Difference between revisions of "Dobbertin Smart Watch"

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The [[Dobbertin Smart Watch]] was produced by [[Dobbertin]] Industrie Elektronik, a German company. This real time clock was relative wide spread in the 80ies and 90ies.
 
The [[Dobbertin Smart Watch]] was produced by [[Dobbertin]] Industrie Elektronik, a German company. This real time clock was relative wide spread in the 80ies and 90ies.
 +
 +
<br>
  
 
== Technicals ==
 
== Technicals ==
−
The Smart Watch consists out of the RTC itself and an EPROM expansion with a lot of RSX commends. The RTC itself was inserted like an EPROM in any kind of ROM or EPROM card. Further it contains a little battery. At least one clock is still running in 2010!
+
The SmartWatch consists out of the [[RTC]] itself and an EPROM expansion with a lot of RSX commands. The RTC itself was inserted like an EPROM in any kind of ROM or EPROM card. Further it contains a little battery. At least one clock is still running in 2014!
  
−
== Dallas Semiconductors Smart Watch ==
+
The Time-ROM can be on another ROM-select than the SmartWatch [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/real-time-clock-board/msg249697/#msg249697 Source].
 +
[[SymbOS]] is searching for the TIME.SET RSX command. It will then use this ROM [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/real-time-clock-board/msg249768/#msg249768 Source].
 +
 
 +
<br>
 +
 
 +
== Dallas Semiconductors SmartWatch ==
  
 
[[Image:DS1216E-Drawing.gif|right]]
 
[[Image:DS1216E-Drawing.gif|right]]
  
−
'''Forward: Whether or not the Dobbertin Smart Watch does actually contain chipset from Dallas Semiconductors is still unknown... The term "Smart Watch" and the technique of inserting the RTC into a ROM socket does indicate that the Dobbertin RTC has some relation to the Dallas product... It might be exactly that hardware, or similar compatible or incompatible hardware, or something entirely different... can somebody verify which chip(s) are used in the Dobbertin RTC ?'''
+
The 28pin '''SmartWatch''' (DS1216) is an adapter that can inserted in standard ROM sockets, a ROM chip can be mounted on the adapter, finally, inside of the adapter is a 16pin '''Phantom Time Chip''' (DS1315). Normal memory reads are forwarded to the piggyback ROM. After reading from a specific sequence of addresses, the ROM is disabled, and data is instead read from the Phantom Chip via 1bit databus. Writing to the Phantom Chip is done by '''reading''' from a specific sequence of addresses, too.
  
−
The 28pin '''Smart Watch''' (DS1216) is an adapter that can inserted in standard ROM sockets, a ROM chip can be mounted piggyback on the adapter, inside of the adapter is a 16pin '''Phantom Time Chip''' (DS1315). Normal memory reads are forwarded to the piggyback ROM. After reading from a specific sequence of addresses, the ROM is disabled, and data is instead read from the Phantom Chip via 1bit databus. Writing to the Phantom Chip is done by reading from a specific sequence of address, too.
+
<br>
  
−
* [[Media:DS1216-smart-watch.pdf]] - Datasheet for 28pin Dallas Smart Watch
+
=== 64bit packets ===
−
* [[Media:DS1315-phantom-time-chip.pdf]] - Datasheet for 16pin Dallas Phantom Time Chip
+
Accessing the RTC is done by following steps
−
* [[Media:DS1216-app-note-52.pdf]] - Application Note on Smart Watch and Phantom Time Chip
+
* Read 1 or more bits (this resets the recognition pattern; best read at least 64 bits, in case the chip was in the 64-bit data read phase)
 +
* Write the 8-byte (64bit) recognition pattern
 +
* Read or Write the 8-byte (64bit) register data
 +
The 8-byte (64bit) pattern/data is transferred serially, LSB first. The used bits on address and databus are:
 +
A2 data direction (0=write, 1=read)
 +
A0 data written to RTC, when A2=0=write
 +
D0 data read from RTC, when A2=1=read, and only when pattern recognized
 +
Note: Writes to the RTC chip are performed by using Z80 reads (PEEK) and the A2 and A0 address lines, with the SmartWatch mapped to memory and at addresses corresponding to where it is mapped.
  
