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Re: Virtual serial drive
Il giorno sabato 8 settembre 2012 23:47:14 UTC+2, Michael J. Mahon ha scritto:
> Riccardo <rigreco.grc@gmail.com> wrote:
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> > Il giorno sabato 8 settembre 2012 21:08:36 UTC+2, BLuRry ha scritto:
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> >> Yes, the //c can do it. It is the same 6551 as found in the Super
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> >> Serial Card. In fact, I used an Apple //c to develop the Apple Game
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> >> Server which uses 115.2k baud. The only problem I've had with it is
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> >> that my home made serial cable is not properly shielded and is very
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> >> error prone after a few years of improper storage (whoops! that's my fault though)
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> >> http://hackaday.com/2006/05/25/apple-game-server/
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> >> -Brendan
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> >> On Saturday, September 8, 2012 1:35:10 PM UTC-5, Riccardo wrote:
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> >>> Il giorno sabato 8 settembre 2012 20:19:57 UTC+2, Riccardo ha scritto:
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> >>>> Il giorno sabato 8 settembre 2012 12:14:51 UTC+2, Riccardo ha scritto:
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> >>>>> Ok, I restart to studied "Inside the Apple IIc" by Gary B. Little
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> >>>>> 1985, Chapter 11, "The Serial Interface Ports", from page 299 to page
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> >>>>> 324, it's the great work. And reopen my old book: "Sistemi a
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> >>>>> microprocessore" by R. Baranzini, D. Capezzuto, G. Dugnani, HOEPLI 1986.
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> >>>>> First:
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> >>>>> - //c have two 6551 ACIA (Asynchronous Communication Interface Adapter)IC
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> >>>>> - PC/MAC typical use Intel 8251A USART (Universal Synchronous Asynchronous
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> >>>>> Receiver Transmitter)IC, i think.
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> >>>>> both IC implement AIA RS-232-C and have two phases:
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> >>>>> Programmer and Communication
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> >>>>> Right, my first question:
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> >>>>> At page 307 Figure 11-3 of "Inside the Apple IIc" book, show max
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> >>>>> set-up speed to 19200 bit/s, but i great currently work up 115200
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> >>>>> bit/s with ADTPro, Why ?
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> >>>>> see you to next step.
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> >>>>> Thanks
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> >>>>> Riccardo
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> >>>> Thanks,
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> >>>> Another choice:
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> >>>> 1) With Prodos Utilities v 1.0 1984 Apple //c original:
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> >>>> 110 - 300 - 1200 - 2400 - 4800 - 9600 - 19200
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> >>> 2) with Prodos Utilities v 3.1 speed set-up at:
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> >>> 50-75-110-134.5-150-300-600-1200-1800-2400-3600-7200-9600-19200
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> >>> 2^4 = 16 combination bits, it's clear that utilities do not use any
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> >>> combination, by the way:
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> >>> at combination 1111 of the 6551 control register, what speed
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> >>> correspond? 19200 or 115200 bit/s
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> >>> Is it possible exists variant of 6551 IC built in //c ?
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> >>> Ric.
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> > Shielded a serial cable it's no problem, try to twisted single wire is
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> > more efficient to shield whit metal, like a Ethernet cable. I'll studied
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> > yours apple game server, it's a great work. By the way if we programmed
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> > serial port especially in assembler we need to know well the 6551 control
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> > register, at combination of 1111 what speed correspond ?
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> > Tanks Bernard.
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> > Riccardo
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> Assuming that the 6551s are mapped into /DEVSEL space as it is on an SSC,
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> all you have to do to run at 115kb is to initialize $C0sB to $10.
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> For slot 2, that's $C0AB. For slot 1, it would be $C09B.
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> -michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
Thanks dr. Michael,
I found a data-sheet http://archive.6502.org/datasheets/mos_6551_acia.pdf
there are two mode, standard baud rate up to 19200 from 0001 to 1111, and non standard baud rates with external clock up to 125k baud (depend by the system clock i think).
by the way, i think that the correct bit pattern is $00 instead $10, because the four bit indicate the receiver clock source (0= external, 1= internal).
Riccardo