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Internal AY

Timex Computer 2048 and AY-3-8910

Internal sound extension for TC2048 can be placed in a small space between speaker and heatsink. Heatsink should be shorted about 1.5 cm for this purpose. AY interface is built on universal board and connected to Z80CPU pins by the direct connections to DIL40 holder which is placed between the original CPU holder and the Z80CPU. This way of mounting still enables easy replacement of defected Z80's and easy dissasembling of the AY extension.

The design is based on 74LS138 address decoder and 74HC00 NAND gates used for RC generator. RC generator should generate about 1.7Mhz wave to get proper sound pitch (check output of 74HC00 pin 6). Additionally you can use two general purpose I/O 8-bit ports of AY-3-8910 for any purposes like parallel port for printer.

The AY sound module is glued down to the computers cover and separated by piece of isolating material.

Adam £oboda


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Files for download

ay_8910_schematic.png 227.4kB (2005-04-10 13:45)
Schematic, hand made version with list of parts.
ay_inside_t2048.jpg 45.5kB (2005-04-10 13:45)
The whole board of Timex Computer 2048 with AY sound interface attached.
ay_speaker.jpg 24.3kB (2005-04-10 13:45)
AY board between shortened heatsink and the speaker.
near_cpu.jpg 25.3kB (2005-04-10 13:45)
Mounting to the additional holder of the CPU Z80

See also

YAMOD.AYLPT
AY-3-8910 sound board (ZX Spectrum 128K and Timex 2068 compatibility) with printer slot and IIC magistral.

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© 2009-12-28 21:50 Jarek Adamski, http://8bit.yarek.pl