Workprint – May 2019

Last time I talked about the new, C64-specific version of C64CD blaster Stercore and this month continues that “trend”. It’s now officially called Stercore XD and I’ve actually got the majority of it written and working somehow!

Memory is getting very tight but all of the graphics are done now including some sprite animations – one of the aliens and the explosion have been “inherited” from Super Hyperzap – and everything just about fits into the lower half of the C64’s RAM after decrunching until the code grabs around 10K more whilst unrolling the background scroller. Spacial awareness is important here because I’m planning to put the final release version of Stercore XD out as a cartridge image for the RGCD competition. To that end the build process automagically makes a working CRT image for testing.

I still have a “to do” list including tweaks to the collision detection, a rewrite of the enemy movement code to optimise it, adding explosions and bolting in the simple attack wave driver from Super Hyperzap with a couple of small tweaks but, since there’s currently only about 280 bytes of ROM left in the 16K block the game has to occupy as a cartridge, some concessions might be necessary. To give a sense of scale, this paragraph is 457 bytes…

Workprint – April 2019

The work on pushing new graphics into the updated C64 version of Stercore is progressing slowly but surely; so far I’ve replaced pretty much all the original attribute-flavoured tiles with graphical versions – as in the screenshot from Char Pad below – but they’re still in need of tweaking to remove or rework some elements. It does look like there’s a reasonable amount of space left in the character set for some extra detail though and, although there’s a few ideas brewing for new graphics to add, I’ll need to sit down and check through the maps first to make sure everything is present and correct before assigning characters.

Apart from that there’s not much else going on at Chez Roundabout because I haven’t really had much time – a dodgy shoulder has been making typing very difficult for most of the last month, which is frustrating when you’ve got ideas but can’t do much with them – which goes at least some distance towards explaining the lack of blog posts – but there’s a few odds and ends on my “to do” list for when things hopefully settle down in a week or so. And at the same time there’s all of the regular urges to write yet another horizontally scrolling shoot ’em up that need be fought…!