Place the ht1130.py in the procs directory.
If you don't see "Holtek HT1130 (ht1130)" in the CPU selection, then check if Python support is working in IDA.
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This instruction set is heavily inspired by Intel's 4/8-bit instruction sets.
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The biggest problem is finding a ROM for this module. Because you can only get a ROM by photographing a chip's crystal under a microscope. The only known dump is here.
HT44300/HT443A0: same opcodes as HT1130.
HTG12G0, HTG1390, HTG13J0: doesn't have opcode 0x32 (was IN A, PM).
HTG12N0: opcode 0x34 is read as OUT PC, A (was IN A, PP).
HTG12B0 is different for ~10 opcodes.