−
== Downloads ==
+
<br>
  
−
* none such...? there should be drivers on cas, disc, or rom...?
+
=== Recognition Pattern ===
 +
The recognition pattern is: C5h, 3Ah, A3h, 5Ch, C5h, 3Ah, A3h, 5Ch.
 +
 
 +
The RTC chip requires 64 sequential writes with magic serial data on A0 to unlock it, immediately followed by 64 sequential reads to retrieve the 64-bit time data packet from D0, after which the chip locks itself back into ROM mode.
 +
 
 +
<br>
 +
 
 +
=== Real-Time Clock Registers ===
 +
 
 +
{| class="wikitable" style="text-align:center;"
 +
|-
 +
! rowspan="2" | Register !! colspan="8" | Bit Position !! rowspan="2" | Range (BCD)
 +
|-
 +
! 7 !! 6 !! 5 !! 4 !! 3 !! 2 !! 1 !! 0
 +
|-
 +
! 0
 +
| colspan="4" | 0.1 SEC || colspan="4" | 0.01 SEC || 00–99
 +
|-
 +
! 1
 +
| 0 || colspan="3" | 10 SEC || colspan="4" | SECONDS || 00–59
 +
|-
 +
! 2
 +
| 0 || colspan="3" | 10 MIN || colspan="4" | MINUTES || 00–59
 +
|-
 +
! rowspan="2" | 3
 +
| rowspan="2" | 12/24 || rowspan="2" | 0 || AM/PM || 10 HOUR || colspan="4" rowspan = "2" | HOUR || 01–12
 +
|-
 +
| colspan="2" | 10 HOUR || 00–23
 +
|-
 +
! 4
 +
| 0 || 0 || /OSC || /RST || 0 || colspan="3" | DAY || 01–07
 +
|-
 +
! 5
 +
| 0 || 0 || colspan="2" | 10 DATE || colspan="4" | DATE || 01–31
 +
|-
 +
! 6
 +
| 0 || 0 || 0 || 10 MONTH || colspan="4" | MONTH || 01–12
 +
|-
 +
! 7
 +
| colspan="4" | 10 YEAR || colspan="4" | YEAR || 00–99
 +
|}
 +
 
 +
Legend:
 +
* /OSC controls the oscillator. When set to "0", the oscillator turns on and the real time clock begins to increment
 +
* When the /RST bit is set to "0", a low input on the reset pin of the chip will cause the Time Chip to abort data transfer without changing data in the timekeeping registers
 +
 
 +
<br>
 +
 
 +
== Pictures ==
 +
The original RTC from Dobbertin:
 +
 
 +
[[File:DALLAS_DS1216.jpg]]
 +
 
 +
 
 +
The DXS RTC is a Dobbertin RTC clone [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/real-time-clock-board/msg249386/#msg249386 Source]:
 +
 
 +
[[File:RTCdxs.jpeg|500px]]
 +
 
 +
<br>
  
 
== Software ==
 
== Software ==
−
*The TimeROM+ Software provides RSX commands to use the RTC under BASIC.
+
*The TimeROM Software provides RSX commands to use the RTC under BASIC.
−
*Support for CP/M Plus was provided. The TIMEROM+.COM program sets the software clock according to the RTC.
+
*Support for CP/M Plus is provided. The TIMEROM+.COM program sets the software clock according to the RTC. Please use the patched versions of DATE.COM, DIR.COM, SETDEF.COM and SHOW.COM (Y2K Patch).
−
*The Smart Watch is also supported by [[FutureOS]].
+
*TFM's TIMEROM#.COM supports ROM slots 0-127 now.
 +
*[[TFM]] provided some routines [[Dobbertin Smart Watch:RTC routines|here]].
 +
*The Smart Watch is supported by [[FutureOS]], [[SymbOS]] and [[HDCPM]]. [https://www.cpcwiki.eu/forum/applications/hdcpm-boot-and-run-cpm-plus-from-hard-disk/msg249582/#msg249582 Source]
 +
*The Smart Watch is emulated in [[WinApe]] and [[MAME]].
 +
 
 +
The option to emulate the Dobbertin Smartwatch in WinAPE can be found in Settings/Other/Other devices:
 +
 
 +
[[File:WinAPE - Dobbertin SmartWatch.png]]
 +
 
 +
<br>
 +
 
 +
== Downloads ==
 +
* [[media:TIMEROM+.ROM|TIME ROM+]] ROM file
 +
* [[media:MF2_RRB.DSK|MF2_RRB.DSK]] - Vortex disc, containing the TimeRom+ CP/M driver
 +
* [[Media:DXS RTC - User Manual.pdf|DXS RTC User Manual]]
 +
 
