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home
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describes the project scope and background
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release
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the current release and a set of useful hdos material available for free download
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current release
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hdos utilities
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support
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contact information, host requirements, product release notes and an overview of emulator limitations
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contacting the author
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macintosh host system requirements
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emulator limitations
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release notes
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design
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emulator design details
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system architecture
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an overview of the system architecture describing the three major control flows through the software modules
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instruction flow
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time distribution
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macintosh events
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performance
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describes
the variables that affect performance, the measurement of performance,
and analyzes the results of a number of benchmark tests
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performance variables
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methodology
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results
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time
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defines
'time' in the context of the emulator and describes how timing
information is generated and distributed through the emulator
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defining time
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time creation
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processor pacing
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time distribution
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h8 processing
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describes
how the 8080a "chip" is "glued" into the emulator architecture: how
memory is initialized, how interrupts are scheduled, and how processor
speed is managed
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processor initialization
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interrupt dispatch
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8080a emulation
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describes
the internal operation of the generic 8080a module, and details a few
of the more interesting topics: instruction dispatch, i/o interfacing,
memory write protection, registers and flags
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instruction dispatch
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in/out handling
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memory write protection
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register design
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flag handling
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i/o package
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describes
emulator i/o interfacing, both generically and with pam/8 specifics,
and details how the 8250 and 8251 chips are emulated
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ports
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8250 emulation
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8251 emulation
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pam/8 port handling
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pam/8 gui
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describes
the three main areas of the gui: keypad and keyboard event handling,
front-panel led drawing, and sound feedback generation
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keypad events
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led drawing
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sound
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h-17 disk system
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describes
both the physical and emulated h-17 disk systems in detail, with an
emphasis on the procedural aspects of the low-level disk driver's use
of the h-17 i/o ports to access the disk system
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h-17 physical disk format
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disk label format
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directory format
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date format
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i/o port operation
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emulator internal disk structure
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uninitialized disk handling
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h-17 driver notes
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preferences
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h-19 terminal
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discusses
the emulator's implementation of the h-19 terminal in detail, with an
emphasis on keyboard mapping, key translation, and output escape
sequence processing
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h-19 overview
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keyboard mapping
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h-19 graphics character generation
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character pacing
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output character processing
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cursor display
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serial i/o
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describes
three of the four serial applications: access to the macintosh printer,
file transfer to/from the macintosh, and access to the macintosh modem
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print page layout
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print handler design
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file transfer design
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modem design
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tape i/o
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describes the implementation and operation of pam/8 "cassette tape" load and dump
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tape file format
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tape implementation
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operating instructions
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resources
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provides
links to additional technical resources, other heathkit and h8 related
sites, and names the individuals who contributed greatly to the
successful implementation of the emulator
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technical reference material
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other heathkit links
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credits and contributions
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legal
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details my copyrights and the copyrights of other project contributors
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web site and emulator copyright
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pie text editor notices
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hug sy: driver notices
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heathkit software copyright status
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