Apple macintosh plus サービスマニュアル
![Apple](https://files.manualsbrain.com/attachments/2c022a7d1a76dcd8f02c04aa8d97faf41b63902f/common/fit/150/50/8a691e9df6162751590e2cef93a951cf3a39c94b6949421016232655b22d/brand_logo.png)
Specifications
Memory - 3
Memory
RAM
1 MB, expandable to 4 MB (150 ns or faster SIMMs)
ROM
128K
PRAM
CMOS custom chip with 4.5 V, user-replaceable battery backup
(includes 256 bytes of memory; remembers system
parameters even with the machine switched off)