Search found 211 matches

by snarkhunter
Thu Jan 16, 2020 7:36 am
Forum: Dragon General
Topic: Autostart tape program?
Replies: 2
Views: 225

Re: Autostart tape program?

This is most likely a case of autorun program. I seem to remember autorun was achieved by saving code to be loaded in the lower memory page (first 1024 KB of Dragon's memory), overriding the EXEC vector. I also think Dragon User once published some source code to achieve a similar result. The only o...
by snarkhunter
Fri Jan 03, 2020 8:47 am
Forum: Dragon General
Topic: Launching Dragon 32 games in floppy format ?!
Replies: 14
Views: 1375

Re: Launching Dragon 32 games in floppy format ?!

Many machine-code programs will just not work - or not properly - under MAME. This is rather harsh and not true! The Dragon driver is considered working, so if there's an issue it needs identifying and reporting so that it can be corrected. Sorry, I did not mean to offend anyone here. This statemen...
by snarkhunter
Thu Jan 02, 2020 2:33 pm
Forum: Dragon General
Topic: Launching Dragon 32 games in floppy format ?!
Replies: 14
Views: 1375

Re: Launching Dragon 32 games in floppy format ?!

Hello, why Speed ​​Racer works well with XRoar & not with MAME ?! ... I'd say this is because XRoar is a dedicated Dragon emulator that provides state of the art low-level emulation, whereas MAME is more general-purpose (and much older, too). Many machine-code programs will just not work - or not pr...
by snarkhunter
Mon Nov 25, 2019 9:52 am
Forum: Software Requests
Topic: Up Periscope
Replies: 6
Views: 2440

Re: Up Periscope

Hello,

I would tend to believe the "178OR" bit in Line 26 might account for this error.
I myself would add a blank space between the figures and the logical operator ("178 OR").
by snarkhunter
Mon Nov 25, 2019 8:21 am
Forum: Dragon General
Topic: Launching Dragon 32 games in floppy format ?!
Replies: 14
Views: 1375

Re: Launching Dragon 32 games in floppy format ?!

Please note that some games require "detaching" the DOS after loading before executing them. This is because they use part of the memory pages that the DOS also uses. There are small utilities to achieve this (such as "Unboot" or "D-D") and you should find information about those somewhere else on t...
by snarkhunter
Tue May 28, 2019 9:01 am
Forum: Software Requests
Topic: Dragon demos for download?
Replies: 31
Views: 5671

Re: Dragon demos for download?

Not sure about this demo being available on a ".vdk", but here is a link to a YT video:

https://www.youtube.com/watch?v=4SSe7MgSEdk
by snarkhunter
Wed Apr 24, 2019 7:36 am
Forum: Dragon General
Topic: help 64k disk
Replies: 5
Views: 1842

Re: help 64k disk

Hello, I think it is still possible to directly address the WD2797 chip after disabling DOS on a Dragon computer. I seem to remember a friend of mine creating such routines back then, so he could load pieces of code that would require the whole RAM, including the DOS memory pages. He might have done...
by snarkhunter
Wed Mar 06, 2019 8:17 am
Forum: Dragon General
Topic: Read Flex disks on a PC ?
Replies: 20
Views: 4242

Re: Read Flex disks on a PC ?

prime wrote:Are you the same Roy Coates that did the Dragon versions of Manic Miner / Jet Set Willy ?
... and don't forget "Beanstalker"! I spent quite a few hours on that one, too...
by snarkhunter
Tue Dec 18, 2018 10:37 am
Forum: Uploads
Topic: FOGGY converted from ZX-Spectrum to 6809
Replies: 4
Views: 1340

Re: FOGGY converted from ZX-Spectrum to 6809

A nice job, for sure! But I still prefer the PMode4 display, that is much easier to "read". There are not so many games that look great under PMode3 ("Lunar Rover Patrol" being a notable exception).
by snarkhunter
Mon Oct 08, 2018 9:59 am
Forum: Software Requests
Topic: Adventure/RPG game on disk
Replies: 3
Views: 1975

Re: Adventure/RPG game on disk

Hello, and welcome! If that game was in French, then it's likely it was either "Graal Quest" or its sequel, "Creator Quest". I intended to create an English translation (both games play in French), but never actually found enough time to do so. These games are D&D-inspired: First, you have to genera...