Search found 2614 matches

by Dave
Mon Jun 28, 2021 11:23 pm
Forum: For Sale
Topic: FS: A collection of QL books
Replies: 13
Views: 1952

Re: FS: A collection of QL books

mancity1961 wrote:Hi, thanks for checking the price of postage, bit more than I can afford at the moment so I'll have to pass on them for the moment :(


If I chip in half the postage cost to the seller for you, would that make it doable for you?
by Dave
Mon Jun 28, 2021 11:03 pm
Forum: Hardware
Topic: CPU 68080
Replies: 53
Views: 4129

Re: CPU 68080

Advances in clock speed and instructions per clock move us forward some, but the extra instructions do not. The caches break a lot and often just need to be disabled. Pipelines changing can have unanticipated results for self modifying code. So I have restricted myself to experimenting with 68030 an...
by Dave
Fri Jun 25, 2021 9:45 pm
Forum: Compatibles Corner
Topic: Merlin Tonto Cartridges
Replies: 4
Views: 557

Re: Merlin Tonto Cartridges

A custom Transform case. ;)
by Dave
Thu Jun 24, 2021 5:31 pm
Forum: Software & Programming
Topic: Q68 QoE Ethernet Driver
Replies: 71
Views: 8653

Re: Q68 QoE Ethernet Driver

From the driver point of view, the ethernet peripheral will work identically* to the Q68 - only slower. I'm going to count the CPU clock, because then the interface will scale well with CPU clock. I'll need to do a little work with the logic analyzer to make sure I get the interrupts right. The sche...
by Dave
Thu Jun 24, 2021 1:03 am
Forum: Software & Programming
Topic: Q68 QoE Ethernet Driver
Replies: 71
Views: 8653

Re: Q68 QoE Ethernet Driver

A counter would be easy to implement. The choice of signals available at the CPU socket are quite limited, though.
by Dave
Wed Jun 23, 2021 5:13 pm
Forum: Software & Programming
Topic: Q68 QoE Ethernet Driver
Replies: 71
Views: 8653

Re: Q68 QoE Ethernet Driver

Ok. That's 2kHz. I can do that. Obviously it's not going to be 50% duty cycle. I need to go off and think a little to do it correctly. As a code defined ticker it can be altered later.

The ticker is an interrupt. What level interrupt should it be?
by Dave
Wed Jun 23, 2021 1:33 pm
Forum: Hardware
Topic: Multiplexer chip
Replies: 5
Views: 458

Re: Multiplexer chip

That will definitely not work in a QL.
by Dave
Tue Jun 22, 2021 6:54 pm
Forum: Software & Programming
Topic: Q68 QoE Ethernet Driver
Replies: 71
Views: 8653

Re: Q68 QoE Ethernet Driver

I have a rather massive quantity of 8Kx8 SRAMs, and can throw one on the card to give it its own private memory area for the stack. I can provide a ticker, and have provided for that. All I need is a target frequency for the ticker. I can divide it from the CPU clock or ethernet clock, or something ...
by Dave
Thu Jun 10, 2021 8:25 pm
Forum: Hardware
Topic: Mystery card reveal!
Replies: 6
Views: 557

Re: Mystery card reveal!

I just got a reply from the seller. They bought the QL in a batch of items from an estate sale. They don't have any further info. I've asked them if they can say the name or location of the estate sale. No reply as yet.
by Dave
Thu Jun 10, 2021 6:43 pm
Forum: Hardware
Topic: Mystery card reveal!
Replies: 6
Views: 557

Re: Mystery card reveal!

I'm heading out the door this evening for a road trip to Pittsburg to meet Phoebus. I'll check it out when I get back. It's a late US QL in very crisp condition that was formerly owned by a heavy smoker. Some detox required.

I'll be back around the 22nd.