Atari 520ST - Revision history

Josh at 08:22, 13 August 2025

2025-08-13T08:22:39Z

← Older revision		Revision as of 09:22, 13 August 2025
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	== References ==		== References ==
	<references/>		<references/>
			[[Category:Atari Systems]]
	~~[[Category:Computers]]~~
	~~[[Category:Home computers]]~~
	[[Category:Atari ST]]

Josh: /* PCB Schematics & Service Guide */

2025-08-13T08:21:47Z

PCB Schematics & Service Guide

← Older revision		Revision as of 09:21, 13 August 2025
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	Service/schematic references		Service/schematic references
	* Early factory schematics: “Atari (Japan) Corporation” drawing C070112 (1985) covering 260/520ST main logic; scans circulate online.<ref>{{cite web \|url=https://archive.org/details/Atari_520ST_Schematic_1985 \|title=Atari 520ST Schematic (1985) \|publisher=Internet Archive \|access-date=2025-08-13}}</ref>		* Early factory schematics: “Atari (Japan) Corporation” drawing C070112 (1985) covering 260/520ST main logic; scans circulate online.<ref>{{cite web \|url=https://archive.org/details/Atari_520ST_Schematic_1985 \|title=Atari 520ST Schematic (1985) \|publisher=Internet Archive \|access-date=2025-08-13}}</ref>
	* 520/1040STE Field Service Manual (C302481‑001 Rev A, Aug 1991) includes many circuits compatible in concept (MFP, YM2149, DMA, WD1772) and is frequently referenced for troubleshooting I/O sections shared with ST family.<ref>{{cite web \|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html \|title=Atari STe 520/1040 Field Service Manual, C302481‑001 \|publisher=ManualsLib \|date=1991 \|access-date=2025-08-13}}</ref>		* [[Atari 520STE/1040STE Field Service Manual\|520/1040STE Field Service Manual]] (C302481‑001 Rev A, Aug 1991) includes many circuits compatible in concept (MFP, YM2149, DMA, WD1772) and is frequently referenced for troubleshooting I/O sections shared with ST family.<ref>{{cite web \|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html \|title=Atari STe 520/1040 Field Service Manual, C302481‑001 \|publisher=ManualsLib \|date=1991 \|access-date=2025-08-13}}</ref>

	== Technical Details ==		== Technical Details ==

Josh at 08:20, 13 August 2025

2025-08-13T08:20:37Z

← Older revision		Revision as of 09:20, 13 August 2025
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	\| weight = ≈4.3 kg (9 lb 7 oz)<ref>{{cite web \|url=https://myoldcomputers.com/museum/computers/atari_520st.htm \|title=Atari 520ST specifications (dimensions/weight) \|publisher=My Old Computers \|access-date=2025-08-13}}</ref>		\| weight = ≈4.3 kg (9 lb 7 oz)<ref>{{cite web \|url=https://myoldcomputers.com/museum/computers/atari_520st.htm \|title=Atari 520ST specifications (dimensions/weight) \|publisher=My Old Computers \|access-date=2025-08-13}}</ref>
	\| os = Atari TOS with Digital Research GEM; early units boot TOS from disk via small boot ROM, later 192 KB ROM‑TOS<ref>{{cite web \|url=https://mikrosk.github.io/doitarchive/doit_st/0f0601.htm \|title=TOS ROM sizes and configurations \|publisher=DOIT_ST archive \|access-date=2025-08-13}}</ref>		\| os = Atari TOS with Digital Research GEM; early units boot TOS from disk via small boot ROM, later 192 KB ROM‑TOS<ref>{{cite web \|url=https://mikrosk.github.io/doitarchive/doit_st/0f0601.htm \|title=TOS ROM sizes and configurations \|publisher=DOIT_ST archive \|access-date=2025-08-13}}</ref>
	\| predecessor = [[Atari ~~8-bit family~~]]		\| predecessor = [[Atari 65XE]]
	\| successor = [[Atari 1040STE]]		\| successor = [[Atari 1040STE]]
	}}		}}

Josh: /* Memory and Storage */

2025-08-13T08:20:07Z

Memory and Storage

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Josh: /* Logic Board & Analog Board Schematics */

2025-08-13T08:16:27Z

Logic Board & Analog Board Schematics

← Older revision		Revision as of 09:16, 13 August 2025
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	== PCB Schematics & Service Manual ==		== PCB Schematics & Service Manual ==
	See earlier “PCB Schematics & Service Guide” for board IDs. Early official drawing: C070112 (Atari Japan), and community KiCad reconstruction for C070231 are recommended for board‑level repair tracing.<ref>{{cite web \|url=https://archive.org/details/Atari_520ST_Schematic_1985 \|title=Atari 520ST Schematic (1985) \|publisher=Internet Archive \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://forums.atariage.com/topic/367081-conversion-of-the-schematics-of-the-atari-260520st-motherboard-into-kicad/ \|title=KiCad conversion for 260/520ST mainboard \|publisher=AtariAge \|date=2024-05-25 \|access-date=2025-08-13}}</ref>		See earlier “PCB Schematics & Service Guide” for board IDs. Early official drawing: C070112 (Atari Japan), and community KiCad reconstruction for C070231 are recommended for board‑level repair tracing.<ref>{{cite web \|url=https://archive.org/details/Atari_520ST_Schematic_1985 \|title=Atari 520ST Schematic (1985) \|publisher=Internet Archive \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://forums.atariage.com/topic/367081-conversion-of-the-schematics-of-the-atari-260520st-motherboard-into-kicad/ \|title=KiCad conversion for 260/520ST mainboard \|publisher=AtariAge \|date=2024-05-25 \|access-date=2025-08-13}}</ref>

