MFX SD card image: Is Hextrain hiding on it somewhere?

Posts related to the MFX Interface
Post questions about MFX and raise any issues or problems here
Post Reply
stephen_usher
Posts: 325
Joined: 27 Nov 2016 19:58

MFX SD card image: Is Hextrain hiding on it somewhere?

Post by stephen_usher »

I've read that the SD card image which comes with the MFX has a hidden partition ready for Hextrain. Does the image have the actual demo hiding somewhere?

I'd like to show off the demo at the Centre for Computing History in Cambridge this weekend and thought I'd ask before looking into what would be needed to get the demo installed.
Martin A
Posts: 799
Joined: 09 Nov 2013 21:03

Re: MFX SD card image: Is Hextrain hiding on it somewhere?

Post by Martin A »

The original version that Andy did is HTSD.COM I thought Dave had included that on the image.

If not it's in the hextrain archive from Andy's site, which is where I pulled it from for the original testing.
User avatar
Dave
Posts: 1280
Joined: 11 Aug 2012 18:16
Contact:

Re: MFX SD card image: Is Hextrain hiding on it somewhere?

Post by Dave »

Unless I co**ed up, it will be on the first partition

Regards
Dave
stephen_usher
Posts: 325
Joined: 27 Nov 2016 19:58

Re: MFX SD card image: Is Hextrain hiding on it somewhere?

Post by stephen_usher »

Thanks. I'll take a look.

P.S. Yes it's there as "ht.com" but you have to switch the VDP first using "vdp.com" before blindly starting it.
stephen_usher
Posts: 325
Joined: 27 Nov 2016 19:58

Re: MFX SD card image: Is Hextrain hiding on it somewhere?

Post by stephen_usher »

I tried it this morning and it works.

I think I may rename ht.com to hextrain.com to make it clear what it is. :-)
User avatar
Dave
Posts: 1280
Joined: 11 Aug 2012 18:16
Contact:

Re: MFX SD card image: Is Hextrain hiding on it somewhere?

Post by Dave »

CPMVDP is a program that Bill wrote so that you can start a COM game without having to do it “blind”

The single argument is the name of a com file (without the extension), as you’ll have seen, the program sends emulated VDP output to the VGA and starts the program.

(It is covered in the 1.1 Rev of the manual on page 131)

Regards
Dave
Martin A
Posts: 799
Joined: 09 Nov 2013 21:03

Re: MFX SD card image: Is Hextrain hiding on it somewhere?

Post by Martin A »

Whereas VDP.COM Martin wrote because he's to lazy to write the full fledeged launcher!

In theory it should work well enough in a 2 line xxxx.SUB file ie

Code: Select all

VDP
HT  (or whatever)
but I never needed to test it as Bill did his "proper" launcher
Bill B
Posts: 593
Joined: 26 Jan 2014 16:31

Re: MFX SD card image: Is Hextrain hiding on it somewhere?

Post by Bill B »

Marin's approach may be better if you have a very large .COM file. CPMVDP works by copying itself into high memory, then loading the new COM file beneath it, before jumping to the start of the new program. So it takes up a bit of the TPA while loading. Once the new program has started it can overwrite CPMVDP.

With Martin's approach, the switch to VDP mode is done first, then the operating system loads the new program, with the full TPA available.

This does not affect Hextrain. The COM file is fairly small. The large volume of Hextrain video data exists entirely outside of the CP/M drive images and is only accessed once the Hextrain COM file is running.
Post Reply