Macintosh 512K - Revision history

Josh at 18:18, 4 September 2025

2025-09-04T18:18:38Z

← Older revision		Revision as of 19:18, 4 September 2025
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	! Range !! Size !! Purpose		! Range !! Size !! Purpose
	\|-		\|-
	\| $000000 – $07FFFF \|\| 512 KB \|\| DRAM (program, frame-buffer, stack, heap)		\| $000000 – $07FFFF \|\| 512 KB \|\| '''DRAM''' (program, frame-buffer, stack, heap)
	\|-		\|-
	\| $400000 – $41FFFF \|\| 128 KB \|\| ROM (Boot + Toolbox)		\| $400000 – $41FFFF \|\| 128 KB \|\| '''ROM''' (Boot + Toolbox)
	\|-		\|-
	\| $480000 – $4BFFFF \|\| 256 KB \|\| I/O space (VIA 1 & 2, SCC, IWM, VBL PAL)		\| $480000 – $4BFFFF \|\| 256 KB \|\| '''I/O space''' (VIA 1 & 2, SCC, IWM, VBL PAL)
	\|-		\|-
	\| $500000 – $5FFFFF \|\| 1 MB \|\| Reserved / not decoded		\| $500000 – $5FFFFF \|\| 1 MB \|\| '''Reserved / not decoded'''
	\|-		\|-
	\| $600000 – $FFFFFF \|\| Mirrors / “ghost ranges”		\| $600000 – $FFFFFF \|\| Mirrors / “ghost ranges”
	\|}		\|}

	Frame-buffer note: display memory occupies $07B000 – $07FFFF (22,016 bytes).		Frame-buffer note: display memory occupies '''$07B000 – $07FFFF''' (22,016 bytes).
	DMA steals cycles from the 68000 only during active scan-lines, identical to the 128 K.		DMA steals cycles from the 68000 only during active scan-lines, identical to the 128 K.

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	=== Hardware Easter Egg ===		=== Hardware Easter Egg ===
	Hold ⌘ + ⌥ + ⇧ + Clear at boot to hear the hidden “bass” startup chime.		Hold '''⌘ + ⌥ + ⇧ + Clear''' at boot to hear the hidden “bass” startup chime.
	(The 512K retains this ROM routine; it was removed in the 512Ke/Plus.)		(The 512K retains this ROM routine; it was removed in the 512Ke/Plus.)

Josh at 11:49, 23 April 2025

2025-04-23T11:49:45Z

← Older revision		Revision as of 12:49, 23 April 2025
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	=== System Architecture at a Glance ===		=== System Architecture at a Glance ===
	{\| class="wikitable styled-table" style="width:75%; text-align:center;"		{\| class="wikitable styled-table" style="width:70%; text-align:center;"
	! Sub-system !! Specification		! Sub-system !! Specification
	\|-		\|-

Josh: /* System Architecture at a Glance */

2025-04-23T11:49:23Z

System Architecture at a Glance

← Older revision		Revision as of 12:49, 23 April 2025
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	=== System Architecture at a Glance ===		=== System Architecture at a Glance ===
	{\| class="wikitable styled-table" style="width:80%; text-align:center;"		{\| class="wikitable styled-table" style="width:75%; text-align:center;"
	! Sub-system !! Specification		! Sub-system !! Specification
	\|-		\|-

Josh at 11:48, 23 April 2025

2025-04-23T11:48:52Z

@@ Line 25: / Line 25: @@
 == Maintenance ==
 Due to the 512K's similarities with the 128K, there is no difference in it's maintenance, PCB or Schmatics, please see the [[Macintosh 128K]] page for maintenance, guides and more information.
 [[Category:Apple Vintage Computers]]
 {{Navbox-AppleVintage}}

Josh at 21:00, 19 April 2025

2025-04-19T21:00:51Z

← Older revision		Revision as of 22:00, 19 April 2025
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	\| codename = Engine, Hero		\| codename = Engine, Hero
	\| model = M0001W		\| model = M0001W
	}}		}}The '''Macintosh 512K''', released on '''September 10, 1984''', was an improved version of the [[Macintosh 128K]]. It featured '''four times the RAM (512 KB)''', allowing for improved multitasking and compatibility with a wider range of software. It retained the same '''Motorola 68000 processor running at 7.83 MHz''' and the '''9-inch monochrome display''' with a '''400 KB floppy disk drive'''.
	The '''Macintosh 512K''', released on '''September 10, 1984''', was an improved version of the [[Macintosh 128K]]. It featured '''four times the RAM (512 KB)''', allowing for improved multitasking and compatibility with a wider range of software. It retained the same '''Motorola 68000 processor running at 7.83 MHz''' and the '''9-inch monochrome display''' with a '''400 KB floppy disk drive'''.

	Due to its increased memory, the Macintosh 512K could run more advanced applications, including '''MacDraw''', '''MacProject''', and '''Microsoft Multiplan'''. However, it still lacked built-in support for an internal hard drive, relying on external floppy drives for additional storage. The 512K model was succeeded by the [[Macintosh Plus]], which introduced '''expandable RAM and an external SCSI port'''.		Due to its increased memory, the Macintosh 512K could run more advanced applications, including '''MacDraw''', '''MacProject''', and '''Microsoft Multiplan'''. However, it still lacked built-in support for an internal hard drive, relying on external floppy drives for additional storage. The 512K model was succeeded by the [[Macintosh Plus]], which introduced '''expandable RAM and an external SCSI port'''.

