URTC-8 Universal RTC for Z80 computers - Revision history

Phi2x: /* Technical info */

2025-04-03T11:10:57Z

Technical info

← Older revision		Revision as of 11:10, 3 April 2025
Line 161:		Line 161:

	== Technical info ==		== Technical info ==
	~~This is the technical application manual for~~ the 72421 RTC ~~chip used in uRTC~~-8.		The uRTC-8 uses the Epson RTC-72421 chip: [[Media:Epson RTC-72421 datasheet.pdf\|Datasheet]] [[Media:Rtc72421 appman.pdf\|Application Manual]]


	[[~~File~~:Rtc72421 appman.pdf]]


	Of particular interest are the 16 registers:		Of particular interest are the 16 registers:
Line 186:		Line 182:
	rtcctrlE .db RTCBASE+0Eh ; control register E		rtcctrlE .db RTCBASE+0Eh ; control register E
	rtcctrlF .db RTCBASE+0Fh ; control register F		rtcctrlF .db RTCBASE+0Fh ; control register F


	== Prices ==		== Prices ==

JonB: /* Prices */

2020-12-02T08:56:21Z

Prices

← Older revision		Revision as of 08:56, 2 December 2020
Line 190:		Line 190:
	== Prices ==		== Prices ==
	This is a summary of the prices I have posted to the forum so far.		This is a summary of the prices I have posted to the forum so far.
	I am sorry that the assembled prices are what they are, but it is a time consuming and dreary job, not to mention the effort and cost to acquire the parts. Sadly the clock chip used in this design has become much more expensive (the last one I bought cost over £10) and there are many counterfeits coming out of China, so it is risky to buy ~~direct~~, so I have had to put the price of the uRTC up~~. Apologies~~.		I am sorry that the assembled prices are what they are, but it is a time consuming and dreary job, not to mention the effort and cost to acquire the parts.

			[Update Dec 2020] Sadly, the clock chip used in this design has become much more expensive (the last one I bought cost over £10) and there are many counterfeits coming out of China, so it is risky to buy cheaply from there. My last three orders of clock chips turned out to be fake parts - not one of them worked. So I have to buy from the expensive UK vintage chip suppliers. As a result, I have had to put the price of the uRTC up to compensate.

	{\| class="wikitable"		{\| class="wikitable"

JonB: /* Prices */

2020-12-02T08:53:23Z

Prices

← Older revision		Revision as of 08:53, 2 December 2020
Line 190:		Line 190:
	== Prices ==		== Prices ==
	This is a summary of the prices I have posted to the forum so far.		This is a summary of the prices I have posted to the forum so far.
	I am sorry that the assembled prices are what they are, but it is a time consuming and dreary job, not to mention the effort and cost to acquire the parts.		I am sorry that the assembled prices are what they are, but it is a time consuming and dreary job, not to mention the effort and cost to acquire the parts. Sadly the clock chip used in this design has become much more expensive (the last one I bought cost over £10) and there are many counterfeits coming out of China, so it is risky to buy direct, so I have had to put the price of the uRTC up. Apologies.

	{\| class="wikitable"		{\| class="wikitable"
Line 196:		Line 196:
	! Item !! Price		! Item !! Price
	\|-		\|-
	\| uRTC-8 assembled \|\| ~~£34~~.00		\| uRTC-8 assembled \|\| £44.00
	\|-		\|-
	\| Z80 Shim assembled (LHS or RHS) \|\| £17.50		\| Z80 Shim assembled (LHS or RHS) \|\| £17.50

JonB: /* Superbrain variant */

2019-10-10T11:42:26Z

Superbrain variant

← Older revision		Revision as of 11:42, 10 October 2019
Line 62:		Line 62:
	==== Superbrain variant ====		==== Superbrain variant ====

	~~Versdion~~ 0.2 https://drive.google.com/open?id=1UZq4VTQw32Y4G1tUflGlZpAKdPz19NY9		Version 0.2 https://drive.google.com/open?id=1UZq4VTQw32Y4G1tUflGlZpAKdPz19NY9

	==== Usage ====		==== Usage ====

JonB: /* CP/M Plus variant */

2019-10-10T11:42:08Z

CP/M Plus variant

← Older revision		Revision as of 11:42, 10 October 2019
Line 57:		Line 57:

	Version 0.1 https://drive.google.com/open?id=1Er7WKz09m9ctzeEk3jxSyDXjDc1OzInK		Version 0.1 https://drive.google.com/open?id=1Er7WKz09m9ctzeEk3jxSyDXjDc1OzInK

			Note: When you set the system time on the PCW (-t option), the second is always set to 0.

	==== Superbrain variant ====		==== Superbrain variant ====

JonB: /* uRTC.COM */

2019-10-10T11:40:14Z

uRTC.COM

← Older revision		Revision as of 11:40, 10 October 2019
Line 50:		Line 50:
	=== uRTC.COM ===		=== uRTC.COM ===

	==== ~~Download link~~ ====		Download the latest variant that matches your host computer, rename to uRTC.COM and transfer to your computer.

