Search found 7 matches

by oldcomp
Tue Sep 19, 2023 5:40 am
Forum: Computer hardware
Topic: LAN for 8-bit computers
Replies: 2
Views: 3314

LAN for 8-bit computers

how to connect more 8-bit home computers into LAN?
by oldcomp
Tue Sep 19, 2023 5:39 am
Forum: other MCU and CPU
Topic: keyboard controlller
Replies: 3
Views: 3303

Re: keyboard controlller

CPU 8042 or 8035 are often used as kbd controller
by oldcomp
Wed Aug 02, 2023 8:23 am
Forum: Computer Asylum
Topic: Stiff keys on the HP-85
Replies: 2
Views: 2182

Re: Stiff keys on the HP-85

no lubrication will help. If you pour oil in there, you will destroy the switch. The problem is in the cracked plastic line of the switch. The key gets stuck in it and won't come back.
by oldcomp
Wed Aug 02, 2023 8:21 am
Forum: Computer Asylum
Topic: tape drive on the HP-85
Replies: 2
Views: 2219

Re: tape drive on the HP-85

Nonsense, the tape doesn't rewind because the drive wheel is destroyed. Typical failure of HP tape drives.
by oldcomp
Tue Jul 18, 2023 9:06 am
Forum: Digital circuit w/o MCU
Topic: circuit A4350
Replies: 6
Views: 4308

Re: circuit A4350

so if i understand correctly i can use CMOS 4000 series for A4350 circuit?
by oldcomp
Mon Jul 17, 2023 8:31 am
Forum: Digital circuit w/o MCU
Topic: circuit A4350
Replies: 6
Views: 4308

Re: circuit A4350

I have several OKU calculators, but none of them work. They mostly have non-functioning buttons or broken wires to the keyboard board. I don't know where to reconnect the wires. So I thought of soldering the calculator circuit, making a new board and improving the calculator, adding memory and makin...
by oldcomp
Sun Jul 16, 2023 2:04 pm
Forum: Digital circuit w/o MCU
Topic: circuit A4350
Replies: 6
Views: 4308

circuit A4350

Does anyone have information on how the A4350 calculator circuit is connected? It is said to have been cloned by the Soviets and used in their calculators.