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22![MrX Sound Board for the ZX81 from Sinclair “Manual for users and programmers” MrX Sound Board for the ZX81 from Sinclair “Manual for users and programmers”](https://www.pdfsearch.io/img/97dc8948cada4440b09b26c354f465a9.jpg) | Add to Reading ListSource URL: s504835350.online.deLanguage: English - Date: 2013-12-06 01:36:53
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23![UM–TH–91–18 June 9, 1993 UM–TH–91–18 June 9, 1993](https://www.pdfsearch.io/img/1da10b3be39033a01488ddd659059f6d.jpg) | Add to Reading ListSource URL: arxiv.orgLanguage: English - Date: 2008-01-31 20:53:21
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24![Turbo Sound (revision C) Sound expansion device for computers with Turbo Sound (revision C) Sound expansion device for computers with](https://www.pdfsearch.io/img/4edb24dd65d9c20712c5e8884e0e5e54.jpg) | Add to Reading ListSource URL: www.nedopc.comLanguage: English - Date: 2010-05-25 14:16:47
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25![MrX Sound Board for the ZX81 from Sinclair “Manual for users and programmers” MrX Sound Board for the ZX81 from Sinclair “Manual for users and programmers”](https://www.pdfsearch.io/img/01f43b62c5a5f4e0bcc8af10aa4b91e6.jpg) | Add to Reading ListSource URL: 8ung.atLanguage: English - Date: 2012-05-23 15:32:38
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26![](https://www.pdfsearch.io/img/3908c2770b47d34cd2dce8d6d8d6038f.jpg) | Add to Reading ListSource URL: users.rcn.comLanguage: English - Date: 2000-06-28 23:52:21
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27![](https://www.pdfsearch.io/img/8e40223d405d6cfec13ee61192c965bd.jpg) | Add to Reading ListSource URL: corphist.computerhistory.orgLanguage: English - Date: 2009-01-15 15:28:33
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