Posted By
Chicken
on 2016-01-22
18:02:31
 |  Re: Command UI- on 1541
It's the (not so) well known "VIC20 mode". I tested this decades ago. The drive responds "normally" (in contrast to using this mode on a C64 – which won't work). However, loading was just (if at all) marginally faster.
Edit:
Not at home, so I didn't want to login. But spam protection made me 
I just head a déjà vu … Talking about 1551 detection in the other thread and "UI-" here. I knew this "happened" before.
And I remembered where and found it … in Mike Dailly's blog:
https://www.blogger.com/comment.g?blogID=17487316&postID=3556243265765451151&bpli=1
Scroll down to my comment or read here:
"jsr $eda9
bcc 1551 is used
On plus/4 and 1541 drives the "UI-" (ElCheapo speeder ) works if the screen is switched off."
So SVS, don't forget to change $ff06 before loading 
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