Posts by Richard Zealley
Texas Instruments TI99/4a
The Texas Instruments TI-99/4A followed the TI99/4, which was let down by a poor keyboard, and was released in 1981. Based on the TMS9900 microprocessor, the TI99/4 was the first 16-bit home computer.
Read MorePsion Organiser II
The Organiser II was launched in 1986 to follow the original Organiser from 1984. It had a better keyboard and display and a much larger ROM. There were three models (CM, XP and LZ) with between 8 and 64KiB RAM and a new single-tasking operating system
Read MoreEpson P-40 Operating Manual
Operating Manual for the Epson p-40P and Epson P-40S thermal, portable printer.
Read MoreEpson P40 Thermal Printer
The Epson P-40 is compact portable uni-directional thermal dot matrix printer which operates on NiCd batteries. It features various print modes including two bit image modes and character sets for 9 countries. It also has the ASCII 95 character set. It has a speed of 45cps for normal characters and 22.5 cps for enlarged characters.…
Read MorePascal Programming for the Apple
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Read MoreHewlett Packard HP 95LX
The HP 95LX was launched on April 23, 1991 before the term personal digital assistant, or PDA, found its way into everyday use putting the power of a computer into the palm of your hand. It ran MS-DOS v3.22 in 512K bytes of RAM and 1M-byte ROM and had a QWERTY keyboard and a separate…
Read MoreApple Pascal Disks
Information about the contents and use of Apple Pascal disks with Apple II computers including how to manage boot disks.
Read MoreApple Pascal on Apple IIe
Back In August I took delivery of a boxed Apple IIe in excellent working condition. I had used an earlier Apple II at university in 1982/83 to learn Pascal and hoped to find a set of Pascal diskettes which I duly did a couple of weeks later. I didn’t want to try and do too…
Read MorePsion Series 3mx Disassembly
A complete guide to disassembling a Psion 3mx and identifying where this can go horribly wrong based this on a recent example which I’d bought as spares/repair from eBay
Read MoreSinclair ZX Spectrum 48K
The much anticipated successor to the ZX81, the ZX Spectrum was originally released with options for 16K or 48K RAM. The 16K Spectrums were upgradable to 48K. It was recognisable by its distinctive rubber key keyboard and it sported rainbow stripes to indicate the introduction of colour, where the ZX80 and ZX81 were purely monochrome.
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