ACU Real Time Clock (DIY) - Revision history

Fgbrain: /* Article */

2012-04-07T00:11:09Z

Article

← Older revision		Revision as of 00:11, 7 April 2012
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	== Article ==		== Article ==

	<gallery caption="Part 1 - ACU April 1985">		<gallery caption="Part 1 - RTC DIY Hardware (ACU April 1985)">
	image:Amstrad Computer User8504 078.jpg		image:Amstrad Computer User8504 078.jpg
	image:Amstrad Computer User8504 079.jpg		image:Amstrad Computer User8504 079.jpg
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	Observe that the part number, MM58147, in the headline is wrong (it's meant to be MM58174).		Observe that the part number, MM58147, in the headline is wrong (it's meant to be MM58174).

	<gallery caption="Part 2 - ACU May 1985">		<gallery caption="Part 2 - Software for the RTC (ACU May 1985)">
	image:~~NoPicture~~.~~gif\|Part 2~~ - ~~not yet scanned (page 8 and up)~~		image:ACU8505-008.jpg
			image:ACU8505-014.jpg
			image:ACU8505-016.jpg
	</gallery>		</gallery>
	[[Category:Peripherals]] [[Category:DIY]]		[[Category:Peripherals]] [[Category:DIY]]

MacDeath at 16:56, 19 December 2010

2010-12-19T16:56:30Z

← Older revision		Revision as of 16:56, 19 December 2010
Line 53:		Line 53:
	image:NoPicture.gif\|Part 2 - not yet scanned (page 8 and up)		image:NoPicture.gif\|Part 2 - not yet scanned (page 8 and up)
	</gallery>		</gallery>
	~~[[Category:Hardware]]~~ [[Category:Peripherals]] [[Category:DIY]]		[[Category:Peripherals]] [[Category:DIY]]

Nocash: /* Article */

2010-08-26T20:27:00Z

Article

← Older revision		Revision as of 20:27, 26 August 2010
Line 41:		Line 41:
	== Article ==		== Article ==

	<gallery>		<gallery caption="Part 1 - ACU April 1985">
	image:Amstrad Computer User8504 078.jpg		image:Amstrad Computer User8504 078.jpg
	image:Amstrad Computer User8504 079.jpg		image:Amstrad Computer User8504 079.jpg
Line 50:		Line 50:
	Observe that the part number, MM58147, in the headline is wrong (it's meant to be MM58174).		Observe that the part number, MM58147, in the headline is wrong (it's meant to be MM58174).

			<gallery caption="Part 2 - ACU May 1985">
			image:NoPicture.gif\|Part 2 - not yet scanned (page 8 and up)
			</gallery>
	[[Category:Hardware]] [[Category:Peripherals]] [[Category:DIY]]		[[Category:Hardware]] [[Category:Peripherals]] [[Category:DIY]]

Nocash at 23:41, 11 August 2010

2010-08-11T23:41:38Z

← Older revision		Revision as of 23:41, 11 August 2010
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	ACU Real Time Clock, DIY from magazine "Amstrad User April 85".		ACU Real Time Clock, DIY from magazine [[Amstrad Computer User\|Amstrad User]], April 85.

	* The RTC chip doesn't include a Year register (aside from the leap-year shift register, but it can span only 4 years, and it is write-only).		* The RTC chip doesn't include a Year register (aside from the leap-year shift register, but it can span only 4 years, and it is write-only).

Nocash: /* Technical */

2010-01-10T22:26:40Z

Technical

← Older revision		Revision as of 22:26, 10 January 2010
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	== Technical ==		== Technical ==

	Uses a Z80 PIO, MM58174 RTC, 6116 (2K SRAM), 4040 (12bit counter for sequential SRAM addressing), and 32.768kHz Crystal (for the RTC). Both RTC and RAM are backed by rechargeable 3.6V NiCad battery. Used I/O Ports are (with only A10,A4,A3 decoded):		Uses a [[Z80 PIO]], MM58174 RTC, 6116 (2Kx8bit SRAM), 4040 (12bit counter for sequential SRAM addressing), and 32.768kHz Crystal (for the RTC). Both RTC and RAM are backed by rechargeable 3.6V NiCad battery. Used I/O Ports are (with only A10,A4,A3 decoded):
	FBE7h ACU Real Time Clock Z80-PIO Data In/Out Port A		FBE7h ACU Real Time Clock [[Z80 PIO]] Data In/Out Port A
	Bit7..4 SRAM Data7..4		Bit7..4 SRAM Data7..4
	Bit3..0 SRAM Data3..0 and 4bit RTC Data		Bit3..0 SRAM Data3..0 and 4bit RTC Data
	FBEFh ACU Real Time Clock Z80-PIO Data In/Out Port B		FBEFh ACU Real Time Clock [[Z80 PIO]] Data In/Out Port B
	Bit7 SRAM /CS and /OE (0=Select)		Bit7 SRAM /CS and /OE (0=Select)
	Bit6 RTC /CS (0=Select)		Bit6 RTC /CS (0=Select)
Line 18:		Line 18:
	Bit1 RTC Address A1		Bit1 RTC Address A1
	Bit0 RTC Address A0 and SRAM Address Counter /CLK (1-to-0=Increment)		Bit0 RTC Address A0 and SRAM Address Counter /CLK (1-to-0=Increment)
	FBF7h ACU Real Time Clock Z80-PIO Configure Port A		FBF7h ACU Real Time Clock [[Z80 PIO]] Configure Port A
	FBFFh ACU Real Time Clock Z80-PIO Configure Port B		FBFFh ACU Real Time Clock [[Z80 PIO]] Configure Port B
	The 4bit RTC Registers are:		The 4bit RTC Registers are:
	0 Not used / Test (W)		0 Not used / Test (W)

