Compatibility with the Power Macintosh; RAM Doubler now supports Macintoshes equipped with a PowerPC, 68040, 68030, or 68020 (with PMMU) processor.
For the Power Macintosh, file mapping is now implemented. File mapping is a technology which allows for a reduction in memory requirements by using the memory management unit to manage the loading and unloading of native code segments.
RAM Doubler's reliability on 4- and 5-megabyte Macintoshes running in 24-bit addressing mode has been significantly improved.
Many small changes were made for compatibility with Apple System 7.5. Note that RAM Doubler should not be used with the "SCSI Manager 4.3" extension. (See incompatibilities section.)
Various changes were made to improve reliability and speed of networking operations. If you had problems networking over EtherNET, be sure to also use Apple's Network Software Installer 1.4.5 or later.
A bug in the Mac ROM Memory Manager was worked around which could cause system heap corruption at boot time. (i.e., if your Mac hung at "Welcome to Macintosh", it shouldn't anymore under 1.0.2)
A bug in the Mac BlockMove routine on 040s was worked around.
Extremely large reads and writes (more than half of RAM being read or written at once) happening on unfragmented hard disk drives work without hanging now.
RAM Doubler handles unsuccessful calls to the OS routine HoldMemory more reliably.
MachTen and RAM Doubler now work together.
Changes were made to better support NuBus SCSI accelerator cards. RAM Doubler 1.0.2 will be able to work with a future version of the FWB JackHammer.
A hang on startup occuring on some 68040 accelerators for Mac II, IIx, IIcx, or SE/30 has been corrected.
Restarting no longer hangs on a Macintosh LC with a DayStar 040 accelerator. Restarting a II/IIx/IIcx/SE30 with more than 14 megabytes of RAM in 24-bit mode no longer hangs.
RAM Doubler no longer tries to use a CD-ROM or a locked removable drive to store temporary data onto.
RAM Doubler no longer crashes if the "use RAM for ROM" option for the AV Macs is set. Instead it disables itself.
RAM Doubler now detects the 68EC030 processor and disables itself accordingly. (Sorry, without an MMU, RAM Doubler can't function.)
Floating-point processing functions slightly faster on 68040s.
In cases where RAM Doubler must use hard drive space, the speed has been increased, and the disk space has been decreased.
RAM Doubler no longer complains about MacsBug versions 6.5 and greater. RAM Doubler remains incompatible with development releases of 6.3 and 6.4 versions of MacsBug, due to bugs in those versions which cause unreliable tracing and system hangs when run with RAM Doubler. Version 6.2.2 of MacsBug works fine. On a Centris 610, RAM Doubler will make the necessary patches so that 6.2.2 will work on your machine.
Using MacsBug to trace through priveleged instructions works correctly now, tracing only one instruction at a time.
We have made every effort to ensure compatibility with GeoPort on Power Macintosh. If you experience problems, try quitting all open applications except the Finder and the communications application you are using.
RAM Doubler is not currently compatible with the Radius Rocket or Fusion Data System’s TokaMac, Mobius Speedster 040, or Applied Engineering Transwarp accelerators. Generally, accelerators which do not support Apple's Virtual Memory will not work with RAM Doubler, either.
Along the same lines, non-accelerator hardware add-ons which are not compatible with Apple VM may have problems with RAM Doubler as well; all third-party PowerBook display cards, notably the Envisio display adapters, are not compatible with RAM Doubler.
RAM Doubler is not compatible with every FWB SCSI JackHammer. If an incompatibility exists, RAM Doubler will detect it and warn you of it; contact FWB for more information and the requisite upgrade.
Some hard disk drivers, notably early versions of Alysis’ eDisk, allocate memory in a way which prevents RAM Doubler from extending RAM. Contact your hard drive vendor if you receive the alert concerning a driver not in the system heap.
Hewlett Packard print drivers may exhibit slow performance or failure under extended memory (while running with either RAM Doubler or Apple virtual memory). This is because they attempt to allocate and make use of all available free memory while printing, even when they don't need to. The solution is to reduce this memory before trying to print, for example by opening several applications, or a special copy of TeachText with an unusually large partition, so that the "Largest Unused Block" reported by the Finder is smaller (we recommend trying to lower it to below 1500K if you are experiencing this problem.) HP's recently released DeskWriter 6.0 driver reportedly fixes this problem.
RAM Doubler is not currently compatible with usrEZ's UltraShield security software.
MacTCP 1.0 and 1.1 are not compatible with RAM Doubler; we suggest upgrading to version 2.0.1 or later which is compatible.
If you are using a Macintosh 660AV or 840AV, make sure you have at least version 1.1 of the "Enabler 088" file. Version 1.0 causes problems with the Express Modem when RAM Doubler is installed.
Some DSP plug-ins for Adobe Photoshop on the 660AV and 840AV do not work with RAM Doubler because they do not work properly in extended memory environments.
Network Software Installer versions 1.4.2 and 1.4.3 install network software which doesn't run quite properly under RAM Doubler. We recommend 1.4.4 (or later) which does.
