VGA double scanning vs double character height in graphics modes?

Posted on Today, 11:29

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by superfury

in PC Emulation

in PC Emulation

I know that, at least in graphics modes, the VGA can perform double scanning intwo ways: - Enable double scanning itself. - Changing the character height to 2 scanlines. Usually, the double scanning is used. What would the difference be when changing the character height to 2 lines instead?

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2021-01-24, 21:44

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by superfury

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Just managed to fix an issue with UniPCemu's RCR 32-bit instruction shift amount. It was performing modulo 33 instead of just masking the lower 5 bits.

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Re: adding another to win98 in pcem

Posted on 2021-01-18, 04:05

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by superfury

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When it's started up in MS-DOS mode, usually just fdisk. Otherwise, first type "cd \windows\command" (assuming windows folder is named windows) first. After those, it's as mentioned.

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Re: adding another to win98 in pcem

Posted on 2021-01-18, 03:04

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by superfury

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Try and reboot in MS-DOS mode. Then execute FDISK again. Does that show the second hard disk? It should be the option below the bottom option(3 or 4? Depends on the FDISK version.) to switch to the second hard disk, then use option 1 and it's options to create a partition. If FDISK in MS-DOS mode …

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Re: adding another to win98 in pcem

Posted on 2021-01-16, 22:46

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by superfury

in PC Emulation

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You need to have the secondary drive added on an IDE controller for Windows and FDISK to recognise it. FDISK or other compatible partitioning software always needs to be run first. Only after that will Windows see and display the drives in My Computer(this is true for all Windows versions). Does …

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How is a non-present slave detected on an ATA channel?

Posted on 2021-01-16, 20:34

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by superfury

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How does a non-present slave 'respond' when only the master is present? I've implemented it as Bochs does, but the i440fx BIOS seems to take an extraordinarily amount of time to detect it before erroring out? The master is detected correctly, but the slave has an weirdly long delay before not being …

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Unexplained network behaviour when UniPCemu's SLIP server is running?

Posted on 2021-01-15, 18:54

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by superfury

in PC Emulation

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I notice that, once UniPCemu's SLIP service is running and connected to(by a maximum of one client somehow), the connection that's connected will pretty much halt when the host is doing something on the same website. The reverse seems to happen when the host opens a website while the SLIP client is …

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2021-01-14, 19:32

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by superfury

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in PC Emulation

Found another bug in the connection code(noticed it when trying Rise of the Triad). It was filling the modem's receiver buffer with a response to handle, causing it to constantly receive data, while it in fact shouldn't(there was nothing to receive). That's because the checks for receiving have two …

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Re: adding another to win98 in pcem

Posted on 2021-01-14, 13:30

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by superfury

in PC Emulation

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You run the fdisk program from the C:\WINDOWS\COMMAND folder. Choose the option for selecting the disk(where you should select the disk that's newly added). After that you need to create an extended partition and logical drive. That's explained in https://www.youtube.com/watch?v=satl8PNW_DI . Go to …

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Windows 10 virtual serial port using Dosbox nullmodem protocol?

Posted on 2021-01-13, 10:12

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by superfury

in PC Emulation

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Is there a way to make Windows 10 see a serial port, which is connected using Dosbox's TCP connection-based nullmodem with 0xFF escapes for RTS->CTS and DTR->DSR/CD connection? UniPCemu supports it now, but I want to use software on Windows 10 (mainly NT4 kernel debugger using said COM port) to …

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2021-01-12, 21:23

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by superfury

in PC Emulation

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Just modified break signal handing a bit. When the modem module receives a break signal update, it will check the signal's break line(like DTR and RTS). When the signal goes high(not when it stays high), the signal is latched (which will cause it to report to the UART when the input buffers are …

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Re: CasetteBASIC Only Seeing Apostrophes

Posted on 2021-01-10, 22:37

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by superfury

in PC Emulation

in PC Emulation

Perhaps try the Landmark/Supersoft BIOS? Or perhaps strip down the test386.asm one for 8086 instructions only?

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2021-01-08, 08:35

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by superfury

in PC Emulation

in PC Emulation

Just added the break signal transmitting and receiving on the UART and modem functionality. It will still only trigger a break error on the UART when the signal goes high and doesn't retrigger when it stays high for an unspecified amount of time. While break is active, the TCP connection won't …

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2021-01-08, 00:42

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by superfury

in PC Emulation

in PC Emulation

Managed to improve the connection some and fix some bugs with it. When connecting to a TCP server(making a TCP connection) as a client(dial-up modem dialling) it now won't count the connection as established instead of failing to make a connection(this was due to an incorrect result code when …

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Re: CasetteBASIC Only Seeing Apostrophes

Posted on 2021-01-07, 22:47

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by superfury

in PC Emulation

in PC Emulation

Perhaps it's some CPU instruction calculation error? Check conditional jumps and arithmetic instructions(affected flags)?

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Re: IBM T42 + Windows 98 sound blaster emulation

Posted on 2020-12-28, 19:35

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by superfury

in PC Emulation

in PC Emulation

Try running it in MS-DOS mode. Also check irq/dma/port settings in the game's settings(from within the game, I think it's called setup there as far as I can remember)?

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2020-12-24, 14:38

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by superfury

in PC Emulation

in PC Emulation

Eventually failed because of hard disk data shortage. Now need to create a 40GB HDD to move it to and recompile... :S Edit: It compiled and generated the ISO disk image without issues! :D Now I have a valid base for finding the issues? Now I can use addr2line for finding the code locations? This is …

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2020-12-24, 11:53

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by superfury

in PC Emulation

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Well, the machine was online all along (Latest Ubuntu running under the latest Virtualbox). So that shouldn't be part of the problem? All I did was executing "git clone URLHERE" followed by "git checkout R3.3.0" and during later tests a "git checkout master". The only other command executed was the …

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2020-12-23, 20:01

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by superfury

in PC Emulation

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Well, the machine was online all along (Latest Ubuntu running under the latest Virtualbox). So that shouldn't be part of the problem? All I did was executing "git clone URLHERE" followed by "git checkout R3.3.0" and during later tests a "git checkout master". The only other command executed was the …

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Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?

Posted on 2020-12-23, 14:54

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by superfury

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in PC Emulation

OK let's see if I have any better luck with the old 3.3.0 version (on Ubuntu 18.04LTS). I checked out v3.3.0 from "Stichting-MINIX-Research-Foundation" and launched "bash releasetools/x86_hdimage.sh". Oh wow, I didn't realize that this is from 2014! Btw, does your Ubuntu vm have internet access? I …

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