Michel Adam wrote: Yep, I agree, that?s how I remember it happening, and in fact we have evidence of this in our possession. The Access Internals documentation 22687-90020 on page 4-39 has a snip of source code for the power fail routines and the very first comment references TSB/G. As for a company (as I recall from Canada) supporting a version called TSB-G, I think this was also the case. I want to say that their version also supported accounts that started with an at sign (ie @000-@999). After the 2000 line was ended the source was made available to existing customers and VARs for the price of $500, as I recall. Not many took advantage of the opportunity, but HP would allow a VAR to put systems together and sell them with the TSB software. I may even have a notice here in an HP users group publication about this. Access and I assume System were the only versions that required IOP micro-code. And the descriptions of the micro-coded instructions are in the above-mentioned document along with the rational for this enhancement. Now a big ?HIP HIP HORAYYYYY? so glad that last version of the micro-code has been found! That is fantastic news! And by the way, the next version of SIMH should run Access without tweaking, at least under windows. ZIPs are still available for people wanting to play with a pre-release package. (Yes Jay, still waiting for you to put up an Access system on classicmp, it runs under SIMH.) FWIW Mike Gemeny