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PC-XT Emulator on a ESP8266

   [11]mcuhacker01 [12]Uncategorized februari 22, 2018februari 28, 2018 1
   minut

   IMG_20180222_191015

   Can you run a 8086 PC-XT emulation with 640K RAM, 80×25 CGA composite
   video and a 1.44MB MS-DOS disk on a ESP12E without additional
   components?

   Yes, you can and I did.

   The CPU emulator is a port of Mike Chambers [13]FAKE86.
   And the composite video is based on the work of [14]Cnlohr and
   [15]Hrvoje Cavrak

   ESP8266_CBVS

   The video is output using DMA i2s and uses only about 10% of the CPU.
   The components makes a lowpass filter at 7MHz and a correct NTSC CVBS
   signal.

   The video has a resolution of 640×200 and is a subset of the upcoming
   ESP8266 TVout library.

   1MB of the flash is used as a swapfile and creates virtual RAM space to
   the emulation through a MMU caching system.

   The MS-DOS 3.3 1.44 MB bootdisk image is uploaded into the ESP8266
   flash and accessed from the emulator as drive A:

   It has been tested with MS-DOS 6.22 and works as well.

   I used MS-DOS for reference. To not break any copyright you can use a
   Free-DOS image available here: http://www.fdos.org/bootdisks/

   A HDD can be supported through SPI and the SD library.
   Networking is supported through the ESP8266 Wi-Fi.

   I’m using a 3.5″ TFT CBVS display so the text is quite small.
   A larger CBVS monitor will show a crisper picture.

   [16]Source code available here

     Some people have noted that it is too slow for any useful work. But
     it’s not.

     At the moment the code has no keyboard so to be able to get past
     BIOS boot the irq1 line is flooded with keyboard presses.

     This slows the emulation down.

     The ESP8266 runs at 160MHz and makes the emulated 8086 run at about
     300K instructions per sec, nearly the same as the original 4.77MHz
     8086.

     Once keyboard code is added it is actually very useable.

   IFRAME:
   [17]https://www.youtube.com/embed/5-ledn5xpnk?version=3&rel=1&fs=1&auto
   hide=2&showsearch=0&showinfo=1&iv_load_policy=1&wmode=transparent

   Once keyboard and mouse code is added, here are 2 of the GUI’s it will
   run:

   Windows 3.0

   WIN3.0

   GEM Desktop

   GEM



Publicerad av mcuhacker01

   [18]Visa alla inlägg av mcuhacker01
   Publicerat februari 22, 2018februari 28, 2018

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    1.
   [20]mcuhacker01 skriver:
       [21]februari 27, 2018 kl. 9:55 e m
       People ask, will I continue this?
       Yes, most certainly.
       Looking for options for the keyboard.
       P/S2 or chatpad?
       Also it needs graphics.
       CGA 320×200 and 640×200 are already ready.
       Mouse?
       You need that for GUIs.
       Audio?
       It already supports DMA PCM Audio.
       But for a PC it needs to be Soundblaster.
       Win3.0?
       I downloaded GEM1.0 as a default GUI.
       But I dont see any problems running windows once I have a pointing
       device.
       Lets see how far we can go.
       [22]GillaGillad av [23]1 person
       [24]Svara

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