See what the
terminal actually
put on the wire.
momus parses SPDH and BIC-ISO messages and expands every field — EMV tags, token buffers, positional layouts — into something you can read.
momus — in Greek myth, the daimon of scrutiny and fault-finding, exiled from Olympus for criticising the work of the gods. A fitting patron for a tool that reads a message back to you, field by field.
It reads the formats a POS terminal really speaks.
Not a hex dump with a legend — a full decode down to EMV tags and the copybook layouts inside a token buffer.
Terminal ↔ host
FID and SFID fields parsed from the terminal-to-host dialogue, named and value-checked.
ISO 8583
The ACI BASE24 host protocol — all 128 data elements, labeled and structured.
Tag decoding
BER-TLV walked tag by tag: TVR, AIP, CVM, IAD, country and currency tables.
P-57 / P-63 buffers
COBOL-copybook token layouts expanded — scheme and co-network variants included.
One capture, checked against the other.
Author a test case once, then hold an SPDH capture against the BIC-ISO request it should have become — field by field, so a transform that drops a value can't hide.