fd4c1e193d
The //e 80 column firmware allows to switch between 80 and 40 clumns without clearing the screen. So far, I made that feature available via videomode(). However thinking about it once more, I don't see a C program making use of it. A C program rather benefits from the consistent behavior of videomode() always clearing the screen. Apart from that, the (default) 40 column display and the 40 column display with 80 column firmware active, behave differently (CH vs. OURCH) which causes subtile issues. Those issues can be avoid altogether by simply always deactivating the 80 column firmware when switching from 80 column display to 40 column display. Of course, those issues are also relevant, if the 40 column display with 80 column firmware is already active when the C program starts. However, I have reasons to believe that running the Apple II in that mode was/is very unpopular.
127 lines
4.7 KiB
C
127 lines
4.7 KiB
C
/*****************************************************************************/
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/* */
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/* apple2enh.h */
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/* */
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/* enhanced Apple //e system specific definitions */
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/* */
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/* */
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/* */
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/* (C) 2004 Oliver Schmidt, <ol.sc@web.de> */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef _APPLE2ENH_H
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#define _APPLE2ENH_H
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/* Check for errors */
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#if !defined(__APPLE2ENH__)
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# error This module may only be used when compiling for the enhanced Apple //e!
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#endif
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#include <apple2.h>
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Characters codes */
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#define CH_DEL 0x7F
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#define CH_CURS_UP 0x0B
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#define CH_CURS_DOWN 0x0A
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#define CH_HLINE 0x5F
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#define CH_VLINE 0xDF
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#define CH_ULCORNER 0x5F
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#define CH_URCORNER 0x20
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#define CH_LLCORNER 0xD4
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#define CH_LRCORNER 0xDF
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#define CH_TTEE 0x5F
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#define CH_BTEE 0xD4
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#define CH_LTEE 0xD4
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#define CH_RTEE 0xDF
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#define CH_CROSS 0xD4
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/* These are defined to be OpenApple + NumberKey */
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#define CH_F1 0xB1
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#define CH_F2 0xB2
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#define CH_F3 0xB3
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#define CH_F4 0xB4
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#define CH_F5 0xB5
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#define CH_F6 0xB6
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#define CH_F7 0xB7
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#define CH_F8 0xB8
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#define CH_F9 0xB9
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#define CH_F10 0xB0
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/* Video modes */
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#define VIDEOMODE_40x24 0x15
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#define VIDEOMODE_80x24 0x00
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#define VIDEOMODE_40COL VIDEOMODE_40x24
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#define VIDEOMODE_80COL VIDEOMODE_80x24
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/*****************************************************************************/
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/* Variables */
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/*****************************************************************************/
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/* The addresses of the static drivers */
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extern void a2e_auxmem_emd[];
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extern void a2e_stdjoy_joy[]; /* Referred to by joy_static_stddrv[] */
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extern void a2e_stdmou_mou[]; /* Referred to by mouse_static_stddrv[] */
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extern void a2e_ssc_ser[]; /* Referred to by ser_static_stddrv[] */
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extern void a2e_gs_ser[]; /* IIgs serial driver */
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extern void a2e_hi_tgi[]; /* Referred to by tgi_static_stddrv[] */
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extern void a2e_lo_tgi[];
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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unsigned __fastcall__ videomode (unsigned mode);
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/* Set the video mode, return the old mode. Call with one of the VIDEOMODE_xx
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** constants.
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*/
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void waitvsync (void);
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/* Wait for start of next frame */
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/* End of apple2enh.h */
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#endif
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