The PB 190 was Apple's last model based on a Motorola 68040 CPU. The base model has a 640 x 480 4-bit passive matrix display; the 190cs has an 8-bit color display. Apple eliminated the internal modem bay and the ethernet port, forcing buyers to acquire the separately. Because the PC Card uses a 16-bit bus, ethernet performance is roughly 25% slower than on the PB 540.