1. Original factory standard configuration (433 official parameters)

CPU: MC68LC040 @ 25 MHz (without FPU)

Form: 6U single-height (1 slot) VME SBC (430/431 are double-height)

DRAM: 8 MB (parity)

SRAM: 512 KB (battery backup)

Flash: 1 MB

I/O:

10Base-T Ethernet (10 Mbps, with DMA)

No SCSI interface (432 has)

2×RS-232 serial ports

2×IndustryPack (IP) slots (with DMA)

Location: 400 series single-height, 8MB, no SCSI, 2IP minimalist compact type

II. Comparison of All Models of the 400 Series (Quickly Differentiate 413/430/431/432/433) Table

Model Height DRAM SCSI Ethernet IP Slot-Core Position

413 2 High 4MB ✅ ✅ 4 Standard 2 High (Basic Model)

430 2 High 8MB ✅ ✅ 4 High-End 2 High (Full Interface)

431 2 High 8MB ❌ ✅ 4 High-End 2 High (No SCSI)

432 1 High 8MB ✅ ✅ 2 Compact High-End (With SCSI)

433 1 High 8MB ❌ ✅ 2 Compact High-End (Without SCSI)

Memory Mnemonic:

Double High = 4 IP; Single High = 2 IP

Last digit 0/2 = With SCSI; 1/3 = Without SCSI

413 = 4MB; 43x=8MB

III. Key Features of 433 (Compared with 432/431)

Comparison with 432 (Same as Single High): 433 = 432 - SCSI; otherwise, they are completely identical.

Comparison with 431 (Same as No SCSI): 433 = 431 - Dual High - 2IP; it saves more slots.

Advantages:

✅ Single High Saves Space: Occupies only 1 VME slot

✅ 8MB Large Memory: Twice as much as 413

✅ No SCSI More Stable: Reduces interface failure points

✅ 2IP Sufficient Expansion: Suitable for medium I/O requirements

IV. Application Scenarios and Replacement Suggestions

✅ Most Suitable for

Tight VME slots (Single High priority)

No SCSI storage required (Network/Flash can be used)

Medium program/data volume (8MB is sufficient)

2 IP modules expansion (such as serial ports/digital quantities)

?? Replacement Relationship

Replace 432: Direct replacement, only less SCSI, memory/IP/Ethernet remain unchanged

Replace 431: Dual High → Single High, saves 1 slot, IP from 4 → 2

Replace 413: Memory 4 → 8MB, Dual High → Single High, better performance + space