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prodos-drivers/clocks/cricket
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Joshua Bell f2ea11fcde Add "jumbo" clock driver, an amalgamation of the others 
This one driver pulls in the installers for each other clock driver,
and invokes each in turn:

* No-Slot Clock
* ROMX
* FujiNet
* DClock
* Cricket!

This requires adding `.ifndef JUMBO` guards in the other drivers for
when they pull in include files (symbols, macros, etc). The other
drivers are adjusted to return with carry clear on successful install,
failure otherwise.
2022-11-26 20:29:38 -08:00
..
cricket.system.s Add "jumbo" clock driver, an amalgamation of the others 2022-11-26 20:29:38 -08:00
Makefile Move clock driver sources into clocks/ subdir to tidy top level 2022-11-18 18:23:03 -08:00
prodos.mod.s Move clock driver sources into clocks/ subdir to tidy top level 2022-11-18 18:23:03 -08:00
README.md Move clock driver sources into clocks/ subdir to tidy top level 2022-11-18 18:23:03 -08:00
set.date.s Move clock driver sources into clocks/ subdir to tidy top level 2022-11-18 18:23:03 -08:00
set.time.s Move clock driver sources into clocks/ subdir to tidy top level 2022-11-18 18:23:03 -08:00
test.s Move clock driver sources into clocks/ subdir to tidy top level 2022-11-18 18:23:03 -08:00

README.md

The Cricket! — ProDOS Clock Driver

I acquired a Cricket sound/clock peripheral on eBay. Therefore it is now critical that we have a conforming ProDOS clock driver for it.

STATUS: Works on my machine!

Background

"The Cricket!" by Street Electronics Corporation, released in 1984, is a hardware peripheral for the Apple //c computer. It plugs into the serial port and offers a multi-voice sound synthesizer, a speech synthesizer, and a real-time clock.

The disks supplied with the device include:

  • /CRICKET/PRODOS.MOD which can be BRUN to patch ProDOS in memory with a clock driver.
  • A modified version of ProDOS
  • A utility to patch ProDOS on disk

CRICKET.SYSTEM

Like the NS.CLOCK.SYSTEM (by "CAP"), CRICKET.SYSTEM has these features:

  • A ProDOS .SYSTEM file
  • Detects the presence of a Cricket
  • Installs a driver in memory following the ProDOS clock driver protocol
  • Chains to the next .SYSTEM file (e.g. BASIC.SYSTEM)

Successfully tested on real hardware. (Laser 128EX, an Apple //c clone — including at 3x speed!)

Build

Requires cc65. The included Makefile is very specific to my machine - sorry about that.

CRICKET.SYSTEM is the result of the build.

Notes

I ended up disassembling both NS.CLOCK.SYSTEM (to understand the SYSTEM chaining - what a pain!) and The Cricket!'s PRODOS.MOD and melding them together, adding in the detection routine following the protocol in the manual.

Other Utilities

These BRUNable files are also built:

  • TEST attempts to identify an SSC in Slot 2 and the Cricket via the ID sequence, to test routines.
  • SET.DATE sets the Cricket's current date.
  • SET.TIME sets the Cricket's current time.

Resources

Cricket disks on Asimov:

  • ftp://ftp.apple.asimov.net/pub/apple_II/images/hardware/sound/cricket_disk1.po
  • ftp://ftp.apple.asimov.net/pub/apple_II/images/hardware/sound/cricket_disk2.po

Cricket Manual on Asimov:

  • ftp://ftp.apple.asimov.net/pub/apple_II/documentation/hardware/sound/Street%20Electronics%20The%20Cricket.pdf

FYI...

In the Cricket manual there is a short sample BASIC program to set the clock without the use of any assembly routines, using PR#2 to talk to the serial card followed by PRINT statements. This does not appear to work from ProDOS with the clock driver in place - the time ends up temporarily scrambled until the clock sorts itself out again. Assembly language routines do work, however. I believe ProDOS attempts to read the clock during the execution of the basic program, which interferes the device.