Thanks to all who have responded regarding my questions about IIci performance enhancements. The responses have been very informative and helpful
Also: I have used that Ebay reference and have placed two bids, each one for 4 16MB 30 pin non parity SIMMs 60 NS. ====== Here is another request for information. I still use Image Writers (I have several spares as well) on both a Mac IIci and a 7300. Many years ago I was able to buy cleaning ribbons and regretably did not stock up on them as they worked very well periodically to clean the print head. I used the last of these clenaing ribbons many years ago. Does anyone know where these cleaning ribbons can still be purchased? Also: does anyone know or can point me to any reference manual or schematic that will allow me to understand how to take apart an Image Writer so that I can clean the print mechanism? Mel --- Gregg Eshelman <[EMAIL PROTECTED]> wrote: > --- Jeff Walther <[EMAIL PROTECTED]> wrote: > > > There are many NuBus video cards which will > provide > > 24 bit color on the IIci. > > There's also the 24AC, which is also Power Mac > compatable. > (Meaning that the acceleration functions work on PPC > as well > as 68k.) You DO NOT want version 1.0 of the 24AC. It > does not > work with System 7.5.3 or newer. Version 1.1 is the > one to get. > > > Daystar made the PowerCache accelerater which was > a > > 68030 based > > accelerator, which is the same CPU found in the > Mac > > II series and in > > the SE/30. However, the accelerator runs at 33 > MHz > > or 50 MHz. > > There may have been other speeds, but those are > the > > two I've seen. > > The 030 PowerCache had 32k onboard cache and came in > 25, 33, > 40 and 50Mhz versions, with optional matching speed > 68882 FPU. > Most had both chips in sockets, some of the 25Mhz > ones > had > surface mounted CPU. They can be upgraded, if you > want > to > unsolder the clock crystal and replace it along with > the CPU > and FPU. > > > If you get the 50 MHz version, that should, in > > theory double the CPU speed of your IIci, > > Yeah, baby! The 50Mhz with FPU is nice and fast, > especially > with lots of RAM in the IIci so you can run without > virtual > memory. I had 80megs in mine. > > The 030 PowerCache requires the control panel to > operate. > First you install the card and boot up. > > Then drop the control panel onto the System folder > and > let it > put it in Control Panels. Reboot! DO NOT run the CP > and flip the > "switches" to enable it! If you "enable" before > rebooting, you'll > have to reboot with extentions disabled, remove the > CP, reboot > and install it the right way. > > Now you may run the CP, flip the switches and reboot > to 50Mhz. > > The PowerCache switch enables the upgrade. The > PowerMath switch > redirects certain SANE math routines from the CPU to > the FPU > (even the onboard 25Mhz FPU if the PowerCache > doesn't > have one) > to supposedly speed up those math functions. > > > Daystar also made the Turbo040 accelerator based > on > > the 68040 CPU. > > There's also the Turbo 601 in 66 and 100 Mhz > versions. > The later 66Mhz ones were actually made with 100Mhz > CPUs > and some of the later 100Mhz ones got 110Mhz. A > 66Mhz > one > with an underclocked 100Mhz CPU can be "overclocked" > to 100, > but it's a difficult operation that involves finding > an > out of production chip as well as the faster > crystal, > and > moving some other surface mounted parts. I've not > seen > anything > on overclocking the 100Mhz Turbo 601. > > They both have 128K L2 cache onboard. They require > at > least > System 7.5, and originally shipped with that version > on floppy > disks. > > These do NOT require their control panel to be in > the > Control > Panels folder.When enabled, it sets something in > PRAM > so that > it's on the 601 at power on. You also get the early > PowerMac > startup sound. :) > From then on your "Power IIci" thinks it is a > "Powermac 475". That's because Apple only sold 601 > upgrades for > Macs with 040 CPUs, and apparently the way the model > ID's are > organized, the IIci would be just "below" the LC475, > for which > there are 601 upgrades, so the IIci/601 combo gets > assigned > the name and icon for an upgraded 475. > > The Turbo 601 will happily run OS 8.1, just keep a > 7.6 > 68k Disk > Tools floppy handy for when you zap the PRAM. There > are also > hacks to make OS 8.5 and 8.6 run on them. I don't > know > if anyone > has made OS 9 or 9.1 run on a Turbo 601. > > There's a Turbo 601 enabler. Systems prior to Mac OS > 7.6 always > require the enabler. 7.6.x only requires the enabler > on a boot > floppy. 8.1 does not require the enabler at all. > > The Apple 601 Upgrade control panel will disable a > Turbo 601, > but cannot re-enable it because it's only intended > for > 601 > upgrades installed in Macs with an onboard 040 CPU. > > I never tested to see if the Turbo 601 could boot > from > an HFS+ > volume. > > The Turbo 601 has SCSI Manager 4.3 in its ROM, but > it > appears > to be a buggy implementation. The control panel can > enable or > disable it, but no program I tried that requires SM > 4.3 could > tell it was there. I assume that's because the > programs checked > for the model of Mac and somehow "saw through" the > T601's ROM > that the Mac was a IIci, and since the IIci doesn't > have SM 4.3, > therefore it doesn't, period, even though with a > T601 > and the > SCSI Manager 4.3 enabled, it does. (There's an > excercise for > a Mac programmer, figure out how to A. detect the > T601's SM 4.3 > B. write an extention to force all apps that need SM > 4.3 to > find it in the T601's ROM.) > > It will be total Fandemonium! > August (Fri) 4th, (Sat) 5th & (Sun) 6th, 2006 > http://www.fandemonium.org > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! 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