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+--- Thread: Early Microbee main board PROM (/thread-830.html)
Early Microbee main board PROM - ChickenMan - 18-08-2024
Thanks to Cefiar for providing a dump of this PROM and some alternatives note.
The various early 1248 Microbee mainboards, including the original Kit 'bee, used a 82S123 PROM in position IC16, which is soldered in. But finally un-soldered and dumped. The 82S123 is a 256-bit TTL bipolar PROM (32 x 8) Tri-state output from Signetics and used as memory decoder.
Datasheets for the 82s123 are in the MbeeTech\Public\Datasheets\PROMs folder.
Cefiar also noted some replacement devices:
74S288 (National)
MB7112 (Fujitsu)
HM-7603 (Harris)
Am27LS19 (AMD)
Am27LS09 (AMD)
TBP18S030 (Texas Instruments)
63LS081 (MMI)
6331 (MMI)
Other possible replacements, but cannot verify:
IM5610 (Intersil)
MSL8215 (OKI data)
DM8577 (National)
M54730 (Mitsubishi)
So in the MbeeTech Repository in the Microbee/Software/PROMs folder we placed
82S123_IC16-PROM.bin <-- both in the one zip file
82S123_IC16-PROM.txt /