帮助:ZX81 BASIC"Peek"功能 [英] Help: ZX81 BASIC "Peek" function

问题描述

我需要一种方法来确定字符('<')是否碰到了墙壁(黑色像素图形)

I need a way to find if the character ('<') has hit a wall (Black pixel Graphic)

-在ZX81游戏上.

我一直在看另一款使用代码的游戏

I'm been looking at another game... which uses code

if peek(peek 16398 +256*peek 16399) = code "**blackpixel graphic**" then ...

似乎为他们工作的人...

Which seems to work for them...

这是正确的代码吗?

我对地址，获取内存和东西一无所知.

I'm not really knowledgable with addresses and getting memory and stuff.

请帮助我...

-如果您知道更好的方法.请回答:)

-If you know a better way. Please answer :)

谢谢

推荐答案

peek读取内存位置的字节.根据 Sinclair ZX81的系统变量，内存位置和16399组成一个16位值，其中包含当前的显示文件中PRINT位置的地址" .

peek reads the byte at a memory location. According to The System Variables of the Sinclair ZX81, memory location 16398 and 16399 form a 16bit value containing the current "Address of PRINT position in display file".

因此，peek 16398 + 256*peek 16399将这两个值组合为一个16位地址，并且peek(可能)对该地址进行处理可以获取该位置的像素/字符(?).

Thus, peek 16398 + 256*peek 16399 combines the two values into a 16 bit address and peeking that address (possibly) gets the pixel/character(?) at that position.

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