-Rich-@cup.portal.com (Richard Sherman Payne) (01/09/89)
This may not exactly follow the provious post, but this question came up on a local board. Does the //gs, in GS/OS, access the 3.5" drives at 1MHZ or at 2.8 MHZ, through the smartport. My understanding was that all access to the lower 64K were at 1MHZ. And that the drives were accessed through the lower 64K. I thought that the increased speed of GS/OS was the result of the 16 bit processor working more efficiently than the 8 bit (P16 v1.3) at the same speed. Dave Lyons, are you listening? Rich -Rich-@cup.portal.com
mvs@meccts.MECC.MN.ORG (Michael V. Stein) (01/12/89)
In article <13328@cup.portal.com> -Rich-@cup.portal.com (Richard Sherman Payne) writes: > >This may not exactly follow the provious post, but this question came up >on a local board. Does the //gs, in GS/OS, access the 3.5" drives at 1MHZ >or at 2.8 MHZ, through the smartport. My understanding was that all access >to the lower 64K were at 1MHZ. And that the drives were accessed through the >lower 64K. I thought that the increased speed of GS/OS was the result of >the 16 bit processor working more efficiently than the 8 bit (P16 v1.3) at >the same speed. Dave Lyons, are you listening? > The increaed speed of GS/OS is due to the fact that it can avoid some extra buffering that old ProDOS 16 ended up doing. In terms of processor rate, all accesses to anything in banks $e0 and $e1 occur at 1 Mhz, so all accesses to the actual sence switches controlling the drive are executed at 1 Mhz, but the rest of the code can be executing at 2.8 Mhz. -- Michael V. Stein Minnesota Educational Computing Corporation - Technical Services UUCP ihnp4!!meccts!mvs