Olivetti M21 - M24 BA106 / BA121 / BA135 / BA139 / BA170 / BA171 / BA196
Chipset
Socket 
FSB speeds 8MHz10MHz
Form factorOEM / Proprietary
Dimensions355mm x 304mm
Cache
None/Integrated in the CPU
Max RAM size
640KB
RAM type Empty
PSU connector
Empty
Also known as
- Olivetti M24SP BA801/BA177
I/O ports1x
Floppy interface
1x
Parallel
2x
Serial
Expansion slotsEmpty
Known issues
- Leaky Ni-Cd clock battery
The Ni-Cd battery may be leaking, risking damage to PCB layers & nearby components. Promptly remove the battery & clean corrosion/alkaline salts from the board. Use white vinegar to dissolve salts, but exercise caution as vinegar can corrode exposed metals. A thorough examination & repair may be needed. Replace battery with guide: https://github.com/wiretap-retro/Not-A-Varta
Notes
Discrete logic, no chipset
Last updated 2025-06-03T20:32:17Z
Board info score is 7.3/10
Chips
-> Chipset part
Intel 82284 (Clock Generator/Ready Interface)
Intel 82288 (Bus Controller)
(multiple brand) 74LS612 (Memory Mapper)
(multiple brand) Discrete Logic
Intel 8237A (DMA Controller)
Intel 8254 (Programmable Interval Timer)
Intel 8259A (Programmable Interrupt Ctrl.)
-> Floppy ctrl.
-> Human Interface
-> Real-Time Clock
4 BIOS files available
Olivetti - 4 entries
No drivers available
2 board documents available
Chip
Release date
File
Logs
Chip
Release date
File
Logs
Chip
Release date
1997-06-13
File
Logs
Chip
Release date
1997-06-13
File
Logs
Chip
Release date
1997-06-13
File
Logs
Chip
Release date
File
Logs
Chip
Release date
File
Logs
Image 1 of 3 (Microhouse)
Image 2 of 3 (TiBo)
Image 3 of 3 (TiBo)
Disclaimer
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