This is an archive of CompuServe forum messages from 1985 to 1995, as saved in transcripts by John Foust.
Search Results (2,128 messages)
Whoops…remember you don't want un-needed drivers in the OS, so there will be no HD driver for the system to go look for in your example!
#15024-
#Hard drive boots
Message #15220
Vic, The write protect ought to change when removing or inserting a disk. If for no other reason than the disk itself would generate an open circuit and no disk in the drive would generate a closed circuit (closed meaning write protected…open being non-protected).
#15088-
#Hard drive boots
Message #15178
I thought of it years ago. We made (and still have) some adaptor boards for the disk expansion port that allow you to use a standard drive as a real amiga drive; the interface monitors the write protect line (in hardware) and translates it into what AmigaDOS want's to see…
#15129-
#80286 Bridge Card When
Message #15172
Betty – that's a simplistic way of excusing a bad situation; and in fact, CBM has "done it right" so rarely with the Amiga that I would say there is no current experience with the first example ("wrong if they do") so we have no IDEA how the user base…
#15119-
#80286 Bridge Card When
Message #15162
Ron, I agree with much of what you say. The 2090/a contraversy leaves me more or less unmoved, as I don't see that it is important at all – actually, I think they are putting their effert in _Entirely_ the wrong place. If it were ME doing it, I would…
There will be; Right now, I'm not done – it will be a few weeks before I get things working the way I want them. Once done, however, all you need is a communications reciever with sideband capability – even a "bfo" might be ok, as long as it is…
Is there a simple, inexpensive receiver (or approach) for non-ham Amiga owners who still might want to experiment with picking up such fax transmissions using your interface? Rick
#14932-
#Satellite Weather
Message #15037
Your HQ-160 can "do" fax. Frequency stability affects the image as follows: if the radio drifts, the grey levels will shift. In the case of a simple interface, (a 16 level one, likely in the case of the amiga) your reciever would have to drift 50hz in order to shift…
#14853-
Auto-config
Message #14912
Mike, Ok, to implement a memory board this is the minimum that you need. Nibble 00/02 has to be filles out the the info describing your board. ie: bit 7 6 5 4 3 2 1 0 1 1 1 0 0 s s s s indicates the board size…
My design used a 74283 adder, but only because I made my board check that it didn't go beyond 9fffffH. I'd much rather have a second latch programmed during the autoconfig cycle to represent the ending address to use with a second comparitor and have the logic: if it's greater…
1) If one chose to keep the same sector size, there would be 50% more sectors per track. 2) If one chose to increase the size of the sectors, then the number of sectors per track would not necessarily increase by 50%. The above should be considered to be in…
#14808-
2090A question
Message #14817
You are talking apples and oranges, and are refusing to listen to those that are _trying_ to tell you what the 2090 does and doesn't do. Your host adapter, by itself, will not handle MFM or RLL drives. Period. End of statement. What your controller _does do_ is handle SCSI…
#14553-
#2090A question
Message #14816
RLL does have 1.5x the density of MFM encoding, however – therefor, when you have an RLL drive, you are going to have 1.5 x the miber of sectors given the same rotational speed – Right?
#14662-
2090A question
Message #14787
No. I repeat, you are off base on this issue. Darn it, I was AFRAID you were going to make me dig up my docs on this one. Excerpted from Electronic Design, January 24, 1985. Used without permission. "How RLL 2,7 upstages MFM and FM" "The read/write heads of disk…
#14555-
Phoenix Hard Drive
Message #14785
If it's the review that ran in Computer Shopper several months ago, you should know that it was somewhat biased. Performance of both systems was tabulated, and the Wedge came out a sorry second. Why? Because the Palomax was driving an RLL drive, the Wedge an MFM (which accounts for…
Mark, WShell comes back to life as soon as you click on its icon — it just reloads the library from LIBS:. If you put commands in your s:startup-wshell file to load the resident commands, it will re-do the resident list when you next open a WShell. It doesn't really…
The Amiga's memory management routine will do all they can to try to deliver the memory you ask for, including (if necessary) asking any resident but unused libraries and devices to expunge themselves. If a program really needs lots of memory, then it should of course ask for it and…
#14547-
#Satellite Weather
Message #14695
Ok – shortwave. Most noticable FAX outlet that you will hear in the US is on 8080.0 KHZ, out of Virgina. This outlet runs 24 hrs/day, and broadcasts series of wind-flagged, pressure marked, and long-term average condition maps. In addition, they broadcast (about 2 an hour) images obtained from Geostationary…
#14374-
#80286 Bridge Card When
Message #14682
Allowing arbitrary starting addresses causes an 'adder' to be included in the logic on all boards and, in general, slows down the access to that board.
#14625-
#WShell RESIdent Problem?
Message #14678
Why does it make a call that frees up mem? Well, there's only so much memory in the machine… and if you need a large chunk of it (contigenous) but there is a (theoretacle) 1 byte long library in the middle of it (not currently being used) then you can't…
Yup, I did miss that one. Not that I would've contributed anything, but it sure sounds like a monumental kludge to steal all possible memory unless you plan on using all of it. But now I'm even more concerned: does WShell itself go away, or just the resident commands? I…
#14301-
#WShell RESIdent Problem?
Message #14592
I guess you missed the great debate on BIX, where I attempted to talk Commodore out of recommending that developers put calls in their software asking for 8 megabytes, thereby flushing all libraries out of the system. WShell is built as a shared library and is designed to exit memroy…
#14507-
2090A question
Message #14551
Beg to differ. RLL has nothing to do with "sector layouts". RLL is not MFM. RLL is a BIT ENCODING scheme which stretches the limits of the number of consecutive zeroes or ones which are written to the disk. If you dig around you should be able to find some…
#14407-
#Amiga & NEC Multi-Sync
Message #14514
Elvin, The Amiga cable (23 pin to 9 pin) is layed out as follows: 9-Pin 23-Pin 1 (Gnd) 16 2 (Gnd) 3 (Red, Analog) 3 4 (Green, Analog) 4 5 (Blue, Analog) 6 6 (No Connection) 7 (Composite Sync -) 7 I just buzzed mine out. Hope that helps.
#14374-
80286 Bridge Card When
Message #14510
Actually, for the maximum flexibility, all memory boards should configure on their page boundries. In other words, if it uses 256K chips, it should configure on 256K boundries; 1M chips, 1M boundries…
#14453-
#2090A question
Message #14509
RLL is MFM. RLL deals with the number of sectors allocated on a given track of a drive. Standard drives use the same number of sectors on all tracks, RLL uses more sectors on outer tracks than on the inner tracks. It makes use of the fact that the outer…
#24406-
WB1.3 Questions
Message #24420
04-Dec-88 03:27:54 CBM has defined standard in which the file system resides on HD (it takes about 30 blocks). This allows autobooting without an ofs partition. When/if the file system is again upgraded, this allows file system update to the harddrive without requiring a rom change. Currently, only GVP and…
Gabe, Commodore hasn't documented anything regarding to how their shell can be invoked by Execute(), although I had thought that the 1.3 RUN command (which is used to process the command) was smart enough to look for shell-seg on the residnet list. There is a much better solution, however, which…
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