1.1 --- a/ULA.txt Sun Mar 10 17:47:32 2013 +0100
1.2 +++ b/ULA.txt Sun Apr 28 22:43:13 2013 +0200
1.3 @@ -159,8 +159,8 @@
1.4 supposedly a replacement for the TMS4164-15 amongst many other parts. Similar
1.5 parts include the NTE2164 and the NTE6664, both of which appear to have
1.6 largely the same performance and connection characteristics. Meanwhile, the
1.7 -NTE21256 appears to be a 16-pin replacement that with four times the capacity
1.8 -that maintains the single data input and output pins. Using the NTE21256 as a
1.9 +NTE21256 appears to be a 16-pin replacement with four times the capacity that
1.10 +maintains the single data input and output pins. Using the NTE21256 as a
1.11 replacement for all ICs combined would be difficult because of the single bit
1.12 output.
1.13
1.14 @@ -344,8 +344,8 @@
1.15 input/output and the Caps Lock LED) would need to be reassigned and bit 0
1.16 potentially being made available for use.
1.17
1.18 -Palette Definition
1.19 -------------------
1.20 +Enhancement: Palette Definition
1.21 +-------------------------------
1.22
1.23 Since all memory accesses go via the ULA, an enhanced ULA could employ more
1.24 specific addresses than &FE*X to perform enhanced functions. For example, the
1.25 @@ -366,6 +366,12 @@
1.26 from the ULA, it is likely that the ULA is expected to provide only "high" or
1.27 "low" values.
1.28
1.29 +Short of adding extra outputs from the ULA (either additional red, green and
1.30 +blue outputs or a combined intensity output), another approach might involve
1.31 +some kind of modulation where an output value might be encoded in multiple
1.32 +pulses at a higher frequency than the pixel frequency. However, this would
1.33 +demand additional circuitry outside the ULA.
1.34 +
1.35 Flashing Colours
1.36 ----------------
1.37