Search found 17 matches
- 20 Aug 2020, 14:56
- Forum: Escape Meta Alt Control Shift
- Topic: Anyone got one for sale?
- Replies: 3
- Views: 8971
Re: Anyone got one for sale?
There is a Dutch company selling kits: https://www.budgetronics.eu/en/building ... a-25779-20
- 17 Aug 2020, 21:44
- Forum: Hardware and software hacking
- Topic: Ye Olde Gigatron and Gigatronski
- Replies: 11
- Views: 7764
Re: Ye Olde Gigatron and Gigatronski
Neither works.. The scope shows that it is oscillating, but the output voltage is very low. The propagation delay of these is about the same as the 74C04 according to the specification, but I doubt that would be the problem, as I see it oscillating nicely. Did you try to change the bias resistor? E...
- 11 Aug 2020, 18:43
- Forum: Hardware and software hacking
- Topic: Ye Olde Gigatron and Gigatronski
- Replies: 11
- Views: 7764
Re: Ye Olde Gigatron and Gigatronski
National Semicoductor's MM74C series has been introduced in 1976. So you could try a 74C04 instead of the '90s 74HCT04. However, it has 50 ns propagation delay and might be at its limit at 6.25 MHz. The CD4069A from the very first 4k CMOS series is even older. -A is the unbuffered configuration, wit...
- 28 Jul 2020, 12:36
- Forum: Hardware and software hacking
- Topic: Issue with building my own Pluppy McPlugface
- Replies: 14
- Views: 9673
Re: Issue with building my own Pluppy McPlugface
USB keyboards from the transition time, when PS/2 was still common, often support both protocols. Newer ones do not. If your USB keyboard came with a green PS/2 adapter it should work. If no adapter was included it is unlikely that this protocol has been implemented.
- 23 Jul 2020, 11:31
- Forum: Hardware and software hacking
- Topic: Raspberry pi loader
- Replies: 14
- Views: 10683
Re: Raspberry pi loader
So the first thing to do is to wire up the RPi's GPIO header to a female DB9 connector. You will need some sort of multi-conductor cable with at least 4 unique wires, (I would personally use a strip of ribbon cable for testing purposes and then clean it up later once it's running). Be careful, the ...
- 18 Jun 2020, 18:50
- Forum: Hardware and software hacking
- Topic: PucMon
- Replies: 23
- Views: 14695
Re: PucMon
This is the access time rating. You will need 150ns or faster. So all three versions should work.
- 09 May 2019, 22:22
- Forum: Hardware and software hacking
- Topic: Oscillator with 50% duty
- Replies: 3
- Views: 3721
Re: Oscillator with 50% duty
You should use 74HCU04 for an oscillator, not 74HC04. A 74HC04 actually consists of three inverters in a row, therefore it cannot be biased into linear mode (that's what the 1Meg resistor does).