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Re: How Should I document Printing a DHGR image on an Apple II?

Cross-posted to 2 groups.

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In article <m2ftts$fkb$1@speranza.aioe.org>,
Bill Buckels <bbuckels@mts.net> wrote:
>"Scott Alfter" <scott@alfter.diespammersdie.us> wrote:
>>The bigger stumbling block is that the pixels on the HR and DHR screens are 
>>grouped horizontally, but need to be grouped vertically for printing.
>
>It's really easy to unmask these into individual pixels.
>
>>BASIC would be intolerably slow at this sort of bit-mangling.
>
>I think BASIC will need some help from ML. I'll get this working in C first 
>and decompose it back down to BASIC with as few ML subroutines as possible.

I didn't intend to imply that bit-mangling would be difficult (it isn't),
only that a BASIC-only implementation would be intolerably slow due to the
lack of bitwise operators.  Since a helper routine is already necessary for
output to the printer, I suppose another helper routine to do the
bit-mangling wouldn't be out of order either.

>Thanks for your thoughts. You can jump-in and write part of this anytime you 
>want. I may need some help with the ML routines for the BASIC examples when 
>I get to them. The C code I can easily manage after I get the printer output 
>routines fleshed-out.

I'll see what I can knock together.  The only thing I don't recall offhand
is whether the low bit of graphics data sent to the printer will fire the
topmost pin or the bottommost pin.  I'd have to dig up my manuals, as the
Imagewriter II manual I've found online doesn't include graphics commands
and the Imagewriter manual I've found is in French.

  _/_
 / v \ Scott Alfter (remove the obvious to send mail)
(IIGS( http://alfter.us/            Top-posting!
 \_^_/                              >What's the most annoying thing on Usenet?

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Thread

How Should I document Printing a DHGR image on an Apple II? "Bill Buckels" <bbuckels@mts.net> - 2014-10-24 06:40 -0500
  Re: How Should I document Printing a DHGR image on an Apple II? scott@alfter.diespammersdie.us (Scott Alfter) - 2014-10-24 17:04 +0000
    Re: How Should I document Printing a DHGR image on an Apple II? "Bill Buckels" <bbuckels@mts.net> - 2014-10-25 05:26 -0500
      Re: How Should I document Printing a DHGR image on an Apple II? scott@alfter.diespammersdie.us (Scott Alfter) - 2014-10-28 18:16 +0000
      Re: How Should I document Printing a DHGR image on an Apple II? scott@alfter.diespammersdie.us (Scott Alfter) - 2014-10-28 19:37 +0000
  Re: How Should I document Printing a DHGR image on an Apple II? "Christopher G. Mason" <cgm1@my-deja.com> - 2014-10-24 17:19 -0400
  Re: How Should I document Printing a DHGR image on an Apple II? "Bill Buckels" <bbuckels@mts.net> - 2014-10-24 19:43 -0500
    Re: How Should I document Printing a DHGR image on an Apple II? Steve Nickolas <usotsuki@buric.co> - 2014-10-25 02:30 +0000
    Re: How Should I document Printing a DHGR image on an Apple II? "Christopher G. Mason" <cgm1@my-deja.com> - 2014-10-24 23:01 -0400
      Re: How Should I document Printing a DHGR image on an Apple II? "Bill Buckels" <bbuckels@mts.net> - 2014-10-25 05:12 -0500
      Re: How Should I document Printing a DHGR image on an Apple II? scott@alfter.diespammersdie.us (Scott Alfter) - 2014-10-28 19:20 +0000
        Re: How Should I document Printing a DHGR image on an Apple II? "Bill Buckels" <bbuckels@mts.net> - 2014-10-28 16:24 -0500
    Re: How Should I document Printing a DHGR image on an Apple II? gids.rs@sasktel.net - 2014-10-24 21:15 -0700

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