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Re: Has anyone reverse engineered SP0256A external serial speech ROM [message #10773 is a reply to message #10771]

Fri, 17 May 2024 18:49

lynchaj
Messages: 1080
Registered: June 2016

Senior Member

Hi Bill,
Wow! Incredible progress!

How are you getting the SP0256 into T0 test mode? There are two ways described in the SP0256B datasheet. One is to set the Test pin high and put certain address pins low. Another way is to set Test pin high and pulse the reset pin. It's T0 mode we want since that disables the internal mask ROM.

Thanks! Andrew Lynch

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[Message index]

		Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Wed, 03 April 2024 08:38
		Can the SP-0256A Speech Processor be Reverse Engineered? By: jayindallas on Sat, 06 April 2024 09:26
		Reading G.I. SPRnnn External Serial ROM Content By: jayindallas on Mon, 08 April 2024 10:01
		Re: Method to read a SPR-xxx External Rom \| 2007 Internal Rom Dump \| 2017 SPPR256 by FPGA By: lynchaj on Mon, 08 April 2024 10:34
		Method to read a SPRnnn External Rom with an Arduino By: jayindallas on Mon, 08 April 2024 11:03
		Re: Theoretical Method to read a SPR-xxx External Rom with an Arduino By: lynchaj on Tue, 16 April 2024 11:23
		RPi Pico W wrapped around a SP0250 or SP0256 *Updated 20250202 By: jayindallas on Tue, 16 April 2024 18:27
		Re: RPi Pico W wrapped around a SP0250 or SP0256 By: lynchaj on Wed, 17 April 2024 04:10
		Arduino lab tool wrapped-around a SP0256 to reverse engineer an unobtainium SPR000 By: jayindallas on Wed, 01 May 2024 08:21
		Re: Arduino lab tool wrapped-around a SP0256 to reverse engineer an unobtainium SPR000 By: lynchaj on Wed, 01 May 2024 17:09
		Re: Arduino lab tool wrapped-around a SP0256 to reverse engineer an unobtainium SPR000 By: plasmo on Thu, 02 May 2024 20:45
		Re: Arduino lab tool wrapped-around a SP0256 to reverse engineer an unobtainium SPR000 By: lynchaj on Fri, 03 May 2024 04:17
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Sun, 12 May 2024 20:46
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Sun, 12 May 2024 20:51
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Mon, 13 May 2024 03:12
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Mon, 13 May 2024 06:08
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Mon, 13 May 2024 09:56
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Mon, 13 May 2024 20:10
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Tue, 14 May 2024 03:17
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Tue, 14 May 2024 20:07
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Wed, 15 May 2024 03:43
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Thu, 16 May 2024 07:57
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Fri, 17 May 2024 04:14
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Fri, 17 May 2024 05:29
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Fri, 17 May 2024 12:06
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Fri, 17 May 2024 18:49
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: plasmo on Fri, 17 May 2024 21:31
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Sat, 18 May 2024 03:27
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Sat, 18 May 2024 04:29
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: lynchaj on Sat, 18 May 2024 05:55
		Re: Has anyone reverse engineered SP0256A external serial speech ROM By: berzerkula on Tue, 16 July 2024 00:01

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