🚀 go-pugleaf

Hi all,

Here is a copy of a message I sent to VillageTronic
suggesting a simple trick to make their 3DFX module
useable in our Zorro II machines :

============== snip ============
Men,                                                      

I am very happy that you have reached the 500             
order level for the 3DFX module for the Picasso IV.       

I am one of the 500.                                      

I have ordered, even if I know that the module            
"should" not (see below) be able to run in my             
Zorro II A2000, because of the lack of address            
space problem (ie : you mentionned that the               
3D module would require 8 Mbyte address space,            
and Zorro II only provides 8 MByte autoconfig             
address space, out of which 4 are already ate             
by the Picasso IV itself).                                

Since the engineering of the board is in the process,     
I stronlgy suggest to you that you provide a "trick"      
to make the module usable in a Zorro II machine           
(which can be a towered A1200 or an A2000), since :       

1 - many P-IV owners run the board in Z II mode           

2 - owners of Z II P-IVs certainly do not run 68000        
processor, since a 68000 is not able to run                
Picasso 96 or Cybergraphix. They thus have a               
real 32bit adressing-capable processor.                    

3 - such a trick is not that complex :                     
provide a lead that one has to connect to an "upper-8"     
address line on his processor board, and we will be able   
to map the 8 MByte address space outside of the 8 Mbyte    
autoconf space provided by Zorro II !                      

(DCS 's Megachip runs that way to provide 2 MByte CHIP to  
non-AGA machines, and that's fine ! 0nly a lead to connect 
to an address bit somewhere in the machine).               

Regards,                                                   
Stephane.
============== snip ============

Regards,
-- 
St�phane GUILLARD  - stephane.guillard@steria.fr
A2kB3.1Ecs2M/GVP-M68060-60+64M+4.3G+32x/PicassoIV-Concierto/AriadneII
T : (+33) (0) 4 72 13 37 10 - F : (+33) (0) 4 72 35 99 22