Cambridge Z88

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Cambridge Z88
The Cambridge Computer Z88
TypePortable computer
Release date1987; 37 years ago (1987)
Operating systemOZ
CPUCMOS Z80A @ 3.2768 MHz
Memory32 kB RAM, 128 kB EPROM or ROM (internal memory) as standard
Removable storageProprietary RAM, EPROM or flash cards
Display640 x 64 integrated LCD display

The Cambridge Z88

AA batteries
for 20 hours of use.

It was packaged with a built-in combined

word processing/spreadsheet/database application called PipeDream (functionally equivalent to a 1987 BBC Micro ROM called Acornsoft View Professional),[4] along with several other applications and utilities, such as a Z80-version of the BBC BASIC programming language
.

History

The Z88 evolved from Sir

SCI Systems in Irvine, Scotland.[6]

Design

The 8-line LCD display used by the Z88

The Z88 is a portable computer weighing 0.9 kg (2.0 lb), based on a low-power CMOS version of the popular Zilog Z80 microprocessor. It comes with 32 kB of internal pseudo-static RAM and 128 kB of ROM containing the operating system (called OZ). The memory can be expanded up to 3.5 MB of RAM, the contents of which are preserved across sessions. An integrated capacitor prevents the Z88 from losing its data for the limited time it takes to change the batteries.

The machine uses a

AA batteries, giving up to 20 hours of use. It has three memory card slots, which accommodate proprietary RAM, EPROM or flash cards, the third slot being equipped with a built-in EPROM programmer. Card capacities range from 32 kB to 1 MB
.

The Z88 has a built-in eight-line, 64 × 640 pixel

twisted nematic
LCDs.

The 64 kB addressable by the Z80 processor are divided in four banks of 16 kB each. The maximum memory of 4 MiB for the system is also divided in 256 segments of 16 kB each. The hardware can map any of the 16 kB blocks to any of the four banks. The first 512 kB are reserved for ROM; the next 512 kB are reserved for internal RAM. The next 3 MB are assigned to each one of the three memory slots.

Postmarket upgrades

The stand and port of the Cambridge Z88

Since 1998, a 1 

AMD
chips and runs with 5 V for erasure. It is possible to read, write and erase flash cards in the three slots and the internal one.

It is also possible for an experienced user to replace the built-in 32 kB RAM chip with a bigger 128 or 512 kB static RAM chip. However, the latter requires some extra board modifications, and 512 kB is the biggest size that can be addressed by the Z88 for the internal RAM. A similar modification is possible for the internal ROM slot. A 512 kB flash chip can replace the original ROM, allowing an upgrade of the operating system.

See also

  • Dot space
  • Exact space

References

  1. ^ "Cambridge Z88". Timex/Sinclair - The Authoritative Website for Timex/Sinclair Computers. Retrieved 28 January 2023.
  2. ^ "Cambridge Z88". Steve's Old Computer Museum. 2020. Retrieved 28 January 2023.
  3. ^ Fasoldt, Al (1988). "Z88: Forerunner of modern notebook PCs". technofile archive - Al Fasoldt's searchable feast of all his reviews and commentaries, published online and in Syracuse's daily newspaper from 1983 to 2015. Retrieved 28 January 2023.
  4. ^ "Cambridge Z88 review: A Beeb By Any Other Name?". Beebug. 6 (7): 8. December 1987.
  5. ^ "Clive's new Z88". Sinclair User. No. 61. April 1987. p. 87.
  6. ^ "SIR CLIVE SWITCHES Z88 TO SCI FROM THORN". Tech Monitor. 3 September 1987.

External links

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