	~~== Logic Board & Analog Board Schematics ==~~
	The 520ST uses a single logic board; there is no separate “analog board” as on compact Macs. Analog circuitry resides in external monitors (SC1224 color, SM124 mono). See monitor‑specific service docs for analog chassis; see this overview of SC1224 manufacturing variants (JVC/Goldstar/Samsung) for field notes.<ref>{{cite web \|url=https://mikrosk.github.io/doitarchive/doit_st/1205.htm \|title=SC1224 monitor notes (variants) \|publisher=DOIT_ST archive \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://caps.wiki/wiki/Atari_SC1224 \|title=Atari SC1224 (repair notes) \|publisher=Caps Wiki \|access-date=2025-08-13}}</ref>

	== Troubleshooting ==		== Troubleshooting ==

Josh: /* Apple Service Manual */

2025-08-13T08:16:08Z

Apple Service Manual

← Older revision		Revision as of 09:16, 13 August 2025
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	== PCB Schematics & Service Manual ==		== PCB Schematics & Service Manual ==
	See earlier “PCB Schematics & Service Guide” for board IDs. Early official drawing: C070112 (Atari Japan), and community KiCad reconstruction for C070231 are recommended for board‑level repair tracing.<ref>{{cite web \|url=https://archive.org/details/Atari_520ST_Schematic_1985 \|title=Atari 520ST Schematic (1985) \|publisher=Internet Archive \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://forums.atariage.com/topic/367081-conversion-of-the-schematics-of-the-atari-260520st-motherboard-into-kicad/ \|title=KiCad conversion for 260/520ST mainboard \|publisher=AtariAge \|date=2024-05-25 \|access-date=2025-08-13}}</ref>		See earlier “PCB Schematics & Service Guide” for board IDs. Early official drawing: C070112 (Atari Japan), and community KiCad reconstruction for C070231 are recommended for board‑level repair tracing.<ref>{{cite web \|url=https://archive.org/details/Atari_520ST_Schematic_1985 \|title=Atari 520ST Schematic (1985) \|publisher=Internet Archive \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://forums.atariage.com/topic/367081-conversion-of-the-schematics-of-the-atari-260520st-motherboard-into-kicad/ \|title=KiCad conversion for 260/520ST mainboard \|publisher=AtariAge \|date=2024-05-25 \|access-date=2025-08-13}}</ref>

	~~== Apple Service Manual ==~~
	Not applicable to the Atari 520ST. For ST service procedures, refer instead to the early 520ST schematic set (C070112) and the 520/1040STE Field Service Manual for comparable circuits and troubleshooting trees.<ref>{{cite web \|url=https://archive.org/details/Atari_520ST_Schematic_1985 \|title=Atari 520ST Schematic (1985) \|publisher=Internet Archive \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://www.manualslib.com/manual/2170364/Atari-520ste.html \|title=Atari STe 520/1040 Field Service Manual \|publisher=ManualsLib \|date=1991 \|access-date=2025-08-13}}</ref>

	== Logic Board & Analog Board Schematics ==		== Logic Board & Analog Board Schematics ==

Josh: /* Gallery */

2025-08-13T08:15:43Z

Gallery

← Older revision		Revision as of 09:15, 13 August 2025
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	* Joystick/mouse: two DE‑9 male (underside/front right). Port 0 is mouse/joystick; Port 1 joystick; +5 V on pin 7; ground on pin 8.<ref>{{cite web \|url=https://info-coach.fr/atari/hardware/interfaces.php \|title=Mouse/Joystick connectors \|publisher=info-coach.fr \|access-date=2025-08-13}}</ref>		* Joystick/mouse: two DE‑9 male (underside/front right). Port 0 is mouse/joystick; Port 1 joystick; +5 V on pin 7; ground on pin 8.<ref>{{cite web \|url=https://info-coach.fr/atari/hardware/interfaces.php \|title=Mouse/Joystick connectors \|publisher=info-coach.fr \|access-date=2025-08-13}}</ref>
	* Power (520ST/260ST external PSU): 7‑pin round DIN on computer: +5 V (multiple pins), +12 V, −12 V, grounds. Typical Atari spec: +5 V up to ~3 A, +12 V ~0.03–1 A (model‑dependent), −12 V ~0.03 A (used by RS‑232).<ref>{{cite web \|url=https://wiki.icomp.de/wiki/Powersupply_FAQ \|title=Power Supply FAQ – Atari 260/520ST 7‑pin DIN pinout (PS31/C070102‑3) \|publisher=Individual Computers Wiki \|access-date=2025-08-13}}</ref>		* Power (520ST/260ST external PSU): 7‑pin round DIN on computer: +5 V (multiple pins), +12 V, −12 V, grounds. Typical Atari spec: +5 V up to ~3 A, +12 V ~0.03–1 A (model‑dependent), −12 V ~0.03 A (used by RS‑232).<ref>{{cite web \|url=https://wiki.icomp.de/wiki/Powersupply_FAQ \|title=Power Supply FAQ – Atari 260/520ST 7‑pin DIN pinout (PS31/C070102‑3) \|publisher=Individual Computers Wiki \|access-date=2025-08-13}}</ref>

