= HF8V = / = SP8WJT = / = SP0106RZ =
HF-17266
PROJECT: HF-17266
DESCRIPTION: Fiscal Cash Register DF302 LB130FM6 POSNET
TYPE: DF302 LB130FM6
BRAND: POSNET
STATUS: n
PROJECT START DATE: 2018
LOCALISATION: PL
DOCUMENTATION: TM (7 pages, PCB drawings, circuit diagram, GAL functions tables)
PCB: TPD58266
DIMENSIONS: 130 x 84 mm
HARDWARE VERSION: 2.02
SOFTWARE VERSION: 0.00
CPU CATALOG NUMBER: UC-291
CPU: SC87C51
CPU BRAND: INTEL (SIGNETICS)
FAMILY: '51
ROM: 4 KB
RAM: 256
ADR SPC: 64 KB
MAX CLOCK: 40 MHz
THN ADDRESS: 0x37
TYPE: 0x28
HF-17266 version 2.01
It was polish production cash register main board. I cutted original TPD57266 to TPD58266 removing some glue electronics, not particullary needed for me and in this way obtaining more compact system. Originally processor works on internal memory but it is not problem to switch it on external memory.
Complete reverse engineering has been made, I recreated circuit diagram, PCB assembly drawings, rescanned and tested functions of GAL chip, so now is time for software part. It will be more probably my THOS operating system.
PLCC44 socket allows me testing several another '51 CPUs in my collection.
U1: SC87C51 - CPU - PLCC44 removable
U2: 74374 - LATCH - address/data multiplexing
U3: ROM0 - [*]
U4: ROM1 - [*]
U5: 74LS07 - desoldered
U6: 7414 - 6 x INV
U7: GAL16V8 - PAL - memory mapping, reset
U8: 4020 - counter
U9: LM555 - desoldered
U10: 7805 - REGULATOR 5V (for memories)
U11: 7805 - REGULATOR 5V (for system)
U12: 74HCT08 - 4 x 2AND
U13: 24C02 - EEPROM
[*] - for security reasons this chip is totally covered by plastic glue and I cannot read its type. Must be tested by scanning it.
1/ Removed U5, U9 (version 2.00)
2/ Part of PCB cutted off, reregistered to TPD58266 (version 2.01)
3/ CPU PLCC44 socket desoldered and some connections modified. EA/ input moved from VCC to GND (switched to external memory) (version 2.02)
4/ Desoldesing ROM0, ROM1 for memory downloads (version 2.03)
5/ Modifications DIP28 memory circuit to DIP32 memory circuit (includes rerouting some paths from CPU and GAL) (version 2.04)
[1] SC87C51 datasheet
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