Yaze is a Z80 and CP/M emulator designed to run on Unix systems.
The package consists of:
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an instruction set simulator which accurately imitates a real Z80 microprocessor,
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a CP/M-2.2 bios written in C which runs on the Unix host but interacts with the simulated Z80,
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a monitor which loads CP/M into the simulated processor's ram and which makes Unix directories or files look like CP/M disks, and
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a separate program (cdm) which creates and manipulates CP/M disk images for use with yaze.
Yaze's "selling points", compared with previously available Z80 emulators, are:
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It emulates all documented and most undocumented processor-internal instructions and all flag bits (all 8, including the undocumented ones). A test program is included in the package which exhaustively (well, nearly exhaustively) compares all instructions, for all machine states before and after execution, against the results from a real chip.
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It is independent of the host machine architecture and instruction set. Written in ANSI standard C it is provided with full source code under the GNU General Public License.
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It supports all CP/M disk geometries in the form of images in Unix files or as read-only disks constructed on-the-fly from the contents of Unix directories. These disks are indistinguishable from real disks for even the most inquisitive, low-level CP/M programs. They can be mounted and unmounted at will during emulation.
Frank Cringle, October 1995 fdc@cliwe.ping.de
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