URTC-8 Universal RTC for Z80 computers - Revision history

Phi2x: /* Technical info */

2025-04-03T11:10:57Z

‎Technical info

JonB: /* Prices */

2020-12-02T08:56:21Z

‎Prices

JonB: /* Prices */

2020-12-02T08:53:23Z

‎Prices

JonB: /* Superbrain variant */

2019-10-10T11:42:26Z

‎Superbrain variant

JonB: /* CP/M Plus variant */

2019-10-10T11:42:08Z

‎CP/M Plus variant

JonB: /* uRTC.COM */

2019-10-10T11:40:14Z

‎uRTC.COM

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

2019-10-10T11:34:10Z

‎Setting the system time automatically on the Superbrain

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

2019-10-10T11:33:27Z

‎Setting the system time automatically on the PCW

JonB: /* Download link */

2019-10-10T11:32:39Z

‎Download link

JonB: /* Prices */

2019-10-09T15:20:44Z

‎Prices

@@ Line 161: / Line 161: @@
 == 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:
@@ Line 186: / Line 182: @@
   rtcctrlE	.db	RTCBASE+0Eh	; control register E
   rtcctrlF	.db	RTCBASE+0Fh	; control register F
 == Prices ==

@@ Line 190: / Line 190: @@
 == Prices ==
 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.
 {| class="wikitable"

@@ Line 190: / Line 190: @@
 == Prices ==
 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"
@@ Line 196: / Line 196: @@
 ! Item !! Price
 |-
-| uRTC-8 assembled || £34.00
+| uRTC-8 assembled || £44.00
 |-
 | Z80 Shim assembled (LHS or RHS) || £17.50

@@ Line 62: / Line 62: @@
 ==== Superbrain variant ====
-Versdion 0.2 https://drive.google.com/open?id=1UZq4VTQw32Y4G1tUflGlZpAKdPz19NY9
+Version 0.2 https://drive.google.com/open?id=1UZq4VTQw32Y4G1tUflGlZpAKdPz19NY9
 ==== Usage ====

← 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 ====

@@ Line 50: / Line 50: @@
 === uRTC.COM ===
-==== Download link ====
+Download the latest variant that matches your host computer, rename to uRTC.COM and transfer to your computer.
 Version 0.2 https://drive.google.com/open?id=1biJngbF-HsDswufP4QZSDSKqk6e34a54
 Version 0.1 https://drive.google.com/open?id=1Er7WKz09m9ctzeEk3jxSyDXjDc1OzInK
 ==== Usage ====
@@ Line 61: / Line 67: @@
   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"
-  		-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"
@@ Line 78: / Line 83: @@
    A>uRTC
    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
 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 ====
@@ Line 95: / Line 100: @@
 ==== Setting the system time automatically on the PCW ====
 To automatically set the PCW system time, add the following line to the PROFILE.SUB file of the boot disk:

@@ Line 102: / Line 102: @@
 ==== Setting the system time automatically on the Superbrain ====
 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.