ranger@ecsvax.UUCP (Rick N. Fincher) (12/15/86)
Apple II SCSI Card: Interrupt problem
System crashes on the Apple IIGS may occur with programs that use
interrupts
during access of SCSI disk drives connected to the Apple II SCSI card.
Once
interrupts are enabled, it's possible that an interrupt may occur during a
SCSI drive data transfer. A program initiates this data transfer by passing
control to the SCSI card.
On the SCSI card, the SCSI firmware places its own code on its own stack
for
executing. If taking an interrupt also places some code on the same stack,
wiping out some or all of the previous SCSI firmware code, then returning
from the interrupt returns to a portion of the stack that the interrupt has
corrupted, which results in some kind of unidentifiable system crash.
This implies that crashes are possible if BOTH of the following conditions
apply:
1. The SCSI card is used with an interrupt driven program, like
AppleTalk.
2. This application program calls the SCSI card directly, NOT using
ProDOS.
There are currently VERY FEW programs that may exhibit this problem. It
is
foreseen, though, that the programs that developers are currently working
on
may produce more errors. This is due to use of features in the Apple IIGS
that use interrupts heavily.
We highly recommend that customers follow a regular practice of backing
up
valuable data.
The SCSI card ROM is currently being fixed and readied for release. The
January AppleGram to the dealers will have a general announcement on
the issue.
Apple Technical Communications
patth@dasys1.UUCP (09/28/87)
Floyd Zink, Jr.'s *FREEWARE* Binary Library Utilities v2.21 now includes Don Elton's SQueeze/UNSQueeze program! Looks like this won't run on a ][+; requires enhanced ][e, ][c or ][gs. EXEC under ProDDOS. Documentation explains the addition of .QQ to the squeezed file. which adds squeeze/unsqueeze compression & packing of sub-dirs. This program also fixes a few bugs and adds some commands. BLU v2.21 EXEC and BLU v2.21 DOX have been uploaded to APPLE2-L@BROWNVM.BITNET. -- Patt Haring UUCP: ..cmcl2!phri!dasys1!patth Big Electric Cat Compu$erve: 76566,2510 New York, NY, USA MCI Mail: 306-1255; GEnie: PHaring (212) 879-9031 FidoNet Mail: 1:107/132 or 107/222
lbotez@pro-sol.cts.com (Lynda Botez) (03/11/90)
A friend of mine who reads this feed on a unix system claims that there are now two separate feeds... once called comp.sys.apple and another one called comp.sys.apple2. I'm wondering what's actually going on; since I've noticed the posting has gone down somewhat. And which one is this? (I'm called from a proline board, and it's called "apple/net"). Lynda
bsherman@mthvax.cs.miami.edu (Bob Sherman) (03/11/90)
In <17737.apple.net@pro-sol> lbotez@pro-sol.cts.com (Lynda Botez) writes: >A friend of mine who reads this feed on a unix system claims that there are >now two separate feeds... once called comp.sys.apple and another one called >comp.sys.apple2. >I'm wondering what's actually going on; since I've noticed the posting has >gone down somewhat. And which one is this? (I'm called from a proline board, >and it's called "apple/net"). >Lynda Your message was posted to comp.sys.apple. Yes there now is a comp.sys. apple2, and once it is up to speed in routings etc. I expect that comp.sys.apple will be discontinued. In the meanwhile they have suggested that messages be cross posted to both nets, so none are missed as systems change over. Some sites also refer to this feed as info-apple. -- bsherman@mthvax.cs.miami.edu | bsherman@pro-exchange | MCI MAIL: BSHERMAN >> Miami's Big Apple - 305-948-8000 - 24 hours - 300/1200 - PCP'able << >> Oldest Apple support board in Southeast. Now in its ninth year. <<