Thank you! 'chipset VESA' works beautifully. Though not without a little effort. 'vgatest' first complained that src/driver.h/MAX_REGS was not large enough, so I installed the source package, and recompiled with the recommended value. After that vgatest ran, but was corrupting my console's font. Setting 'VesaText' in /etc/vga/libvga.config solved that.
So far every svga tool that I've tried works, i.e. the ones distributed with the svga library, zgv, and pcdsvgaview. Vince Virgilio