E4809-045-035-A Okuma
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Okuma E4809-045-035-A is a main board from the E4809 CNC Boards series, identified by the alias MB0. It handles core functions such as CPU, DMA, RTC, PTM, and memory, and supports a maximum bubble memory of 16 Mbits with a maximum RAM capacity of 0.5 megabytes. The board works with standard RAM of 128 Kbytes and is compatible with bubble sizes of 128 Kbyte, 1, 2, and 4 Mbit, as well as RAM card sizes of 128 and 384 Kbytes.
Internal Product Review
The E4809-045-035-A is an Okuma main board for E4809 CNC systems, built around CPU, DMA, RTC, PTM, and memory functions. Standard 128 Kbytes RAM and support for up to 16 Mbits of bubble memory give the board a well-balanced memory architecture for stable CNC control. A very capable CNC board for dependable machine logic and clean system integration.
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Product Description:
The E4809-045-035-A is a main controller card designated MB0 in the E4809 CNC Boards series from Okuma. Installed in the base slot of an OSP numerical control, this main board forms the processing hub for spindle, axis, and operator tasks in an industrial lathe or machining center. Its role is to manage CPU instruction flow, direct memory access transfers, real-time clock ticks, the programmable timer module, and volatile memory so that motion sequences and HMI routines remain synchronized. Because it sits in the base slot, other CNC boards depend on it for address management and coordinated access to shared backplane resources.
The board supports bubble memory up to 16 Mbits, and its volatile storage peaks at 0.5 Mbytes, with a factory-loaded bank of 128 Kbytes for basic operating variables. Bubble cartridges plug into the dedicated window at FFDFC0-FFDFFF, while the processor sees program and data objects in the contiguous main space 000000-07FFFF. Each figure is an absolute address range on the dual-bus backplane, so the CNC kernel can issue byte-accurate fetches without bank-switching delays. That layout keeps application code, system tables, and service data in fixed locations during operation. Address decoding logic inside the board maps these regions and arbitrates DMA bursts between motion interrupts.
Expansion is limited to supported bubble capacities of 128 Kbytes and 1, 2, or 4 Mbits and removable RAM options of 128 or 384 Kbytes. General I/O tasks exchange status bytes through the main I/O region FFDD00-FFDE1F, while background diagnostics use the SVP window at F80000-F87FFF and the timing circuits remain isolated in FA8000-FAFFFF for deterministic cycle marks. The narrower main core span of FFDF00-FFDF9F helps keep supervisory registers separate from user code. Separating the I/O, diagnostic, and timing areas also reduces contention between routine status traffic and time-sensitive control activity.
