Resource centre for ZX Spectrum games
using Manic Miner and Jet Set Willy game engines
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Manic Miner & Jet Set Willy Yahoo! Group
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Message: 697
Author: john_elliott_uk
Date: 09/09/2000
Subject: Re: dynamic poke switching
<
h? hex?). i thought you could only poke a value of
up to 255 into one location? >>
Yes;
"h" stands for Hex.
To store an address
(which occupies two bytes) you split it up like
this:
LET x = (address - 256 * INT(address / 256))
LET y
= (address / 256)
POKE a, x
POKE a+1, y
With Hex, this becomes quite simple - for
the
address 8E34h, the value "x" is 34h and the value "y" is
8Eh.
<< how do i edit it?
>>
a Spectrum +3 with a Multiface. So I could type
Well, when I started doing JSW128, my main computer was
commands like this:
10 CLEAR 32767
20 LOAD
"RTIME.JS2" CODE 32768
30 PAUSE 0
40 SAVE "RTIME.JS2"
CODE 32768, 27689
and when it reached the PAUSE
0, hit the Red Button on the Multiface and use its
POKE-applying abilities.
These days I use various
home-brewed tools to achieve the same effect, including of
course JSWED itself; I wouldn't recommend their use for
a beginner. But the Multiface technique can be used
with Z80.EXE:
C:\>TAPCAT -N RTIME.TAP
RTIME.JS2
C:\>Z80 -ti RTIME.TAP
[once in Z80, load
"RTIME.JS2" from tape, and use the Multiface or BASIC to make
changes. Then save
as "NRTIME.JS2" to a new .TAP file
"NRTIME.TAP"].
C:\>TAPSPLIT NRTIME.TAP
C:\>DELETE
RTIME.JS2
C:\>RENAME NRTIME.JS2 RTIME.JS2
Alternatively, find a
good binary file editor - does anyone have any
suggestions?
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