	~~== Gallery ==~~
	The original 520ST uses the “short‑case” shell (no internal drive/PSU) and shipped with an external SF354 3.5" drive and separate PSU brick. Regional color and badge variations exist; display was typically via SC1224 color or SM124 mono monitor.<ref>{{cite web \|url=https://www.atarimagazines.com/v4n4/interiors.php \|title=Interiors: Opening up the 520ST \|publisher=Antic \|date=1985-08 \|access-date=2025-08-13}}</ref>

	== Display and Graphics ==		== Display and Graphics ==

Josh: /* 🧠 Architecture and Processor */

2025-08-13T08:15:29Z

🧠 Architecture and Processor

← Older revision		Revision as of 09:15, 13 August 2025
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	* Floppy B: not seen: check DIN‑14 drive select wiring and STF strap default (Pin 5 often wired as Drive 1 select for external B:).<ref>{{cite web \|url=https://info-coach.fr/atari/hardware/interfaces.php \|title=Floppy connector and BLITZ cable notes \|publisher=info-coach.fr \|access-date=2025-08-13}}</ref>		* Floppy B: not seen: check DIN‑14 drive select wiring and STF strap default (Pin 5 often wired as Drive 1 select for external B:).<ref>{{cite web \|url=https://info-coach.fr/atari/hardware/interfaces.php \|title=Floppy connector and BLITZ cable notes \|publisher=info-coach.fr \|access-date=2025-08-13}}</ref>
	* ACSI devices: confirm straight‑through DB‑19M cable 1:1 to device and proper termination/ID; IRQ/REQ wiring faults present as timeouts.<ref>{{cite web \|url=https://info-coach.fr/atari/hardware/interfaces.php \|title=DMA/ACSI pinout and cabling \|publisher=info-coach.fr \|access-date=2025-08-13}}</ref>		* ACSI devices: confirm straight‑through DB‑19M cable 1:1 to device and proper termination/ID; IRQ/REQ wiring faults present as timeouts.<ref>{{cite web \|url=https://info-coach.fr/atari/hardware/interfaces.php \|title=DMA/ACSI pinout and cabling \|publisher=info-coach.fr \|access-date=2025-08-13}}</ref>

	~~== 🧠 Architecture and Processor ==~~
	~~Implementation notes for engineers:~~
	* The MFP’s Timer B is often used by TOS for display timing (HBLANK), Timer C drives the 200 Hz system clock; IKBD events arrive via the keyboard ACIA at 7812.5 baud (GLUE‑derived 500 kHz ÷64 for keyboard; MIDI ÷16).<ref>{{cite web \|url=https://www.bighole.nl/pub/mirror/homepage.ntlworld.com/kryten_droid/Atari/ST/spg/st_prog_guide_1.htm \|title=MFP timers and interrupts \|publisher=Concise ST Prog Ref \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://www.bighole.nl/pub/mirror/homepage.ntlworld.com/kryten_droid/Atari/ST/spg/st_prog_guide_2.htm \|title=Serial/MIDI/IKBD control \|publisher=Concise ST Prog Ref \|access-date=2025-08-13}}</ref>
	* Memory map summary for ROM and I/O: cartridge at $FA0000, TOS at $FC0000, PSG at $FF8800, DMA at $FF8600, ACIAs at $FFFC00/04, MFP at $FFFA00 region; align replacement ROMs accordingly (2‑chip vs 6‑chip variants).<ref>{{cite web \|url=https://temlib.org/AtariForumWiki/index.php/Atari_ST/STe/MSTe/TT/F030_Hardware_Register_Listing \|title=ST hardware register listing \|publisher=AtariForumWiki \|access-date=2025-08-13}}</ref><ref>{{cite web \|url=https://github.com/a2ff/splitrom \|title=TOS ROM splitter and motherboard notes \|publisher=GitHub (splitrom) \|access-date=2025-08-13}}</ref>

	== Technical Documentation ==		== Technical Documentation ==

Josh: Updated by RetroTechWikiBot - Generated page content

2025-08-13T08:14:57Z

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Josh: Updated by RetroTechWikiBot - Generated page content

2025-08-13T07:42:45Z

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