Re: Problem implementing fixed point math in C/C++ app (32bit 16.16 fixed point), all results are 0.000000

Posted on Yesterday, 03:37

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Must be an issue with int type sizes, or compiler, same code works fine on gcc targeting x86_64 and 32-bit x86. I afterwards went through and changed the types to what they *should* be for openwatcom 16bit and it still gave me 5.0000 though, so I'd lean more on the side of compiler. I just figured …

---

Problem implementing fixed point math in C/C++ app (32bit 16.16 fixed point), all results are 0.000000

Posted on Yesterday, 01:25

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Hi, I'm using OpenWatcom 1.9, compiling code for MS DOS that uses the huge memory model, for a 8086 CPU target. I am currently in the process of converting the renderloop of my code into fixed point math instead of floating point math, for better performance on 8086 and up without an FPU present in …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-04, 23:32

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Great, It works %100 now :) Fantastic! Glad it works. The screen shot looks great. Good luck with your project! Thanks again :) Another question, I'm developing this for my 200LX, which has a very wide screen, so the 640x200 mono CGA mode has square pixels on it's LCD, but, on a PC monitor, this …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-04, 23:07

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Great, It works %100 now :) See the attached image of suzanne (the blender monkey primitive) :) It's got approx 450 polygons and I'm getting about 3 FPS on a 80186 @ 16MHz (My 200LX palmtop with doublespeed crystal installed) I've still many things to optimize, such as transforming every float uses …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-04, 22:25

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Wow thanks for all this work :) It's truly appreciated :) I'm gonna have a coffee, wake up and then have a try at blendering your code into my 3D rasterizer :) I'll report on the results here... Thanks again!, Terrence Hi. Sorry, I couldn't get your line code to work so I made a new version of my …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-04, 01:07

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Here's my pixel and line drawing functions (line does not use DrawCGAPoint, it has the code already in it): Sharing the complete source would not be needed and it's a LOT of code... here's what's important: void DrawCGAPoint (char *videobuf, int &videowidth, int &videoheight, int x, int y) { …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-03, 22:16

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Hi, FIrst of all a big thanks for writing this for me, it's highly appreciated! :) I tried it out, and it works, but, there are some interleaving artifacts, check out the attached screenshot... Any idea what that might be and h0w to fix it ? Cheers, Terrence Not sure if this is a 100% correct. I am …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-03, 04:46

by

by radiance32

in Marvin \ Software

in Marvin \ Software

you cant just cast a byte array to bool, and address it the way you do, its still a byte array underneath, not bits which is what cga is expecting (so bitbuf[( y * (width-1) ) + x] = true; wont do what you think its doing). you want to be doing bitwise ops with actual bits, not true + false on …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-03, 04:45

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Can someone provide me with a simple example function in C/C++ on how to set an individual CGA pixel in an offscreen buffer like this one: char *videobuf; videobuf = (char*) malloc (0x4000); // 16384 bytes eg I need a cheap/fast "setpixel(videobuf, x, y)" Hopefully without having to read the entire …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-03, 03:45

by

by radiance32

in Marvin \ Software

in Marvin \ Software

I can't provide watcom support, sorry. Maybe someone else can, either here or at VCFED forums. To understand CGA, I would suggest writing a small program that sets the graphics mode, then writes a byte of 0xFF to a pointer set to the address B800:0000. You will see 8 pixels show up in the upper …

---

Re: Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-03, 03:31

by

by radiance32

in Marvin \ Software

in Marvin \ Software

But, I've tried everything I can think of, and I just can't figure out the layout of the memory. CGA screen buffer in monochrome mode starts at B800:0000 and is 640x200 pixels, with 8 pixels to a byte. The mode is interlaced; the first 8KB half of screen memory are the even lines and the second 8KB …

---

Watcom C/C++ how to copy image buffer to CGA video memory buffer correctly ?

Posted on 2024-05-03, 02:57

by

by radiance32

in Marvin \ Software

in Marvin \ Software

Hi all, I've veered into C/C++ development for 16bit 8086 DOS targets, and I am currently experimenting with graphics. After reviewing all the tools out there, I have finally, after trying many options, started my project with OpenWatcom 1.9 on my Windows 10 PC, using DOSBOX as my execution & …

---

Re: Looking for small CF card that works with HP 200LX palmtop without using acecard3 driver

Posted on 2023-10-16, 03:18

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

without requiring the acecard3.sys driver ACECARD3.COM? driver in question http://mizj.com/acecard3.zip There are a couple of people on vogons with appropriate knowledge to be able to tell whats going on. Yup, I have the driver already, and I'd really love to hear from anyone who has any detailed …

---

Re: Looking for small CF card that works with HP 200LX palmtop without using acecard3 driver

Posted on 2023-10-15, 23:25

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

How do you know if it's compatible with the 200LX ? Only a very small amount of cards work. I have approx 25 cards all from sandisk/sundisk (most), canon and transcend, mostly 8MB, 16MB, 46MB, 128MB cards, and none of them work without the acecard3 driver... Also, many sellers on ebay are chinese …

---

Re: Looking for small CF card that works with HP 200LX palmtop without using acecard3 driver

Posted on 2023-10-11, 20:56

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

available on ebay. 10pcs for 20$ "10PCS 16MB Sandisk Compact Flash Card 16MB CF Memory card SDCFB" How do you know if it's compatible with the 200LX ? Only a very small amount of cards work. I have approx 25 cards all from sandisk/sundisk (most), canon and transcend, mostly 8MB, 16MB, 46MB, 128MB …

---

Looking for small CF card that works with HP 200LX palmtop without using acecard3 driver

Posted on 2023-10-11, 06:09

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi everyone, I wanted to make a new video for my Palmtop Tube channel, which I havent done for nearly a year now,due to some health issues and moving house etc...' But, I can't find my 16MB CompactFlash card (due to the move, it's probably hiding in a box somewhere) anymore. This is my only CF card …

---

Re: New video: Running Minix 2.0.2, a UNIX-like OS on the HP 200LX Palmtop.

Posted on 2023-09-10, 22:22

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm willing to sell you my copy. It's original, with manual in the plastic cover, with a disk and the license key. Never used... Please contact me on terrence dot vergauwen at gmail dot com to discuss... Terrence Hi there! It seems that site is ~20 years old and hasn't been updated since. 😟 https:// …

---

Re: HP200LX early 90's Palmtop PC with Adlib sound games videos

Posted on 2023-07-25, 01:06

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks! I knew you had the parallel version. Those are as rare as unicorns. I’m just getting the serial version because it was $14 on eBay and I want a serial port. I don’t have the cable. I need to make one like you did. My Palmtop doesn’t even arrive until Friday haha Where in the world are you …

---

Re: New video: Running Minix 2.0.2, a UNIX-like OS on the HP 200LX Palmtop.

Posted on 2023-07-24, 22:19

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, The only way (that I know of) is to buy a license. There's a company that sells HP 100/200LX machines and spare parts and cal sell you a carousel license. It's called "palmtop paper": https://www.palmtoppaper.com/store/software.htm I've searched high and low, with google etc... and never found …

---

Re: HP200LX early 90's Palmtop PC with Adlib sound games videos

Posted on 2023-07-24, 22:17

by

by radiance32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Does anyone know if the Quatech SSP-100 works with the 200LX? I am still trying to find the SPP-100 to get sound going at some point but I found a good price on the SSP-100 for a serial port in the meantime. I don't have the cable that connects to the port on the right of the unit, but even if I …

---