 +
<br>
 +
 
 +
==Links==
 +
*[http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/dobbertin-smartwatch-help-needed-!/ CPCWiki Forum thread]
 +
* [[Media:DS1315-phantom-time-chip.pdf|Dallas DS1315 16pin Phantom Time Chip datasheet]]
 +
* [[Media:DS1216-smart-watch.pdf|Dallas DS1216 28pin Smart Watch datasheet]]
 +
* [[Media:DS1216-app-note-52.pdf|Dallas DS1216 Application Note]]
  
−
== Source Code ==
+
<br>
−
(Have to find out how to implement it here... please be patient)
+
  
−
[[Category:Hardware]][[Category:Peripherals]]
+
[[Category:FutureOS]]
 +
[[Category:Hardware]]
 +
[[Category:Peripherals]]

Latest revision as of 10:16, 9 April 2025

The Dobbertin Smart Watch was produced by Dobbertin Industrie Elektronik, a German company. This real time clock was relative wide spread in the 80ies and 90ies.


Technicals

The SmartWatch consists out of the RTC itself and an EPROM expansion with a lot of RSX commands. The RTC itself was inserted like an EPROM in any kind of ROM or EPROM card. Further it contains a little battery. At least one clock is still running in 2014!

The Time-ROM can be on another ROM-select than the SmartWatch Source. SymbOS is searching for the TIME.SET RSX command. It will then use this ROM Source.


Dallas Semiconductors SmartWatch

DS1216E-Drawing.gif

The 28pin SmartWatch (DS1216) is an adapter that can inserted in standard ROM sockets, a ROM chip can be mounted on the adapter, finally, inside of the adapter is a 16pin Phantom Time Chip (DS1315). Normal memory reads are forwarded to the piggyback ROM. After reading from a specific sequence of addresses, the ROM is disabled, and data is instead read from the Phantom Chip via 1bit databus. Writing to the Phantom Chip is done by reading from a specific sequence of addresses, too.


64bit packets

Accessing the RTC is done by following steps

  • Read 1 or more bits (this resets the recognition pattern; best read at least 64 bits, in case the chip was in the 64-bit data read phase)
  • Write the 8-byte (64bit) recognition pattern
  • Read or Write the 8-byte (64bit) register data

The 8-byte (64bit) pattern/data is transferred serially, LSB first. The used bits on address and databus are: 

A2 data direction (0=write, 1=read)
A0 data written to RTC, when A2=0=write
D0 data read from RTC, when A2=1=read, and only when pattern recognized

Note: Writes to the RTC chip are performed by using Z80 reads (PEEK) and the A2 and A0 address lines, with the SmartWatch mapped to memory and at addresses corresponding to where it is mapped.


Recognition Pattern

The recognition pattern is: C5h, 3Ah, A3h, 5Ch, C5h, 3Ah, A3h, 5Ch.

The RTC chip requires 64 sequential writes with magic serial data on A0 to unlock it, immediately followed by 64 sequential reads to retrieve the 64-bit time data packet from D0, after which the chip locks itself back into ROM mode.


Real-Time Clock Registers

Register Bit Position Range (BCD)
7 6 5 4 3 2 1 0
0 0.1 SEC 0.01 SEC 00–99
1 0 10 SEC SECONDS 00–59
2 0 10 MIN MINUTES 00–59
3 12/24 0 AM/PM 10 HOUR HOUR 01–12
10 HOUR 00–23
4 0 0 /OSC /RST 0 DAY 01–07
5 0 0 10 DATE DATE 01–31
6 0 0 0 10 MONTH MONTH 01–12
7 10 YEAR YEAR 00–99

Legend:

  • /OSC controls the oscillator. When set to "0", the oscillator turns on and the real time clock begins to increment
  • When the /RST bit is set to "0", a low input on the reset pin of the chip will cause the Time Chip to abort data transfer without changing data in the timekeeping registers


Pictures

The original RTC from Dobbertin:

DALLAS DS1216.jpg


The DXS RTC is a Dobbertin RTC clone Source:

RTCdxs.jpeg


Software

  • The TimeROM Software provides RSX commands to use the RTC under BASIC.
  • Support for CP/M Plus is provided. The TIMEROM+.COM program sets the software clock according to the RTC. Please use the patched versions of DATE.COM, DIR.COM, SETDEF.COM and SHOW.COM (Y2K Patch).
  • TFM's TIMEROM#.COM supports ROM slots 0-127 now.
  • TFM provided some routines here.
  • The Smart Watch is supported by FutureOS, SymbOS and HDCPM. Source
  • The Smart Watch is emulated in WinApe and MAME.

The option to emulate the Dobbertin Smartwatch in WinAPE can be found in Settings/Other/Other devices:

WinAPE - Dobbertin SmartWatch.png


Downloads


Links


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