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Questions tagged [hx-20]

for questions about the Epson HX-20 laptop computer

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(How) can I safely use direct addressing for machine code routines on the Epson HX-20?

I am working through the exercises of Lance Leventhal's 6800 Assembly Language Programming on my Epson HX-20. My understanding is that the HX-20's Hitachi 6301 processor is compatible with the ...
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Why did this Hitachi 6301 assembler routine only work once?

I am trying to learn assembler on the various retro machines I own, or am about to buy. Today I tried converting this 8080 routine (which worked, repeatedly): | START: | MVI A,0 | 8000 | 3e | | ...
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What to replace the belt in the cassette drive of an Epson HX-20 with?

I am the owner of an Epson HX-20 laptop computer. It runs well except for the builtin cassette drive which doesn't seem to work reliably. After carefully disassembling it I found that the belt seems ...