Nocash: /* Technical */

2010-01-10T14:36:53Z

Technical

← Older revision		Revision as of 14:36, 10 January 2010
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	C Month MSB (0..1) (R/W)		C Month MSB (0..1) (R/W)
	D Leap Year Shift Register (W)		D Leap Year Shift Register (W)
	E Stop/Start (W)		E Stop/Start (0=Stop and set Seconds to 00.0, 1=Start) (W)
	F Interrupt (R/W)		F Interrupt (R/W)
	Registers 1..C are BCD (range 0..9), a value of 0Fh in these registers indicates Failure (this may happen if the time changed while reading - if that happens, restart reading ALL time registers).		Registers 1..C are BCD (range 0..9), a value of 0Fh in these registers indicates Failure (this may happen if the time changed while reading - if that happens, restart reading ALL time registers).

Nocash: /* Technical */

2010-01-10T14:31:38Z

Technical

← Older revision		Revision as of 14:31, 10 January 2010
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	E Stop/Start (W)		E Stop/Start (W)
	F Interrupt (R/W)		F Interrupt (R/W)
	Registers 1..C are BCD (range 0..9), a value of 0Fh in these registers indicates Failure.		Registers 1..C are BCD (range 0..9), a value of 0Fh in these registers indicates Failure (this may happen if the time changed while reading - if that happens, restart reading ALL time registers).

	== Article ==		== Article ==

Nocash: /* Technical */

2010-01-10T14:26:18Z

Technical

← Older revision		Revision as of 14:26, 10 January 2010
Line 5:		Line 5:
	== Technical ==		== Technical ==

	Uses a Z80 PIO, MM58174 RTC, 6116 (2K ~~RAM~~), 32.768kHz Crystal. Both RTC and RAM are backed by rechargeable 3.6V NiCad battery. Used I/O Ports are (with only A10,A4,A3 decoded):		Uses a Z80 PIO, MM58174 RTC, 6116 (2K SRAM), 4040 (12bit counter for sequential SRAM addressing), and 32.768kHz Crystal (for the RTC). Both RTC and RAM are backed by rechargeable 3.6V NiCad battery. Used I/O Ports are (with only A10,A4,A3 decoded):
	FBE7h ACU Real Time Clock Z80-PIO Data In/Out Port A		FBE7h ACU Real Time Clock Z80-PIO Data In/Out Port A
			Bit7..4 SRAM Data7..4
			Bit3..0 SRAM Data3..0 and 4bit RTC Data
	FBEFh ACU Real Time Clock Z80-PIO Data In/Out Port B		FBEFh ACU Real Time Clock Z80-PIO Data In/Out Port B
			Bit7 SRAM /CS and /OE (0=Select)
			Bit6 RTC /CS (0=Select)
			Bit5 RTC /RD (0=Read)
			Bit4 RTC /WR (0=Write)
			Bit3 RTC Address A3 and SRAM /WE (0=Write)
			Bit2 RTC Address A2 and SRAM Address Counter RST (1=Reset, 0=Active)
			Bit1 RTC Address A1
			Bit0 RTC Address A0 and SRAM Address Counter /CLK (1-to-0=Increment)
	FBF7h ACU Real Time Clock Z80-PIO Configure Port A		FBF7h ACU Real Time Clock Z80-PIO Configure Port A
	FBFFh ACU Real Time Clock Z80-PIO Configure Port B		FBFFh ACU Real Time Clock Z80-PIO Configure Port B

Nocash: /* Technical */

2010-01-09T22:05:41Z

Technical

← Older revision		Revision as of 22:05, 9 January 2010
Line 9:		Line 9:
	FBEFh ACU Real Time Clock Z80-PIO Data In/Out Port B		FBEFh ACU Real Time Clock Z80-PIO Data In/Out Port B
	FBF7h ACU Real Time Clock Z80-PIO Configure Port A		FBF7h ACU Real Time Clock Z80-PIO Configure Port A
	FBFFh ACU Real Time Clock Z80-PIO Configure Port A		FBFFh ACU Real Time Clock Z80-PIO Configure Port B
	The 4bit RTC Registers are:		The 4bit RTC Registers are:
	0 Not used / Test (W)		0 Not used / Test (W)

Nocash: /* Technical */

2010-01-09T21:58:03Z

Technical

← Older revision		Revision as of 21:58, 9 January 2010
Line 6:		Line 6:

	Uses a Z80 PIO, MM58174 RTC, 6116 (2K RAM), 32.768kHz Crystal. Both RTC and RAM are backed by rechargeable 3.6V NiCad battery. Used I/O Ports are (with only A10,A4,A3 decoded):		Uses a Z80 PIO, MM58174 RTC, 6116 (2K RAM), 32.768kHz Crystal. Both RTC and RAM are backed by rechargeable 3.6V NiCad battery. Used I/O Ports are (with only A10,A4,A3 decoded):
	~~FBE7~~ Z80 PIO Data In/Out Port A		FBE7h ACU Real Time Clock Z80-PIO Data In/Out Port A
	~~FBEF~~ Z80 PIO Data In/Out Port B		FBEFh ACU Real Time Clock Z80-PIO Data In/Out Port B
	~~FBF7~~ Z80 PIO Configure Port A		FBF7h ACU Real Time Clock Z80-PIO Configure Port A
	~~FBFF~~ Z80 PIO Configure Port A		FBFFh ACU Real Time Clock Z80-PIO Configure Port A
	The 4bit RTC Registers are:		The 4bit RTC Registers are:
	0 Not used / Test (W)		0 Not used / Test (W)