/Vintage/Sinclair/80/Peripherals/Bi-Pak ZON X-81 Sound Module/
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ZON X-81 by BI-PAK

The ZON X-81 is a programmable Sound Generator for use with ZX81. Later Bi-Pak released an adapter board to connect it to the ZX Spectrum and even later then a modified version called ZON X which connected to a ZX81 and a ZX Spectrum alike.

It contains an AY-3-8912 three-channel sound chip with amplifier, loudspeaker and volume control in a 6in. x 3in. x 2in. box. Everything was powered from the computer.

As the device is I/O-mapped it requires machine code on the ZX81 but their REM-located sample machine code is simple and relocatable and thus can coexist with other REM-based machine code.

BI-PAK ZON X-81 used the AY chip

"Make amazing sounds with your Spectrum." 8 octaves, 3 channels with full control over pitch, volume, tones and noise, all with envelope control. Usable in your own Basic or M/C programs. Because this devices used the A4 address space, it is not compatible with the Interface 1 and Micrdrive. Because this was originaly a ZX81 interface, a small additional board is required. It sits between the ZON X and the Speccy, and contains a 3.5 Mhz oscillator to stabilise the frequency. Sinclair User Dec 83/Apr 83.

Tech info

This info is derived from scrutinising a ZON X interface (for ZX81 and Specci) and may be wrong in some details. If you find an error, please be kind enough to report it.

Sound chip              AY-3-8192
Clock                   cpu clock at bus connector pin /Clk ÷ 2 
Decoded address lines:  A0=1 to A3=1, A4=0, A7 selects function
Used i/o address:       Select register:    0xCF    
                        Write register:     0x0F
                        Read register:      not possible.

Archive

	Name		Letzte Änderung		Länge
	Bi-Pak ZON X Sound Module/		2019-08-22 19:20		19
	Current Selling Prices/		2019-08-20 05:24		3
	XL/		2019-08-20 05:24		1
	ZON X-81 Manual (v.1) [Simon Holdsworth]/		2020-08-27 14:08		26
	ZON X-81 Manual (v.2) [Kio]/		2019-08-20 05:24		28
	Sinclair User 01300025 [WoS].jpg size: 969 × 1343		2006-02-15 12:37		249913
	ZON X-81 Manual (text) [Ian Priddey].pdf		2007-07-27 16:26		162828
	ZON X-81 Manual (v.1) [Simon Holdsworth].pdf		2015-05-17 17:02		4321369
	ZON X-81 Manual (v.2) [Kio].pdf		2015-05-17 18:29		2182532
	ZON X-81.jpg size: 600 × 450		2006-04-09 10:51		47339
	ZX Computing 821000035 [WoS].jpg size: 969 × 1315		2006-02-15 12:35		262789
	ZX Computing 830400030 [WoS].jpg size: 969 × 1269		2006-02-15 12:38		283325

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