Apparently it was a custom chip for the various sinclair (zx/spectrum) computers. * http://www.retroisle.com/sinclair/zx81/Technical/Hardware/custom_ula.php ht

Apparently it was a custom chip for the various sinclair (zx/spectrum) computers. * http://www.retroisle.com/sinclair/zx81/Technical/Hardware/custom_ula.php http://www.retroisle.com/sinclair/zx81/Technical/Hardware/cu... * https://www.bytedelight.com/?page_id=2678 https://www.bytedelight.com/?page_id=2678 * https://spectrumforeveryone.com/technical/zx-spectrum-ula-types/ https://spectrumforeveryone.com/technical/zx-spectrum-ula-ty...