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prodos-drivers/clocks/cricket
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frankmilliron b182a53dfa
The Cricket!: fix hang on Total Replay (#19) 
* The Cricket!: fix hang on Total Replay

The Cricket reset command sends Total Replay into an endless loop when launched, presumably because of an interrupt situation (TR just does RTI on an interrupt). Toggling the COMMAND and CONTROL settings seems to allow TR to function properly, while also allowing the Cricket initialization code to silence any playing notes.

* The Cricket!: Reset Cricket before probing

Finds the Cricket every single time this way. Occasionally the driver would miss finding it due to it being in a wait state. Sending a reset first fixes that.

* The Cricket!: make sure registers are toggled for TR
2023-07-17 08:11:30 -07:00
..
cricket.system.s The Cricket!: fix hang on Total Replay (#19) 2023-07-17 08:11:30 -07:00
Makefile The Cricket!: Add unified SET.DATETIME util 2023-06-25 11:46:35 -07:00
prodos.mod.s Move clock driver sources into clocks/ subdir to tidy top level 2022-11-18 18:23:03 -08:00
README.md The Cricket!: Add unified SET.DATETIME util 2023-06-25 11:46:35 -07:00
set.date.s The Cricket!: Reset SSC ACIA before probing/setting 2023-06-25 12:06:40 -07:00
set.datetime.s The Cricket!: Reset SSC ACIA before probing/setting 2023-06-25 12:06:40 -07:00
set.time.s The Cricket!: Reset SSC ACIA before probing/setting 2023-06-25 12:06:40 -07:00
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.DATETIME sets the Cricket's current date and time.
  • 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.