The PDP-8 is a family of 12-bit minicomputers that was produced by Digital Equipment Corporation (DEC). It was the first commercially successful minicomputer, with over 50,000 units sold during the model's lifetime. [1]

The PDP-8/L was a effectively a cost-reduced version of the PDP-8/I in the PDP-8 line; it apparently had the same CPU as the -8/I. The primary differences between the two are: The -8/L was slightly slower; The -8/L used a positive I/0 bus, not negative; The -8/L was not pre-wired for a number of devices

Digital Equipment Corporation made several models of its successful PDP-8 minicomputer (for a more expensive, earlier version of the machine see 1989.0521.02), This is the relatively small, light, and inexpensive PDP-8L. It came in a metal box with orange writing and switches.

PDP-8 （用户 通常称为“PDP-8”）是 数字 设备公司 (DEC) 的 Programmed Data Processor 系列的 12 位小型 计算机。 它是第一台商业上成功的小型计算机，销量超过 50,000 份， 考虑 到兼容副本，估计甚至高达 300,000 份。 底层 设计 沿用了 LINC 的设计，但减少了指令集，而这又是 PDP-5 指令集的扩展。 后来，DEC 的类似 机器 是 PDP-1 2（PDP-8 的现代化后继产品）和 PDP-14 工业 控制 系统。 最初的 PDP-8，后来被非正式地称为“Straight-8”。

Digital Equipment Corporation made several models of its successful PDP-8 minicomputer (for a more expensive, earlier version of the machine see 1989.0521.02), This is the relatively small, light, and inexpensive PDP-8L. It came in a metal box with orange writing and switches.

在这篇文章中，我们先会简要介绍一下PDP-8和SimH，然后再介绍如何组装PiDP-8。 但是，什么是PDP-8呢？ 它是1965年推出的12位机器，并似乎是世界上第一台成功的小型电脑机。

只有一个算术寄存器，和 PDP 其它系列一样有 indirect addressing。 因为地址有12bit而一个指令除去3bit的op code和1位direct/indirect addressing bit后只有8bit，8bit中的第一位是0就从0000-0177取对应地址，是1则在当前page取地址。

The PDP-8 is a 12 bit single accumulator machine which can address up to 32K 12 bit words. It has 8 basic instructions and the PDP-8/E executes them in 1.2 microsecond for simple instructions to 4 microsecond for complex memory reference instructions.

id: 308; docname: DEC-8L-HOAA-D; doctype: Manual; title: PDP-8/L KD8L Data Break Interface Functional Description; date: February 1970; size: 861220; filename: pdp-8L ...

The PDP-8 computers were the most widely spread minicomputers of the world. In 1978, DEC was advertising them by having sold 50.000 units worldwide. The first version, the primary PDP8 was still assembled with discrete transistors and had …