Path: utzoo!attcan!uunet!mcvax!unido!tub!tmpmbx!netmbx!hase From: hase@netmbx.UUCP (Hartmut Semken) Newsgroups: comp.sys.atari.st Subject: Re: VT100 clear screen; Reading chars from ST screen Message-ID: <1991@netmbx.UUCP> Date: 28 Jun 88 04:18:27 GMT References: <8806212005.AA08722@ucbvax.Berkeley.EDU> Reply-To: hase@netmbx.UUCP (Hartmut Semken) Organization: netmbx Public Access Unix, Berlin Lines: 34 In article <8806212005.AA08722@ucbvax.Berkeley.EDU> F026@CPC865.UEA.AC.UK writes: >>(Wil Groenen) writes: >>> I have a problem [...] reading a character from screen at current >>> cursor position. >>I do not have detailed knowledge about this (my manuals aren't here >>at the moment), but I would theorise that this is not possible. Tja, what is the "current cursor position" on a bitmap screen using a proportional spaced font? Whats a Cursor anyway? :-) > >Just to reduce the damper put on that idea, that's exactly what Acorn's >BBC Micro did: there was a system call to read the bits under the current >cursor position & compare them with the character bit-maps held in ROM, >to allow screen editing in modes 0-6. Puh! The Acorn machines are very well thought about. Before sold (if sold at all :-) >The BBC Micro was a 6502 8-bit machine running at standard speed (1MHz?): >I'm sure a 68000 can do as well! Remember: the 68000 is just twice to 3 times as fast as a 6502 (I still love my Apple ][!) Comp.sys.atari.st just gave me a little C program to do just that: compare the bitmap on the screen with the ROM-Font (witch ist not proportional :-). hase PS: my inews does not understand me. -- Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP High on a rocky promontory sat an Electric Monk on a bored horse. (D. Adams)