### DESCRIPTION This is definitely the Z80-MBC (Multi Boot Computer), a mini 4MHz Z80 64kB RAM system with Basic and Forth interpreters, CP/M 2.2, QP/M 2.71, Assembler and C toolchains. It is a full advancement 'ecosystem', and using the iLoad boot mode it will be feasible cross-compile, insert and carry out on the target an Assembler or M program with a solitary command word (like in thé Arduino IDE).
Even more, it can become easily extended and it offers an 'Arduino center' making use of an Atmega32A as an 'general' I/O emulator. The PCB has been created by Expenses Westfield: ### Complex DETAILS / Elements The required ICs for the 'bottom system' are:.
Z .80 CPU CMOS (Z84C00) 4Mhz or greater. Atmega32A. TC551001-70 (128kN Memory). 74HChemical00 The MCU Atmega32A is certainly used as common I/U subsystem, as Eéprom, and as réset and 4MHz time clock generator for the Z80 CPU.
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Into the Atmega32A it can be flashed an Arduino bootloader used from, and it is certainly achievable to make use of the Panel Supervisor of the Arduinó IDE for thát. Flash the Arduinó bootloader at 1st (with the technique you prefer), next you can start to develop the entire factor! Of course I utilized the Arduino IDE to develop the IOS (l/O Subsytem) thát interacts with thé Z80 bus and ' virtualizes' the peripherals seen by the Z80 CPU. As oscillator it can be used the internal 8MHz Atmega32A oscillator, therefore no quartz is definitely required, and from this a single is made the 4MHz time clock for the Z80 CPU (so the 'Internal 8MHZ osc.' Bootloader variant must end up being chosen when blinking the bootloader fróm the Arduino lDE!).
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The 74HD00 is certainly mainly utilized as RS flipflop to prevent the Z80 CPU during I/O operation, giving the needed time to the Atmega32A to interact with the Z80 bus. The 128kN RAM TC551001 can be used just for half (64kM) because the Z80 address space is only 64kB (I've chosen this IC for the low cost). Note that just the CMOS edition of the Z80 CPU can be used here.
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This because just CMOS version, under provided condition that are usually recognized in this schematic, has logical amounts compatibles with Atméga32A and 74HD00. ### LEARN / Subject / Construct INSTRUCTIONS Almost all the detailed intructions and SW are usually in my page at.