CS/A65 IEC

This board implements an IEEE488 interface, as well as a Commodore serial IEC bus interface, as used in the VIC20 and C64 (and others).

News:

2006-11-01 Board is deprecated. Use PETIO board instead.
2006-11-01 Added driver code.

Table of content

Driver

OS/A65 V2 IEEE488 driver

OS/A65 Beeper driver

Board Revisions

1.1B (ok)

Driver

OS/A65 V2 IEEE488 driver

This is the parallel IEEE488 and serial IEC driver code for the fsiec OS/A65 filesystem process. It implements the hardware access with the following methods:

IECINIT - Initialize the hardware

The following methods are used when the filesystem runs as a device (like CBM2031). This part is enclosed with the conditional variable NOLOOP. This part also handles a directory hierarchy with the CD command. This part is only available for the parallel IEEE488 interface, not the serial IEC bus.

RETLOOP - clear the bus
INLOOP - detect ATN activity and react as a device
talkloop - called from INLOOP to send data (TALK)
listenloop - called from INLOOP to receive data (LISTEN)
sendcmd - interpret the command channel
open - open a file

The following methods are used when the filesystem is running as bus master (similar to PET or C64). This part is enclosed with the preprocessor conditional variable NOFS.

iec0out - send a byte with ATN set
iecout - send a byte
sectalk - send a secondary talk
seclisten - send a secondary listen
IECIN - receive a byte
UNLISTEN - send unlisten
UNTALK - send untalk
getif - get interface using PSEM() and/or CTRLNMI()
freif - release interface using VSEM() and/or CTRLNMI()

Unfortunately, due to its age, the code is a mess, but works in GeckOS/A65.

	piec_csa_master.a65(parallel IEEE488 Driver code, excerpt to use as bus master)
	piec_csa_drive.a65(parallel IEEE488 Driver code, excerpt to use as IEEE488 drive)
	siec_csa.a65(serial IEC Driver code (bus master only))

OS/A65 Beeper driver

This driver handles the piezo beeper included in this board. It provides the three methods

inibell - initialize the bell
trigbell - trigger the bell sound
bellirq - interrupt code that modulates the bell ring until the ring is finished. Should be called with 50Hz or the count values must be modified.

	con_csa.a65(excerpt from console driver)
	via6522.i65(VIA register definitions)

Board revisions

Version: 1.1B

Status: ok

Notes

	This board is only partially compatible with the Commodore PET IEEE488 interface, although it uses the same I/O address. It adds, however, the ability to be used as a device (for both the IEEE488 and the IEC bus).
	This board is deprecated. Please use the PETIO board instead.

Files

	csaiecdesc.txt
	csaiecparts.txt
	csaiec.fig
	csaiec.png
	csaiec.ps.gz
	csaiec.jpg