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Message: 5072

Author: john_elliott_uk

Date: 17/11/2005

Subject: Re: Stopped ropes bug fix / Not-so-perfect snapshots

 

In manicminerandjetsetwilly@yahoogroups.com, andrewbroad wrote:

BAS2TAP < http://www.worldofspectrum.org/utilities.html#other >
doesn't recognise "goto". I had to edit your listing as follows
before bas2tap -c would convert it into a TAP-file:
1090 go to 1010

I used zmakebas <http://rus.members.beeb.net/zmakebas.html>, which
does recognise 'goto'.

I was going to suggest inserting a PAUSE 0 into Line 160, giving the
user a chance to save a perfect snapshot - but when I tried this,
the resulting TAP-file (saved by JSWED 2.2.4) played an erroneous
title-screen tune, then the start-room killed me on entry! Don't do that then :-) Conclusion: The data aren't in the correct areas of memory after
loading the Spectrum-files and immediately prior to the machine-code
entry-point (USR 32039), but they *are* by the time you see the
title-screen.

Correct. Some of the code for bank 7 doesn't get moved there until
after BASIC has relinquished control, since in 128k mode BASIC uses
some of that bank. If you want to insert a pause, you'll have to do
something like:

160 POKE 32118,201
170 LET X = USR 32039
180 PAUSE 0
190 LET X = USR 33792

Why do "main.tun", "cheat.tun" and "tune.bin" exist as separate
Spectrum-files anyway, when they merely overwrite areas of memory
that were just loaded from rtime.j*2?

Historical reasons - in the original JSW128, rtime.js2 didn't go all
the way to the top of memory. It also makes it easier to replace the
tunes.

 

 

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