[Coco] MyRam vs, Rammer
L. Curtis Boyle
curtisboyle at sasktel.net
Sun May 12 18:03:16 EDT 2019
There are two pluses in the RAMMER column (at least in the bug fix version in EOU Beta 4) - since it mimics “real” drive geometry (number of sides, sectors per track, tracks), it works with the BACKUP command (so you can back up real floppies in 1 pass to either direction.
It also supports the special /MD descriptor (“memory descriptor”) for debugging. This lets you both view and modify memory anywhere in the 2 MB while the system is running. Not for the casual user, but very helpful for testing special cases, error trapping, etc.
Sent from my iPhone
> On May 12, 2019, at 3:04 PM, Gene Heskett <gheskett at shentel.net> wrote:
>> On Sunday 12 May 2019 03:33:08 pm coco at jechar.ca wrote:
>> What are the pros and cons of MyRam vs Rammer for 512K and 2 Meg
>> systems ?
> From the author of MyRam, not a lot for a 512k system, although bringing
> it into existence, just access it by any handy command, like a "dir /r0"
> and it will be formatted and ready to use in about 100 milliseconds and
> a deiniz /r0 it when done to demolish it and get every byte back for
> other uses may still be an advantage. See my README for how to adjust
> its size in 8 kb chunks. I've used it for c compiler scratchpad set for
> 1.7 megabytes on my 2 meg machine, probably at least a thousand times.
> If you don't have a hard drive, it will speed up a compile thats using a
> floppy for scratchpad a very noticeable amount. With scsi hard drives,
> and probably even the ide drives, it won't be noticeably faster because
> the drive is not the speed limit, the coco is. It takes 11 seconds for
> the coco3 to move a megabyte. Thats slow considering modern SSD's with
> a sata interface on a slow atom cpu are doing 120+ megs/second these
> example from one of my machine controller boxes, with a 1.4GHz dual core
> atom cpu:
> gene at shop:~$ sudo hdparm -tT /dev/sda1
> [sudo] password for gene:
> Timing cached reads: 1808 MB in 2.00 seconds = 904.15 MB/sec
> Timing buffered disk reads: 368 MB in 3.00 seconds = 122.58 MB/sec
> gene at shop:~$
> And thats slow, another machine with more butterfly's in the cpu is doing
> 192 for that last figure.
> Cheers, Gene Heskett
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
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