kempston:
I do it the best possible way, i.e. I decode only A5-A7 and always reset
D5-D7 to 0.
palette:
How can I (or you) know what is the correct "real" palette? What is that
correct palette, where can I find documentation? Isn't it just dependent on
the brightness and contrast settings of a TV? This applies both to Sam Coupe
and ZX Spectrum palette - I haven't found any colour information on WoS or
other websites, so I did it simply mathematically - I construct the RGB
colour from the bits in the Sam/ZXS colour number. Visually, I can't see any
difference from other emulators on my crappy Samsung LCD display, but I'd
like to fix it if it's objectively wrong.
Best regards,
Aley
-----Původní zpráva-----
From: VELESOFT
Sent: Sunday, April 08, 2012 2:07 AM
To: [email protected]
Subject: Re: ASCD 0.98 (final) released
----- Original Message -----
From: "Aleš Keprt" <[email protected]>
To: <[email protected]>
Sent: Sunday, April 08, 2012 12:53 AM
Subject: ASCD 0.98 (final) released
* Fixed minor incompatibility in kempston joystick emulation (top 3 bits
were set instead of reset)
This is problem:
- Part of ZX Spectrum games work only with original kempston joystick
readable
also on port #DF (joystick port adressation is only A5=0 and all other
adress
lines are ignored = joy port BIN xx0xxxxx ).
- exist more versions of kempston joystick interface and often is used
models
with port adressation: BIN 000xxxxx or new interfaces use full adressation
BIN
00011111.
- old joystick interfaces send joystick value only to data lines D0-D4. Bits
D5-D7 are not set or reset, but contain part of floating data bus
(transparent
ula port #FF = videoram data). This three bith are readable always in log.1
only
if ula not read videoram data (in border area/after interrupt).
- modern joystick interfaces and some ZX emulators return always D7-D5 in
log.0.
Some ZX games also work only if D7-D5 is 0. Also all games/software writed
in ZX
basic need it.
Not exist any universal joystick standard, but often is used adressation:
BIN
000xxxxx and joystick return always D7-D5 in log.0 and D4-D0=joy state. D5
can
be used for joystick fire 2 and D6 for joystick fire 3. This is best. Old
problematic ZX games exist also in fixed version for use with any joystick
interface. (see W.O.S.)
My idea: can you add joystick autofire emulation ? :-D
VELESOFT
-----------------------------------------
Mgr. Aleš Keprt, Ph.D.
private: [email protected], www.keprt.cz
office: Moravian College / Moravská vysoká škola Olomouc, [email protected]
