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   Message 42 of 190
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   Re: C128D  more options
   
   
   Author:   Nicolas Welte
   Email: welte@chemie.uni-konstanz.de
   Date: 1998/12/28
   Forums: comp.sys.cbm
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Cameron Kaiser wrote:
> It looks like a CHGUTL command (a good description of it is on the bottom
> of p.95 in the 1581 user's guide [English]). However, it only says that
> retries may be set there, i.e. "u0>r"+chr$(retries). There's also a mention
> that fast serial can be toggled on and off with u0>b0, u0>b1 but neither
> of my 1571s understand this, so it must be a 1581-ism.

The B command is not listed in the 1570/71 manual, so it doesn't exist.
But I just had a look into my 1581 manual and the R command is somewhat
different, as it seems. Bit 7 is responsible for something called
"nichtadressierbare Hilfsspeicher" (I have the German manual) and I have
absolutely no idea what they mean with that! What's the English
expression for that? I'll have a look at Project64 if they have the
English manual right now...

> You would think that if it starts up in 1541 mode, it automatically goes to
> single sided mode, but it doesn't. I had to send the u0>m0 outright to get
> it to work.

Do you have it connected to a C128? My 1571 always goes to 1541 mode if
I switch it on without a 128 connected, or if I enter 64 mode with C=
and reset. No problems so far.

> By the way, I have just discovered that trying to access a single-sided disk
> with the head flipped over causes interesting and possibly damaging activity
> to the drive (grrrRRRRRRR KLACK KLACK KLACK t-t-TICK bzzz ... [power switch])
.

Yeah, that's funny. Also try this with a double sided (1571 mode) disk:
u0>m0 and then u0>h1. Krrrtttt krrrttt and again and again... (power
off)

Nicolas
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