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harlandski
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35 votes
5 answers
4k views

Which ports are which on this Soviet ZX Spectrum clone?

28 votes
2 answers
4k views

Why does this BASIC program declare variables for the numbers 0 to 4?

21 votes
6 answers
4k views

Understanding INKEY$ in ZX BASIC

18 votes
2 answers
3k views

What does 'try again' mean in Unix v6?

15 votes
3 answers
3k views

Why does this ZX Spectrum machine code "Hello World" routine not produce the expected result?

14 votes
4 answers
3k views

Make a BASIC TAP file readable on Linux

11 votes
1 answer
673 views

Where can I get the errata sheet for Spectrum Machine Language for the Absolute Beginner?

11 votes
2 answers
1k views

What causes the monitor to reduce to four lines on BK 0010 Focal?

11 votes
4 answers
1k views

What is the difference (if any) between these two expressions in FOCAL?

9 votes
1 answer
1k views

Why do BK computers have unusual representations of $ and ^

8 votes
3 answers
493 views

How safe are modern motherboard-cleaning techniques for this 1987 Soviet portable computer?

8 votes
1 answer
498 views

Why does my Epson HX-20 apparently have much less RAM than expected?

7 votes
1 answer
554 views

What is the likely function of these circuit boards?

6 votes
3 answers
1k views

How to connect an HX-20 to a monitor via the RS232 port?

5 votes
1 answer
174 views

Why am I not seeing the results of several operations on this "Microtrainer"?

5 votes
1 answer
968 views

(How) can I boost my ZX81 video output with an external device?

4 votes
1 answer
226 views

Unexpected UL error / List problems Epson HX-20

2 votes
1 answer
986 views

Why did this Hitachi 6301 assembler routine only work once?

2 votes
2 answers
298 views

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

2 votes
0 answers
90 views

What encoding is this BK-0010-01 FOCAL file in?

1 vote
4 answers
303 views

Will any modern EEPROM programmer work with the IP3604/КР556РТ5?

1 vote
1 answer
184 views

Why does my Mikrolab randomly freeze and unfreeze, and what can I do about it?