Questions tagged [hx-20]
for questions about the Epson HX-20 laptop computer
5
questions
6
votes
3
answers
953
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How to connect an HX-20 to a monitor via the RS232 port?
Using & Programming the Epson HX-20 Portable Computer by Eric Balkan has a tantalising passage on p. 172*:
T.L. Ronson of the HX-20 User's Group also notes that a monochrome monitor can be ...
- 2,825
8
votes
1
answer
482
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Why does my Epson HX-20 apparently have much less RAM than expected?
When I enter:
STAT ALL
On my Epson HX-20, I get the following output:
P1: 419 Bytes
P2: 86 Bytes
P3: 0 Bytes
P4: 0 Bytes
P5: 0 Bytes
RAM FILE 256 Bytes
MEMSET 2624
105 Bytes Free
As I ...
- 2,825
2
votes
2
answers
274
views
(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 ...
- 2,825
2
votes
1
answer
882
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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 |
| ...
- 2,825
10
votes
1
answer
280
views
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 ...
- 1,562