Resource centre for ZX Spectrum games
using Manic Miner and Jet Set Willy game engines
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Message: 3778
Author: andrewbroad
Date: 09/10/2003
Subject: Re: Jonathan Harston's site
jet_visy wrote:
>And an even greater thing to find it sitting on some old and
>> On further exploration, I found evidence of a lost 48K JSW game-
>> engine far superior to our own, which uses 7 bits to dig deep into
>> the Spectrum's core to supply extra rooms for its advanced
>> industry.
>
> Would be a great thing to find it sitting on some old and forgotten
> disk or tape.
forgotten Web-page in emulator-format! :-)
http://www.mdfsnet.f9.co.uk/Software/JSW/JGH/Docs/
(Right-click JSW.tap and select "Save Target As..." in Internet
Explorer - when I tried to download it using Netscape, the TAP file
got corrupted; the SNA file just crashes.)
If I'd known of Jonathan Harston's extension for extra rooms, I might
never have decided to have 128 rooms in Party Willy. Originally it
was going to be one 48K JSW game, but when I worked out which rooms I
wanted to include, the total was 68.
Jonathan Harston's extension allows a 48K JSW game to have up to 72
rooms:
* Addresses 38656-38911 and 42752-43776 are unused, giving space for
6 extra rooms.
* If the colour-code system is bypassed then there is space for two
more extra rooms at 39680-39935 (colour-code sprites and attributes)
and 40448-40703 (colour-code instructions).
(It is not possible to use addresses below 32768 because 0-16383 are
ROM, 16384-23295 are video RAM, and 23296-33791 are used by JSW as
screen-buffers.)
[http://www.mdfsnet.f9.co.uk/Software/JSW/JGH/Docs/Rooms.htm ]
--
Dr. Andrew Broad
http://www.geocities.com/andrewbroad/
http://www.geocities.com/andrewbroad/spectrum/
http://www.geocities.com/andrewbroad/spectrum/willy/
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