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--- builderpages:mastmees:start [2025/11/17 03:45] – Revision from 2025-11-17
+++ builderpages:mastmees:start [2026/06/15 13:02] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:mastmees:start
+   Snapshot date: 2019-07-21
+   Generator    : wayback-archiver
+*/
+**Z-One**
+http://www.nomad.ee/micros/z-one/
+Z80 running at up to 4.6Mhz, changeable in MCU firmware
+Memory address space filled with 64K RAM
+CP/M running, with maxed out storage on SD card (16x8MB drives). You need at least 256MB card.
+ATMega1284P as system controller:
+Provides system clock for Z80
+Contains and serves bootloader, monitor, and CP/M binaries
+At startup, patches Z80 bootloader into first 128 bytes of RAM
+SD card interface and initialization
+Console port for Z80-ChibiTerm connection, using UART at 115200
+Heathkit H19 terminal emulation, with special keymappings for WordStar
+Software implemented auxiliary serial port connected to FTDI based USB-Serial converter, up to 19200
+Interval timer with 10ms resolution
+Integrated ChibiTerm
+×30 character text with analog VGA connector
+Inverse text and line drawing characters
+PS/2 keyboard, US layout only
+Boots into system monitor if no SD card, that has
+Commands to examine and change memory
+Built in Z80 disassembler
+SD card read/write sector commands
+Can read/write I/O ports
+Can run code, examine registers
+Download Intel Hex file from auxiliary port
+Wait logic for adding 2nd MCU
+Runs from 5V, with modern CMOS Z80 and HCT series logic chips uses less than 70mA
+{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:builderpages:mastmees:z-one.jpg]]
+**Z-Two**
+http://www.nomad.ee/micros/z-two/
+Like Z-One, but without physical Z80.
+ATMega1284P, running at 18.432MHz is the brains of the operation
+Emulates Z80
+All documented Z80 instruction set, at about 110000 instructions/sec at 18.482MHz ATMega clock
+Enough undocumented ones to pass all Frank Cringle's yaze tests
+Does not emulate undocumented flags 5 and 3
+No external interrupt capabilities
+Can physically address all 512K of memory, although currently only uses 64K for Z80 emulator
+Contains and provides boot loader, monitor, and CP/M binaries
+SD card interface and initialization
+Console port for Z80-ChibiTerm connection, using UART at 115200
+Heathkit H19 terminal emulation, with special key mappings for WordStar
+Auxiliary serial port connected to FTDI based USB-Serial converter
+SD card interface and initialization
+Provides interval timer with 10ms resolution
+CP/M 2.2 running, with maxed out storage on SD card (16x8MB drives). You need at least 256MB card.
+Integrated ChibiTerm
+The whole system runs from 3.3V, regulated down from 5V supply voltage. Uses less than 10mA
+{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:builderpages:mastmees:z-two.jpg]]