[HP 71B] Software for FRAM71 users

[dayd]

(02-06-2017 10:11 PM)Dave Frederickson Wrote:  Hi André

(02-06-2017 09:26 PM)dayd Wrote:  According to the rules we talk about, HP-IL ROM is always in a 16k boundary which can be addresses X0000 to X7FFF or X8000 to XFFFF but because HP-IL is lower in port number it gets its address attributed before others 16k or less chips, at X0000 and if there isn’t another 16k or less ROM/IRAM the next 16k boundary at X8000 to XFFFF cannot be filled (the loss of address space can be lower if HP-IL address is at F0000).
As passionate as you are about it, you probably already figure that out by now.

Doesn't answer my question. This behavior is not limited to the HP-IL ROM. No matter what, ROM/IRAM configuration always starts on a 32k boundary.

Regards, Dave

This behavior is not limited to the HP-IL ROM: agreed.

Phase one of the distribution process;
RAM from bottom address 30000 to XX000
Phase two; ROM/IRAM 32k or more starting from the top addresses to bottom.
Phase Three; First 16k or less ROM/IRAM Starting (bottom to top) after the RAM but can be mixed with RAM in the same 32k boundary, so it takes the first available 16k boundary after that, which mathematically always will be at Y0000. If different than F0000, Y8000 is free for next 16k (or less) because phase two are 32k multiples.

regards, André