Editing Atari 1040STE (section)

== Input/Output and Expansion ==
All connectors (by physical type):
* Video: 13‑pin Atari DIN (RGB analog, mono, H/V sync, audio in/out, +12 V sense). Pinout widely documented for ST/STE.<ref>{{cite web |url=https://temlib.org/AtariForumWiki/index.php/Atari_ST_VGA_Cable_Procedures |title=Atari ST 13‑pin video pinout |publisher=AtariForumWiki |date=2006 |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://info-coach.fr/atari/hardware/interfaces.php |title=Atari ST Interfaces / Connectors / Cables |publisher=Info‑Coach.fr |access-date=2025-08-12}}</ref>
* Television RF (region dependent): present on NTSC “W/MOD” assemblies (onboard modulator).<ref>{{cite web |url=https://www.manualslib.com/manual/2170364/Atari-520ste.html?page=57 |title=Atari 520/1040STE Field Service Manual – Parts List |publisher=ManualsLib |access-date=2025-08-12}}</ref>
* Audio out: 2 × RCA (Left/Right) stereo line outputs (rear panel).<ref>{{cite web |url=https://info-coach.fr/atari/hardware/interfaces.php |title=Atari STE Stereo Audio Interface |publisher=Info‑Coach.fr |access-date=2025-08-12}}</ref>
* MIDI: 2 × 5‑pin DIN (MIDI IN/OUT), 31.25 kbit/s via 6850 ACIA.<ref>{{cite web |url=https://www.bighole.nl/pub/mirror/homepage.ntlworld.com/kryten_droid/Atari/ST/spg/st_prog_guide_1.htm |title=Concise Atari ST Programmer’s Guide – IKBD/MIDI |access-date=2025-08-12}}</ref>
* Serial (modem): DB‑25 male RS‑232C; printer: DB‑25 female Centronics‑compatible parallel.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Ports |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
* Joystick/mouse (legacy): 2 × DE‑9 male under keyboard (Port 0 mouse/joystick; Port 1 joystick). Pinout is standard Atari/Kempston.<ref>{{cite web |url=https://trumouse.com/atari-st-joystick-pinout/ |title=Atari ST 9‑pin joystick/mouse pinout |publisher=TruMouse |access-date=2025-08-12}}</ref>
* Enhanced joystick/analogue: 2 × DA‑15 (DB‑15F) “Enhanced Joystick Ports” (supporting extra buttons, paddles/light pen).<ref>{{cite web |url=https://allpinouts.org/pinouts/connectors/input_device/joystick-atari-enhanced-15-pin/ |title=Atari Enhanced 15‑pin joystick (STE/Falcon/Jaguar) pinout |publisher=AllPinouts |access-date=2025-08-12}}</ref><ref>{{cite web |url=https://info-coach.fr/atari/hardware/STE-HW.php |title=Atari STE Hardware – New Joysticks/Paddles/Pen |publisher=Info‑Coach.fr |date=2021-08-16 |access-date=2025-08-12}}</ref>
* External floppy: 14‑pin round DIN.<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Ports |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
* ACSI (DMA hard‑disk/laser printer): 19‑pin D‑sub (DB‑19).<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – Ports |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>
* Cartridge: 40‑contact card‑edge slot (128 KB ROMs typical).<ref>{{cite web |url=https://en.wikipedia.org/wiki/Atari_ST |title=Atari ST – ST cartridge port |publisher=Wikipedia |date=2025 |access-date=2025-08-12}}</ref>

I/O controller devices on the mainboard commonly include MC68901 MFP, MC6850 ACIAs (2×), RS‑232 line drivers/receivers (e.g., SN75188/SN75189 or MC1488/MC1489 on some revisions).<ref>{{cite web |url=https://mikrosk.github.io/doitarchive/doit_st/0303.htm |title=DOIT_ST: Parts |publisher=DOIT_ST |access-date=2025-08-12}}</ref>