jm7e+@andrew.cmu.edu (Jeremy G. Mereness) (10/16/90)
If this has already been reviewed, please forgive. I just perused this month's Incider when I saw the RAMfast as the Editor's choice. It looks like a Apple High Speed SCSI only with 128K or more of cache on board. This looks exciting. Does anyone have one of these things? Does it work with e Transwarp? Reviews, please! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |Jeremy Mereness | Support | Ye Olde Disclaimer: | |jm7e+@andrew.cmu.edu (internet) | Free | The above represent my| |a700jm7e@cmccvb (Vax... bitnet) | Software| opinions, alone. | |staff/student@Carnegie Mellon U.| | Ya Gotta Love It. | -----------------------------------------------------------------------
spock@wrkof.incom.de (Martin Georg) (10/17/90)
In article <Ub6U4l600VQpEA9Wlm@andrew.cmu.edu> jm7e+@andrew.cmu.edu (Jeremy G. Mereness) writes: > > >If this has already been reviewed, please forgive. > >I just perused this month's Incider when I saw the RAMfast as the >Editor's choice. It looks like a Apple High Speed SCSI only with 128K or >more of cache on board. > >This looks exciting. Does anyone have one of these things? Does it work >with e Transwarp? Reviews, please! > > >^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >|Jeremy Mereness | Support | Ye Olde Disclaimer: | >|jm7e+@andrew.cmu.edu (internet) | Free | The above represent my| >|a700jm7e@cmccvb (Vax... bitnet) | Software| opinions, alone. | >|staff/student@Carnegie Mellon U.| | Ya Gotta Love It. | >----------------------------------------------------------------------- I have a RAMFast and the board works wery well with all my other Hard- and Software. But be aware the the Apple High-speed DMA SCSI card does NOT have anything like a cache or a special processor. In fact, the RAMFast is about three times faster that Apples card (I had a Apple-card for testing here). It also support up to eight partitions accessible from ProDOS 8, locking and removing partitions (from the drive list) as well as a very gfood low-level partitioning and formatting software. It also waits for your harddisk to come up after power-on. GS/OS with some CDevs, DA's and Setups boots in 12 secondsnd it works well with a Transwarp. And if you have a PC Transporter, you will be really looking about the HD-Speed under MS-DOS. Martin Georg, Frankfurt, Germany ----> Apple II froever! <----
scottr@gnh-applesauce.cts.com (Scott Rothstein) (10/21/90)
Apple's DMA SCSI simply transfers the accessed data directly to RAM, hence the speed (and the Direct Memory Access name). The RAMfast does this, plus 1) has its own 10 MHz processor 2) a lookahead cache that stores the next 7 bytes 3) a 256K cache scottr@applesauce.bb.ny
toddpw@tybalt.caltech.edu (Todd P. Whitesel) (10/21/90)
scottr@gnh-applesauce.cts.com (Scott Rothstein) writes: >Apple's DMA SCSI simply transfers the accessed data directly to RAM, hence the >speed (and the Direct Memory Access name). The RAMfast does this, plus >1) has its own 10 MHz processor The speed of the CPU is not very important, what's important is that it is a coprocessor and can run at full speed in the background while the computer does its own thing and sends the coprocessor commands when it needs something. >2) a lookahead cache that stores the next 7 bytes The lookahead feature is made possible by the coprocessor, you can set it from 0 to 60K for each partition; it generally helps when you are copying lots of little files. Todd Whitesel toddpw @ tybalt.caltech.edu