|Re: Two questions (Re: HP-41 Memory chips info (for those HW guys out there :-))|
Message #4 Posted by Diego Diaz on 24 Mar 2012, 8:06 p.m.,
in response to message #3 by Luiz C. Vieira (Brazil)
I'm very happy to have saved some of your time and effort.
To your first question, I have never tried. However just a couple of considerations.
As you probably know, D/S registers "RAM" are not "memory" but a "peripheral" from NUT processor point of view. See this previous thread for details.
So when it comes to handle such peripheral, the Module in charge must not only deal with the typical ROM functions (i.e. be "readable") but also handle and execute a bunch of commands itself (I know quite well since I have to build the decoder for these instructions when developing the double X-Memory emulation for NoV-64 and Clonix-D).
In short, if the instruction handling is implemented into the D/S chip (this will be my guess), it should work with any ROM emulation device (Clonix, MLDL, NoV's, etc). Otherwise it won't work.
However, these chips are (AFAIK) only mounted into CX's so the X-Functions ROM should be there. Shouldn't they?
Anyhow, please share the result of your experiments.
To the second point, I agree. I have only found LH701-5 into CX, however, they could also be used to replace defective D/S chips in a CV. There shouldn't be any functional difference between both kind of chips.
Cheers from Caribean Sea.
Edited: 24 Mar 2012, 8:43 p.m.