For your question on how big the gap is (that is "wasted"), from my earlier post:
In this case ZoRAM is configured to use 256MB, so the start address of its memory use would be a multiple of 256MB. Using broad numbers as an example, say the next available Z3 address space was 1.1GB - the ZorRAM memory would start at 1.25GB thereby wasting the memory between 1.1-1.25GB so that it could start at the next .25GB (256MB) multiple. I am not aware that this unused memory is actually used for anything.Calgor wrote:Is anyone from Hyperion able to shed any light on my 3 questions?
I may have found the answer to number 3 from the RKRM Hardware Manual (1989) in the Section on AutoConfig:
"The AUTOCONFIG spec requires that boards be configured on boundaries that match their space requirements."
It then goes on to list examples for 1MB boards and 4MB boards in Zorro 2.
But this is for Zorro 2. The later OS2.x RKRM I could not find any mention of this for Zorro 3 or even Zorro 2.
And it also does not say whether it is the OS (i.e. expansion.library) or the card that can determine this.
Taking the Radeon card out of your setup will not make any more address space for Zorro3 available fo your PicassoIV unless you also reduce the address space use of the Mediator to change it from 512MB to 256MB window. I expect it would work if you did change the jumper, and you can confirm any address space problems by running the showconfig command as earlier in this thread. As you said, it is not related to OS4.1 - the system not being able to boot is due to Kickstart 3.1 and its autoconfig which is utilised earlier. What OS4.1 does force you to have is the 512MB mediator window for the 256MB radeon.
If ZorRAM is shown as being defective, it could be there is not enough autoconfig space, or you have an old ZorRAM and an old Buster rev (AmigaKit should be able to confim this for your ZorRAM, I cannot remember the scenarios).
Suggestion: If you can get PicassoIV by itself and Mediator without ZorRAM and then run showconfig commmand we can predict what address space issues you may encounter. Note that as I do not have the desktop Mediator version there could be some PicassoIV problems with that that I am unaware of.
Use of PicassoIV compared with Indivision MKII is that it can perform higher refresh rates (like 150Hz PAL), and it has interlace flicker selectable in its early boot menu. In addition you can use it as an extra graphics card with multiple monitors. Also as in my case, you can have the 3 addon boards for tv tuner, video in/out, 16 bit sound in/out.