Add S100 and DUO Platforms

Source/Doc/UserGuide.md

@@ -202,6 +202,8 @@ below, **carefully** pick the appropriate ROM image for your hardware.
 | [Z280 ZZRCC CPU Module]^7^                                     | RCBus   | RCZ280_zzrc.rom    | 115200        |
 | [Z280 ZZ80MB SBC]^7^                                           | RCBus   | RCZ280_zz80mb.rom  | 115200        |
 | [Z80-Retro SBC]^8^                                             | -       | Z80RETRO_std.rom   | 38400         |
+| [S100 Computers Z180]^9^                                       | S100    | S100_std.rom       | 38400         |
+| [Duodyne Z80 System]^1^                                        | Duo     | DUO_std.rom        | 38400         |
 
 | ^1^Designed by Andrew Lynch
 | ^2^Designed by Sergey Kiselev
@@ -211,6 +213,7 @@ below, **carefully** pick the appropriate ROM image for your hardware.
 | ^6^Designed by Steve Garcia
 | ^7^Designed by Bill Shen
 | ^8^Designed by Peter Wilson
+| ^9^Designed by John Monahan
 
 RCBus refers to Spencer Owen's RC2014 bus specification and derivatives
 including RC26, RC40, RC80, and BP80.
@@ -3927,6 +3930,52 @@ the RomWBW HBIOS configuration.
 
 `\clearpage`{=latex}
 
+### S100 Computers Z180
+
+|                   |               |
+|-------------------|---------------|
+| ROM Image File    | S100_std.rom  |
+| Console Baud Rate | 38400         |
+| Interrupts        | Mode 2        |
+
+ - CPU speed assumed to be 18.432 MHz
+ - System timer is generated by Z180 CPU
+ - Hardware auto-detected:
+   - Interrupt-driven RTC
+   - Z180 ASCI Serial Ports
+   - Onboard SD Card Interface
+
+`\clearpage`{=latex}
+
+### Duodyne Z80 System
+
+|                   |               |
+|-------------------|---------------|
+| ROM Image File    | DUO_std.rom   |
+| Console Baud Rate | 38400         |
+| Interrupts        | None          |
+
+ - CPU speed is detected at startup if DS1302 RTC is active
+   - Otherwise 8.000 MHz assumed
+ - System timer is generated by CTC if available
+ - Hardware auto-detected:
+   - DS1302 RTC
+   - Zilog CTC
+   - Zilog DMA Module
+   - UART Serial Adapter
+   - SIO Serial Interface
+   - LPT Printer Interface
+   - Zilog Parallel Interface
+   - CVDU Display Adapter
+   - TMS9938/58 Display Adapter
+   - PS/2 Keyboard Interface
+   - AY-3-8910/YM2149 Sound Module
+   - Floppy Disk Controller w/ 3.5" HD Drives
+   - PPIDE Hard Disk Interface
+ - Interrupts may be enabled in build options
+
+`\clearpage`{=latex}
+
 ## Appendix B - Device Summary
 
 The table below briefly describes each of the possible devices that