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2 votes

Why is the "jmp" instruction not working if I put data before it?

My approach: Throw more debuggers at it As already answered, having the data in the path of control flow will interpret the data as nonsense code causing a crash. The core reason for my answer is that ...
ecm's user avatar
  • 972
1 vote
Accepted

Installing MS DOS 6.22 under VMWARE

Ok. Got it. You need a MSDOS bootable .iso file to install from initially and a bootable MSDOS .img file assigned to the floppy a: to boot from following the install after using fdisk. You can't use ...
hptsb's user avatar
  • 119
0 votes

Is there a reason to prefer earlier versions of MS-DOS over later?

One reason would be if you need a feature in an earlier version of MS-DOS that was removed in a later version. The prime example that I can think of - which was my first exposure to the shock of ...
Andy's user avatar
  • 101
1 vote

What are the minimum system requirements to run GW-BASIC?

I think your issue is a simple incompatibility with DOS 6.x. Your GWBASIC came with DOS 3.10. I’d wouldn’t expect it to work with anything but DOS 3.10. Early DOS 3.x releases saw a lot of changes ...
bitslasher's user avatar
0 votes

Towards people who were there, what programs did you use to develop applications for the IBM 5150?

Turbo Pascal 2.0 and 3.0 were revolutionary products that made it possible to edit, compile, and run programs entirely within the memory of a PC with 192K of RAM (probably even with 128K). Saving a ...
supercat's user avatar
  • 37k
1 vote

Towards people who were there, what programs did you use to develop applications for the IBM 5150?

As someone active in the PC retroprogramming community -- coding for old systems, directly on those old systems -- as well as having coding experience on the PC since the 80s, I've found that Turbo ...
Jim Leonard's user avatar
4 votes

Is there a technical reason why Datel Action Replay on PC required a card?

I understand that it's necessary to use hardware in some cases (e.g. action replay for an 8-bit console such as the NES) but for the PC it's less obvious. It's needed for the very same reason as it ...
Raffzahn's user avatar
  • 225k
12 votes

Is there a technical reason why Datel Action Replay on PC required a card?

Jean-François Fabre’s answer mentions a number of advantages of a hardware solution over software, but I think it’s worth expanding on the main reason (IMO): hardware can reliably generate an ...
Stephen Kitt's user avatar
24 votes
Accepted

Is there a technical reason why Datel Action Replay on PC required a card?

Disclaimer: I always managed with Turbo Debug on games, which relied exclusively on software, and only used the amiga version of Action Replay. That said, the hardware Action Replay on PC gives it ...
Jean-François Fabre's user avatar
1 vote

What are the minimum system requirements to run GW-BASIC?

Did you try loadfix? Even with setver older programs that run completely in the first 64k of ram on dos 5 and newer systems had this issue. If you choose not to do this then I'd suggest leaving dos ...
Michael T's user avatar
9 votes

What are the minimum system requirements to run GW-BASIC?

On screen it shows: GW-BASIC 3.10 (C) Copyright Microsoft 1983,1986 61934 Bytes free Looks quite fine to me. Whenever I try to launch the program in one true DOS 6.20, so without the use of any ...
Raffzahn's user avatar
  • 225k
14 votes
Accepted

What are the minimum system requirements to run GW-BASIC?

One thing you may want to look at. I remember encountering a bug in one of the Borland products in that they complained of being out of memory on a 640K, himem-aware, DOS 6.22 system. That was due to ...
paxdiablo's user avatar
  • 4,917
9 votes

What are the minimum system requirements to run GW-BASIC?

There is no single GW-BASIC. Each OEM could customize portions of it to fit its own custom hardware. For example, I had an Epson computer with a 640x400 all-pixel-addressable video adapter on the ...
Euro Micelli's user avatar
  • 2,805
14 votes
Accepted

Is there any DOS game before Quake era (1996) that makes heavy use of the FPU?

MobyGames lists a number of games with support for a FPU¹. The earliest shown there are Falcon 3.0 and Scorched Earth (1991), and like most of the other games in the list, the FPU is optional: Note ...
Stephen Kitt's user avatar

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