slowdowns in XT and IBM AT 286 emulation
Posted: Fri 01 Sep, 2017 1:23 pm
Hello, everbody.
I'm new in the forum. I'm not an English speaker.
PCEM is my favourite emulator because it is focused to emulate accurately the old hardware of '80 and '90. I used to have a Turbo XT in early '90, whit no hard disk. a 360kb floppy, an Hercules monochrome graphics card and a Phospor amber monitor.
I find specialy interesting, the posibility to use EMS memory (like Laser XT) and a Hard drive in these machines, because back in the day it was too expensive.
(I now i can see how it worked with Windows 2.0 and its apps)
It is a very interestig proyect for gaming and historic purpose.
I use other emulated hardware for Windows 3.1 and 95 too. But i found more interest the machines od late '80.
Now, the bugs.
First i discovered that the Vtech Laser XT 3 has an 8086 CPU running at 10 Mhz, according the Manual http://www.minuszerodegrees.net/manuals ... Manual.pdf
Also I' want to report a bug in the emulation on XT machines an IBM AT 286. The promblem is a slowdown that happen in certain games with these machines.
Some of them can render the game unplayable.
And it can Lock up the system if VGA card is used.
The games and MAchines I Tested:
Whit Vtech Laser Turbo XT and XT 3, Tandy 1000 SL/2 (with tandy 3-voice and DAC) and Amstrad 1640 with EGA graphics, And IBM AT 286 with VGA.
* Prince of Persia 1.0 and 1.3: The slowdown is more noticeable when the guard or the animation of fire is present. And if VGA is used the system may Lock-up
And whit Laser XT and XT 3 with Hercules And CGA.
* Bubble Bobble: It has a lot of it. (specialy when more than 3 enemies appear)
* Tetris (Spectrum Holobite, 1987): The games run flawlessly, no problem here.
* Tom & Jerry Cat-Astrophe: The slowdown is less noticieble.
Another Problem is that some CGA emulators for the Hercules Card, does not work. (for example the emulator MONO.COM. Back in the day i used it for Bubble Bobble.)
i Attached the file here (Mono.com). It works even in Dosbox with Indiana Jones and Last Crusade (from Us Gold 1989).
I'm grateful to the Devs. and the Contributors, who brought back to life these old and little known hardware.
I'm new in the forum. I'm not an English speaker.
PCEM is my favourite emulator because it is focused to emulate accurately the old hardware of '80 and '90. I used to have a Turbo XT in early '90, whit no hard disk. a 360kb floppy, an Hercules monochrome graphics card and a Phospor amber monitor.
I find specialy interesting, the posibility to use EMS memory (like Laser XT) and a Hard drive in these machines, because back in the day it was too expensive.
(I now i can see how it worked with Windows 2.0 and its apps)
It is a very interestig proyect for gaming and historic purpose.
I use other emulated hardware for Windows 3.1 and 95 too. But i found more interest the machines od late '80.
Now, the bugs.
First i discovered that the Vtech Laser XT 3 has an 8086 CPU running at 10 Mhz, according the Manual http://www.minuszerodegrees.net/manuals ... Manual.pdf
Also I' want to report a bug in the emulation on XT machines an IBM AT 286. The promblem is a slowdown that happen in certain games with these machines.
Some of them can render the game unplayable.
And it can Lock up the system if VGA card is used.
The games and MAchines I Tested:
Whit Vtech Laser Turbo XT and XT 3, Tandy 1000 SL/2 (with tandy 3-voice and DAC) and Amstrad 1640 with EGA graphics, And IBM AT 286 with VGA.
* Prince of Persia 1.0 and 1.3: The slowdown is more noticeable when the guard or the animation of fire is present. And if VGA is used the system may Lock-up
And whit Laser XT and XT 3 with Hercules And CGA.
* Bubble Bobble: It has a lot of it. (specialy when more than 3 enemies appear)
* Tetris (Spectrum Holobite, 1987): The games run flawlessly, no problem here.
* Tom & Jerry Cat-Astrophe: The slowdown is less noticieble.
Another Problem is that some CGA emulators for the Hercules Card, does not work. (for example the emulator MONO.COM. Back in the day i used it for Bubble Bobble.)
i Attached the file here (Mono.com). It works even in Dosbox with Indiana Jones and Last Crusade (from Us Gold 1989).
I'm grateful to the Devs. and the Contributors, who brought back to life these old and little known hardware.