Re: Question on ProDOS SmartPort drive remapping

[dempson@actrix.gen.nz (David Empson)]

David Wilson <mcs6502@gmail.com> wrote:

> On Dec 17, 5:28 pm, demp...@actrix.gen.nz (David Empson) wrote:
> > Doesn't the II+ just have upper case in place of the lower case
> > characters (in the NORMAL range)? If so, the II+ will get a free ride if
> > you avoid IIe-specific assumptions such as the alternate character set
> > and inverted lower case.
> 
> As used on the Apple II+, the 2513 Chargen has the following layout:
> 
> Uppercase
> Punctuation & Digits
> Uppercase
> Punctuation & Digits
> 
> While 7 bit ASCII has
> 
> Control Characters
> Punctuation & Digits
> Uppercase
> Lowercase
> 
> So if you store lowercase to the screen it becomes Punctuation &
> Digits.

Ah yes, of course. The II+ doesn't actually store the INVERSE and FLASH
characters in its ROM, whereas the IIe does. (I'm much more familiar
with the IIe at this level, as I didn't delve into the low level parts
extensively until 1983, after my school upgraded its computers from
Apple II+ to IIe.)

> I know that KEYIN on the II+ maps lowercase to uppercase, I will have
> to check what COUT1 does.

I can't answer that one.
-- 
David Empson
dempson@actrix.gen.nz