Atari 600XL
SALLY CPU and the MMU, BASIC and the XL OS built in, PBI on the back.
Open the Atari 600XL in Retro Bench- Also
- 600XL
- Year
- 1983
- CPU
- 6502C (SALLY) @ 1.79 MHz
- RAM
- 16 KB (two 16K x 4 DRAMs)
- ROM
- OS ROM 16 KB, BASIC Rev. B 8 KB (built in)
- Video
- ANTIC + GTIA
- Sound
- POKEY, 4 voices
- OS
- Atari OS XL
Chips
| Chip | Where | Role |
|---|---|---|
| SALLY 6502C (Atari XL/XE CPU, C014806) | U10 | CPU for the 600XL, 800XL and 130XE. HALT on pin 35, R/W moved to pin 36. |
| ANTIC CO12296 / C021697 display processor | U9 | Display list processor: fetches screen data by DMA, halts the CPU, makes the NMI for VBlank and DLI, refreshes DRAM. |
| CTIA C012295 / GTIA C014805 | Color, luminance and sync out, player/missile graphics, triggers and console keys; divides the color clock for ANTIC. | |
| POKEY C012294 | Four-voice sound, keyboard scan, eight pot (paddle) inputs and the SIO serial port. | |
| 6520 PIA | Keyboard, cassette 1, IEEE-488 data (PET) | |
| MMU C061618 (memory management PLA) | U2 | Address decoder: chip selects for GTIA, POKEY, PIA, OS ROM, BASIC, DRAM and cartridge. |
Ports and connectors
- SIO peripheral port (13-pin), 13-pin trapezoid, Atari proprietary
- Controller port 1 (DE-9), DE-9 male
- Controller port 2 (DE-9), DE-9 male
- Cartridge slot (30 contacts), Card edge 15/30, 0.1 in
- Parallel Bus Interface (PBI, 50-pin edge), Card edge, 25 + 25, 0.1 in
- Power in (+5 V DC), DIN-7 270° female
Power rails
| Rail | Expect | Measure at |
|---|---|---|
| +5 V | 4.9-5.1 V (±2 %) | atari-power pins 1, 4, 6 (power DIN); ANTIC pin 21; GTIA pin 27; POKEY pin 17 |
Symptoms
- Dead, black screen or random crashes after a power-up: check 4164, 6502C
- Red screen or memory test failures: check 4164
- Dead machine, black screen: check 6502C, ANTIC, GTIA, MMU
- No display, or blank or scrambled picture: check ANTIC, GTIA
- No color or wrong colors: check GTIA
- Dead keys: check POKEY
- No sound or SIO fails: check POKEY
- No joysticks, or no disk drive: check PIA
- No BASIC, or BASIC will not turn off: check MMU, PIA