Josh at 20:09, 19 April 2025

2025-04-19T20:09:48Z

← Older revision		Revision as of 21:09, 19 April 2025
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	{{Infobox computer		{{Infobox computer
	\| name = Macintosh 512K		\| name = Macintosh 512K
	\| image = [[File:Macintosh128K.jpg\|250px]]		\| image = [[File:Macintosh128K.jpg\|250px\|frameless]]
	\| manufacturer = Apple Computer, Inc.		\| manufacturer = Apple Computer, Inc.
	\| type = Personal ~~Computer~~		\| type = Personal computer
	\| ~~release date~~ = ~~September 10~~, ~~1984~~		\| release_date = September 10, 1984
	\| discontinued = ~~April 14~~, ~~1986~~		\| discontinued = April 14, 1986
	\| price = US$3,195		\| price = US$3,195
	\| cpu = ~~Motorola 68000~~ @ 7.~~83 MHz~~		\| cpu = Motorola 68000 @ 7.83 MHz
	\| memory = ~~512 KB RAM~~ (not expandable)		\| memory = 512 KB RAM (not expandable)
	\| storage = ~~400 KB 3~~.5" floppy drive		\| storage = 400 KB 3.5″ floppy drive
	\| display = 9" monochrome CRT (~~512×342 pixels~~)		\| display = 9″ monochrome CRT (512 × 342 px)
	\| sound = Monaural ~~8-bit~~, ~~22 kHz~~ (~~4-voice~~)		\| sound = Monaural 8‑bit, 22 kHz (4‑voice)
	\| dimensions = 13.~~6" H × 9~~.~~6" W × 10~~.~~9" D~~		\| dimensions = 13.6″ H × 9.6″ W × 10.9″ D
	\| weight = 16.~~5 lbs~~ (7.~~5 kg~~)		\| weight = 16.5 lb (7.5 kg)
	\| os = ~~System 1~~.~~0 – System 4~~.1		\| os = System 1.0 – System 4.1
	\| predecessor = [[~~Macintosh 128K~~]]		\| predecessor = [[Macintosh 128K]]
	\| successor = [[~~Macintosh 512Ke~~]]		\| successor = [[Macintosh 512Ke]]
	\| codename = Engine, ~~Hero~~		\| codename = Engine, Hero
	\| model = M0001W		\| model = M0001W
	}}		}}

Josh at 19:35, 19 April 2025

2025-04-19T19:35:13Z

← Older revision		Revision as of 20:35, 19 April 2025
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	\| os = System 1.0 – System 4.1		\| os = System 1.0 – System 4.1
	\| predecessor = [[Macintosh 128K]]		\| predecessor = [[Macintosh 128K]]
	\| successor = [[Macintosh ~~Plus~~]]		\| successor = [[Macintosh 512Ke]]
	\| codename = Engine, Hero		\| codename = Engine, Hero
	\| model = M0001W		\| model = M0001W

Josh at 15:24, 19 April 2025

2025-04-19T15:24:48Z

← Older revision		Revision as of 16:24, 19 April 2025
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	[[Category:Apple Vintage Computers]]		[[Category:Apple Vintage Computers]]

			{{Navbox-AppleVintage}}

Josh: /* Historical Background */

2025-04-05T11:09:35Z

Historical Background

← Older revision		Revision as of 12:09, 5 April 2025
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	\| model = M0001W		\| model = M0001W
	}}		}}
	~~== Historical Background ==~~
	The '''Macintosh 512K''', released on '''September 10, 1984''', was an improved version of the [[Macintosh 128K]]. It featured '''four times the RAM (512 KB)''', allowing for improved multitasking and compatibility with a wider range of software. It retained the same '''Motorola 68000 processor running at 7.83 MHz''' and the '''9-inch monochrome display''' with a '''400 KB floppy disk drive'''.		The '''Macintosh 512K''', released on '''September 10, 1984''', was an improved version of the [[Macintosh 128K]]. It featured '''four times the RAM (512 KB)''', allowing for improved multitasking and compatibility with a wider range of software. It retained the same '''Motorola 68000 processor running at 7.83 MHz''' and the '''9-inch monochrome display''' with a '''400 KB floppy disk drive'''.

Josh at 15:48, 15 March 2025

2025-03-15T15:48:38Z

← Older revision		Revision as of 16:48, 15 March 2025
Line 20:		Line 20:
	\| model = M0001W		\| model = M0001W
	}}		}}

	== Historical Background ==		== Historical Background ==
	The '''Macintosh 512K''', released on '''September 10, 1984''', was an improved version of the [[Macintosh 128K]]. It featured '''four times the RAM (512 KB)''', allowing for improved multitasking and compatibility with a wider range of software. It retained the same '''Motorola 68000 processor running at 7.83 MHz''' and the '''9-inch monochrome display''' with a '''400 KB floppy disk drive'''.		The '''Macintosh 512K''', released on '''September 10, 1984''', was an improved version of the [[Macintosh 128K]]. It featured '''four times the RAM (512 KB)''', allowing for improved multitasking and compatibility with a wider range of software. It retained the same '''Motorola 68000 processor running at 7.83 MHz''' and the '''9-inch monochrome display''' with a '''400 KB floppy disk drive'''.