Search found 291 matches

by stephen_usher
Fri Jun 21, 2019 10:06 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 797

Re: Cartridge Port: Would a buffer board help with problems?

I'm wondering how feasible it would be to add pull-up resistors into the address lines on the cartridge. I've no way of making a PCB with a male edge connector and female edge connector. Could this work for you: https://www.ebay.com/itm/NEW-Atari-ST-cartridge-DEV-PROTO-board-Atmel-Microchip-Arduino...
by stephen_usher
Fri Jun 21, 2019 10:01 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 797

Re: Cartridge Port: Would a buffer board help with problems?

This is how shockingly bad the address bus is on the STE cartridge port... (Triggered on falling edge.)

IMG_1499.jpg
IMG_1499.jpg (75.06 KiB) Viewed 345 times
by stephen_usher
Fri Jun 21, 2019 9:39 pm
Forum: HARDWARE DISCUSSIONS
Topic: Reading & write to RTC 12887 ?
Replies: 51
Views: 2016

Re: Reading & write to RTC 12887 ?

Then it seems "DS" is just a inversion of "AS". I'm not sure that's quite the case. It depends upon whether the chip is in Motorola or Intel mode from how I read the documents. But yes, 'AS' tells the chip to read an address and 'DS' to read/write data, along with 'R/W'. Oh, and yes, acronym collis...
by stephen_usher
Fri Jun 21, 2019 9:35 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 797

Re: Cartridge Port: Would a buffer board help with problems?

Well, I managed to get a 'scope onto some of the lines on the NetUSBee. The data bus signals look nice and square. On the address bus, however, although many are nice and square others look like shark fins, just about reaching 5V by the end of the pulse. Those aren't going to work well! So, yes, it ...
by stephen_usher
Fri Jun 21, 2019 4:27 pm
Forum: HARDWARE DISCUSSIONS
Topic: Reading & write to RTC 12887 ?
Replies: 51
Views: 2016

Re: Reading & write to RTC 12887 ?

Multiplexed, Bidirectional Address/Data Bus. The addresses are presented during the first portion of the bus cycle and latched into the device by the falling edge of AS. Write data is latched by the falling edge of DS (Motorola timing) or the rising edge of R/W (Intel timing). In a read cycle, the ...
by stephen_usher
Wed Jun 19, 2019 11:35 am
Forum: ELECTRONICS
Topic: Can anyone identify this part?
Replies: 7
Views: 441

Re: Can anyone identify this part?

Those yellow parts look like they're iron, so they could be magnets or mild steel. Maybe some sort of inductor for smoothing out high frequencies?
by stephen_usher
Mon Jun 17, 2019 9:17 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 797

Re: Cartridge Port: Would a buffer board help with problems?

I wonder what's causing the NetUSBee to fail on many TTs. Oh well.
by stephen_usher
Sun Jun 16, 2019 9:41 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 797

Re: Cartridge Port: Would a buffer board help with problems?

Did it help with misbehaving peripherals, such as Spectre GCR and NetUSBee?
by stephen_usher
Sun Jun 16, 2019 9:14 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 797

Re: Cartridge Port: Would a buffer board help with problems?

So, would there be a way of doing this using an external board?
by stephen_usher
Sun Jun 16, 2019 8:10 am
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 797

Cartridge Port: Would a buffer board help with problems?

The problems I had yesterday with the STE cartridge port (and previous problems on the TT) I was wondering if a solution to this would be a unit which sit in the cartridge port and did the following: Only switched on the +5V only when the voltage was stable (zenner diode?) Implemented buffering of a...