HP-71B MultiMod ROM Emulator User Manual

[Sylvain Cote]

Hello Mark,

(01-20-2021 02:44 AM)mfleming Wrote:  Excellent summary! I should include something like this in the Appendix. Here are a couple of comments.

Thanks! (you can take mine if you want)

(01-20-2021 02:44 AM)mfleming Wrote:  

(01-20-2021 01:36 AM)Sylvain Cote Wrote:  

• ROM order follow chip number in the module (from 0 to 7)

The ROM order of enumeration follows the order of entries in the table. ...

Understood, I will update my summary to reflect this.

(01-20-2021 02:44 AM)mfleming Wrote:  

(01-20-2021 01:36 AM)Sylvain Cote Wrote:  

• Expected ROM size are: 16KB, 32KB or 64KB

This should really be expected chip size. If you build a ROM from a sequence of 16K chips then it can be any multiple of 16KB. You could build a 48KB ROM from three 16KB chips, or from one 32KB and one 16KB chip if you want!

I know, I will update my summary to show a ROM with multiple chips of 16K.

(01-20-2021 02:44 AM)mfleming Wrote:  

(01-20-2021 01:36 AM)Sylvain Cote Wrote:  

• ADDR : address of some sort, data is inconsistent, explanation not found in the manual

This is a lookup value used when mapping a 71B address to an address in flash memory. I used to do it by hand but realized it was a certain source of error if others had to do it. The value is now computed when the processor starts.

If it is calculated by your code, then I think you should just say to put 0x00 in that field, this will remove questions from a beginner.

(01-20-2021 02:44 AM)mfleming Wrote:  Edit: I should warn against changing the MMIO entry. You can probably guess why...

Mmmm, I wonder ... LOL

Question: for the place holder lines in the table, what should be put there to make it neutral, like default values for that type of line.

Sylvain