commodore

What is an unused memory address?

由 为君一笑 提交于 2019-12-13 04:26:48
问题 Reading this HTML page on Commodore 64 memory allocations because I am interested in old computer hardware, I stumbled across a cell in the table that claims that the memory address is unused. What exactly does this entail? Does this mean that if you wanted to put something in that address you can put whatever you want? Confused, and would appreciate all answers. Thanks. 回答1: Memory maps should usually specify which programs use this memory. If they say "unused", this means that these

ca65 assembler and ld65 linker

由 那年仲夏 提交于 2019-12-10 18:49:05
问题 I'm beginning to use then ca65 assembler and ld65 linker on WIndows to create binary code for Commodore C64 computer, running on VICE emulator. I write this small "hello world" source on file "basic2.s" ;-------------------------------------- ; objetivo: assembly a header BASIC program ; to run binary code ; ; assembler: ca65 ; http://cc65.github.io/doc ; ; v101-c101 2018-08-09 13:50:53 A.Alonso ;----------------------------------------------------- PRINTTOKEN = $99 SYSTOKEN = $9e chrout =

Draw on screen border in Commodore 64

由 拜拜、爱过 提交于 2019-12-03 02:36:23
问题 Ok. I hope it does not get closed because I have this curiosity since 25 years and I would love to understand the trick. In the commodore 64 the border was not addressable by the 6569 VIC. All you could do was to draw pixels in the central area, the one where the cursor moved. The border was always uniform, although you could change its color with poke 53280,color if i remember correctly. Nevertheless I clearly remember games intros where the border was featured with graphics, like it was

Draw on screen border in Commodore 64

由 拜拜、爱过 提交于 2019-12-02 16:05:39
Ok. I hope it does not get closed because I have this curiosity since 25 years and I would love to understand the trick. In the commodore 64 the border was not addressable by the 6569 VIC. All you could do was to draw pixels in the central area, the one where the cursor moved. The border was always uniform, although you could change its color with poke 53280,color if i remember correctly. Nevertheless I clearly remember games intros where the border was featured with graphics, like it was fully addressable. I tried to understand how it worked but never got to the point. legends say it was a
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