jeffs@wjvax.UUCP (04/10/87)
I was wondering if anyone was familiar with type-ahead feature on a
Model 4. Does Model 4 have it? If so, how do I enable it.Does TRSDOS 6.2
support it?
Thanks in advance.
--
I'll play it first and tell you what it is later.
Miles Davis
--------
jeffery siou
...!{ ucbvax!decwrl!qubix, mordor!turtlevax, ihnp4!pesnta}!wjvax!jeffs
the above opinion's expressed are solely those of mine and is not at
all that of wj's or in any way related to wj's(they don't have one).
--
dpz@paul.UUCP (04/12/87)
> From: jeffs@wjvax.UUCP (Jeffery Siou) > I was wondering if anyone was familiar with type-ahead feature on a > Model 4. Does Model 4 have it? If so, how do I enable it.Does TRSDOS 6.2 > support it? Yupper. It's been a while since I've had my 4P, but I believe the DOS command is "system (type="y")" under 6.2. dpz -- David P. Zimmerman rutgers!dpz dpz@rutgers.edu
wchao@topaz.UUCP (04/13/87)
Regarding the type-ahead feature on TRSDOS 6.2/LS-DOS 6.3, all you have to do is type in the following command at dos ready: system (type=y) Beware that sometimes it will loose a few characters when the system is SMOOTH (type: device at dos ready to see all the active logical devices). William Chao ARPA: wchao@blue.rutgers.edu UUCP: ..!seismo!topaz!wchao
rhealey@ub.D.UMN.EDU.UUCP (04/14/87)
The typeahead on TRSDOS 6 should be automatic when you boot up. -Rob Healey rhealey@ub.d.umn.edu
uhclem@trsvax.UUCP (04/17/87)
"What's wrong? Has the little 386 computer got another bug? Awwwwwww." > I was wondering if anyone was familiar with type-ahead feature on a >Model 4. Does Model 4 have it? If so, how do I enable it.Does TRSDOS 6.2 >support it? The hardware does not actually perform this function. It is entirely up to the operating system on the machine to create the illusion of nice keyboard hardware that has type-ahead. You know, never do or fix in hardware what you can cover with software. :-( The actual hardware is nothing more than an 8 x 8 grid of switches. Press one and a data bit is pulled low (later inverted) when a certain address line goes high (also inverted). That's why 4P's have such a hefty cable to the keyboard. It has at least 16 wires in there, plus shield! The LDOS 5.x and LS-DOS 6.3 (also TRSDOS 6.[012]) simply scan the keyboard every 33.33 msec, and if they find anything, it is shoved into a local queue, which in 6.2 & 6.3 is up in some leftover bytes at the end of the video static RAM. LDOS 5.x uses some space allocated in the memory allocated by the *KI driver, if you use it. The driver in ROM does not do typeahead. Since the keyboard hardware does not provide us with a nice interrupt or a scan code or anything, it must be polled frequently, and floppy I/O, or programs that disable interrupts a lot cause type-ahead to not work. There are also some prima-dona programs like Superscriptsit that scan the keyboard themselves, so they may not have a typeahead that works as well or has the same number of scans per second, etc. If you have used other operating systems (TRSDOS 1.x, CP/M+ from RS) you may have noted that typeahead does not work there. That is why. <This information is provided by an individual and is not nor should be construed as being provided by Radio Shack or Tandy Corp. Radio Shack/Tandy Corp has no obligation to support the information provided in any way. If those guys had listened to me, they would have implemented debounce correctly, even in typeahead mode. Oh well.> "Thank you, Uh Clem." Frank Durda IV @ <trsvax!uhclem> "Now place you hands on the keyboard and say... 'I will not turn too many bits on in my 32-bit multiplies again.' Repeat it 32 times."
mikey@bbimg.UUCP (04/21/87)
Early LDOS had some strange things in the keyboard scan/typeahead. Originally the entire keyboard scan was called, which took a lot of time. Later releases scanned ALL the lines, i.e., the address selected set ALL 8 address lines of the keyboard grid and it looked for ANY output on the data lines. If it found something, it then went back and did a regular keyboard scan. This speeded the OS up a LOT and got rid of a lot of wierd little problems. Mike Yetsko Boston's Beth Israel Hospital trsvax!techsup!bbimg!mikey
aa4@mentor.cc.purdue.edu (Antonio Mladinic) (07/29/89)
I need to read with a PC files (2) writen with profile plus in Model 4. I know some programs to do that, however I do not like to spend $100.- for a program that I will use one. Questions: There is a public domain program to do that? Some of you like to sell the convert program?
Thanks,
Antonio Mladinic