | DRAM address multiplexer on the 130XE. |
| 4164 DRAM 64K×1 | U9-U16 | Main RAM (8 chips = 64 KB) |
| 27128-pinout 16K x 8 ROM | U5, OS ROM 16K x 8 (C061598-29 on the photographed board). The FSM schematic draws a 27128 with pins 1 (VPP) and 27 (PGM) at +5 V. | 16K x 8 ROM or EPROM in the JEDEC 27128 pinout. |
| 2364 Mask ROM 8K×8 | U4, BASIC ROM 8K x 8 (C024947A-01 on the photographed board) | BASIC and KERNAL ROMs (C64); BASIC and KERNAL (VIC-20, PET); character ROM (C128) |