			==== CP/M Plus variant ====

	Version 0.2 https://drive.google.com/open?id=1biJngbF-HsDswufP4QZSDSKqk6e34a54		Version 0.2 https://drive.google.com/open?id=1biJngbF-HsDswufP4QZSDSKqk6e34a54

	Version 0.1 https://drive.google.com/open?id=1Er7WKz09m9ctzeEk3jxSyDXjDc1OzInK		Version 0.1 https://drive.google.com/open?id=1Er7WKz09m9ctzeEk3jxSyDXjDc1OzInK

			==== Superbrain variant ====

			Versdion 0.2 https://drive.google.com/open?id=1UZq4VTQw32Y4G1tUflGlZpAKdPz19NY9

	==== Usage ====		==== Usage ====
Line 61:		Line 67:
	usage: uRTC - show date and time from the RTC clock"		usage: uRTC - show date and time from the RTC clock"
	uRTC [[dd/mm/yy] [hh:mm[:ss]]] [-ts\|p] [-q] - set RTC day/date/time"		uRTC [[dd/mm/yy] [hh:mm[:ss]]] [-ts\|p] [-q] - set RTC day/date/time"
	-tp transfer uRTC date/time to ~~CP/M Plus system clock"~~		-t transfer uRTC date/time to host machine system clock"
	~~-ts transfer uRTC date/time to Superbrain~~ system clock"
	-q quiet mode, reports errors only"		-q quiet mode, reports errors only"

Line 78:		Line 83:
	A>uRTC		A>uRTC
	Tue 18 Dec 2018 17:05:13		Tue 18 Dec 2018 17:05:13
	A>uRTC -tp		A>uRTC -t
	CP/M Plus system time set: Tue 18 Dec 2018 17:05:13		CP/M Plus system time set: Tue 18 Dec 2018 17:05:13

	You can combine functions as well; so for example		You can combine functions as well; so for example

	A>uRTC 19/12/18 -tp		A>uRTC 19/12/18 -t

	..would set ~~the day of the week to Wednesday and~~ the date to the 19th Dec 2018 on uRTC's clock, then transfer the new date and current uRTC time to the host computer's system clock.		..would set the date to the 19th Dec 2018 on uRTC's clock, then transfer the new date and current uRTC time to the host computer's system clock.

	==== Y2K handling ====		==== Y2K handling ====
Line 95:		Line 100:

	==== Setting the system time automatically on the PCW ====		==== Setting the system time automatically on the PCW ====

			Use the CP/M Plus / PCW version of uRTC.COM.

	To automatically set the PCW system time, add the following line to the PROFILE.SUB file of the boot disk:		To automatically set the PCW system time, add the following line to the PROFILE.SUB file of the boot disk:

JonB: /* Setting the system time automatically on the Superbrain */

2019-10-10T11:34:10Z

Setting the system time automatically on the Superbrain

← Older revision		Revision as of 11:34, 10 October 2019
Line 102:		Line 102:

	==== Setting the system time automatically on the Superbrain ====		==== Setting the system time automatically on the Superbrain ====

			Use the Superbrain version of uRTC.COM.

	The Superbrain has no automatic boot command capability; however, if you are using uRTC-8 you can use the XSETCMD.COM program to set an initial boot command. The one you want is:		The Superbrain has no automatic boot command capability; however, if you are using uRTC-8 you can use the XSETCMD.COM program to set an initial boot command. The one you want is:

	uRTC -ts		uRTC -t

	If you are not using uIDE-8 on your Superbrain, you will have to remember to enter the command manually each time you boot. Advanced users may patch the CCP on the boot disk directly to inject the command.		If you are not using uIDE-8 on your Superbrain, you will have to remember to enter the command manually each time you boot. Advanced users may patch the CCP on the boot disk directly to inject the command.

JonB: /* Setting the system time automatically on the PCW */

2019-10-10T11:33:27Z

Setting the system time automatically on the PCW

← Older revision		Revision as of 11:33, 10 October 2019
Line 97:		Line 97:
	To automatically set the PCW system time, add the following line to the PROFILE.SUB file of the boot disk:		To automatically set the PCW system time, add the following line to the PROFILE.SUB file of the boot disk:

	uRTC -tp		uRTC -t

	Before first use, set the uRTC-8 clock time as shown in the usage section. Now, at each boot, the CP/M Plus system time is set automatically from the battery backed clock on the uRTC-8 board.		Before first use, set the uRTC-8 clock time as shown in the usage section. Now, at each boot, the CP/M Plus system time is set automatically from the battery backed clock on the uRTC-8 board.

JonB: /* Download link */

2019-10-10T11:32:39Z

Download link

← Older revision		Revision as of 11:32, 10 October 2019
Line 51:		Line 51:

	==== Download link ====		==== Download link ====
	https://drive.google.com/open?id=1Er7WKz09m9ctzeEk3jxSyDXjDc1OzInK
			Version 0.2 https://drive.google.com/open?id=1biJngbF-HsDswufP4QZSDSKqk6e34a54

			Version 0.1 https://drive.google.com/open?id=1Er7WKz09m9ctzeEk3jxSyDXjDc1OzInK

	==== Usage ====		==== Usage ====

JonB: /* Prices */

2019-10-09T15:20:44Z

Prices

← Older revision		Revision as of 15:20, 9 October 2019
Line 180:		Line 180:
	! Item !! Price		! Item !! Price
	\|-		\|-
	\| uRTC-8 assembled \|\| ~~£37~~.00		\| uRTC-8 assembled \|\| £34.00
	\|-		\|-
	\| Z80 Shim assembled (LHS or RHS) \|\| £17.50		\| Z80 Shim assembled (LHS or RHS) \|\| £17.50