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Last week’s work was really about the new Apple IIgs target for vbcc and less about the particular things I was building with it. That said, it did result in a functioning Simulated Evolution port for the IIgs.
At some point since the last time I looked, the VBCC/Vasm/Vlink suite I generally recommend for Amiga and Atari ST development has also gained support for the 65816 CPU, with both SNES and Apple IIgs targets. That’s exciting, because GS/OS’s native Object Module Format for its ex...
No new projects this week; I’m still decompressing after the Spectrum project. Instead, I tried to reset a bit by reading through some of the books I’d picked up from the Vintage Computer Fair over the past few years. There’s a booth that’s been there for quite some time selling...
It’s finally time for me to wrap up this ZX Spectrum series, with a look at how to get the simple 1-bit beeper on every Spectrum model to emit high-quality digital audio. The results are quite good: it’s the last sound played on last week’s demo reel, and the difference between i...
My article from two weeks ago on fancy 1-bit sound on the ZX Spectrum was a bit incomplete. I used a shortcut to test out the “interleaved oscillator” technique, and I couldn’t get pulse-width modulation to work at all.
Last week’s work with CPU-controlled 1-bit sound generation went reasonably smoothly. I calculated the time required to get my results, then picked out some Z80 instruction sequences to get those timings. That said, I was mostly just winging it when I did so, and that’s kind of o...
As part of the ZX Spectrum tour, I implemented some routines that would let you play simple tones out of the 1-bit beeper. These were in large part inspired by earlier work I did on the Apple II. We know that’s not the limit, though, because we got some improbably good results ou...
After I did the ZX Spectrum shooting gallery project last month, I got to thinking about what lessons I could bring back to any of my earlier ports. The obvious candidate was the ColecoVision—same CPU, but a graphics chip that gave us proper sprites to work with. The Spectrum gra...
I went to VCFW again this year. Unlike last year there wasn’t a major overarching theme this time, but that meant more miscellaneous and serendipitous things to go alongside it.
Today we wrap up the tour of the ZX Spectrum that we started back in May. At this point the only topic left is the memory handlers on the 128K Spectrum. This didn’t see a whole lot of use in the original BASIC tour; the Spectrum’s Z80 CPU can only address 64KB of memory at a time...
I didn’t have a great deal of experience with the ZX Spectrum when I first created my Platform Guide for it. After this little tour, I’ve gotten my hands much dirtier, seen more capabilities, and worked around more limitations. I have, at this point, earned the right to a few opi...
Now that the shooting gallery is done and dusted, it’s time to turn to a piece of our initial tour of the ZX Spectrum that has been left untouched: sound. There isn’t a whole lot new here compared to what has come before on other platforms, but that in turn means that the core pr...
This week I’ll be finishing up the port of my Shooting Gallery Rosetta Stone program to the ZX Spectrum. After last week, the only thing left was shots and the logic surrounding them.
This week and next we’ll work through the port of my shooting gallery Rosetta-stone program to the ZX Spectrum.
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