Search found 377 matches

by Pr0f
Fri Nov 15, 2019 7:58 am
Forum: General QL Chat
Topic: Beyond Super Gold Card
Replies: 64
Views: 2198

Re: Beyond Super Gold Card

... If you want to go digital use DVI as that's a sub-set of HDMI and probably doesn't have the licensing issues Yes, I wrote that already. I don't really like the DVI solution, because the connector consumes even more board width than VGA and breaks the compact Q68 case size. (And for a SGC success...
by Pr0f
Wed Nov 13, 2019 9:27 am
Forum: General QL Chat
Topic: Beyond Super Gold Card
Replies: 64
Views: 2198

Re: Beyond Super Gold Card

USB support is not trivial - even the basic primer for USB 1.1 is a good 100+ page read. It's quite an involved protocol, because it's extensible, but you can offer a limited supportability of simple devices and for those there are some microcontroller devices already programmed with the hard work o...
by Pr0f
Sat Nov 09, 2019 9:22 am
Forum: Hardware
Topic: CST RAM-Plus, large pics thereof
Replies: 5
Views: 220

Re: CST RAM-Plus, large pics thereof

Not sure if there is a schematic, but the paperwork does outline what LS TTL chips and transistor are required - I made the mods on one of these to put 4 sockets in for the eproms - seemed to work out ok with a TK2 Eprom in one of the slots.
by Pr0f
Thu Oct 24, 2019 9:15 am
Forum: Hardware
Topic: Miracle Systems Gold Card
Replies: 36
Views: 1592

Re: Miracle Systems Gold Card

tofro wrote:
pjw wrote:
tofro wrote:Easy - it's not in a QL atm, anyhow.
IMG_0877.JPG
IMG_0876.JPG
Who the heck is Dawn?


A detail that wasn't copied to the Tetroid cards ;) . Purportedly the spouse of one of the developers.

Tobias


I always wondered about that :-)
by Pr0f
Tue Oct 22, 2019 7:07 am
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 186
Views: 68360

Re: Happy Birthday!

Happy Birthday to Derek and XorA - just spotted your names at the bottom for today :-)
by Pr0f
Fri Sep 27, 2019 3:28 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM
Replies: 28
Views: 3792

Re: 74HCxx vs 74LSxx

I believe some QL emulators use the A-line instructions as a form of trap to replace I/O routines in QDOS with code that looks after the host OS functions
by Pr0f
Thu Sep 26, 2019 10:59 am
Forum: Hardware
Topic: DIY Fpu Unit for STFM
Replies: 28
Views: 3792

Re: 74HCxx vs 74LSxx

That;s just 8 FPU's !

They never did seem to extend this co processor functionality beyond memory manger and FPU - a graphics GPU co processor would have been a useful addition ;-)
by Pr0f
Mon Sep 23, 2019 7:51 am
Forum: Software & Programming
Topic: Read N bytes from a channel to a memory buffer
Replies: 7
Views: 425

Re: Read N bytes from a channel to a memory buffer

didn't Simon Goodwin's MEM device offer the ability to write to memory as a device - not entirely sure how safe this would be given that the way QL uses memory, you could be writing over anything (slave blocks, Basic, loaded drivers, and there is no memory protection as such, unless the MEM device v...
by Pr0f
Fri Sep 13, 2019 10:56 pm
Forum: Hardware
Topic: 2 ql's and roms ?
Replies: 4
Views: 381

Re: 2 ql's and roms ?

Early versions of the QL had a 3rd ROM in the ROM port and the 2 internal ROM sockets filled - these were 16K ROM's or EPROMS as the original intention was to get the OS and BASIC into 32K, but the ROM grew to 48K. The ROM dongle was moved internally, hence the piggy backed ROM's and flying lead - e...
by Pr0f
Fri Sep 13, 2019 6:23 pm
Forum: Hardware
Topic: 2 ql's and roms ?
Replies: 4
Views: 381

Re: 2 ql's and roms ?

You can also solder 2 ROM's on top of each other if they are a set, as both sockets are in fact wired the same way, but the jumpers need to be wired for the 2 ROM setup - the advantage of doing this is it keeps one ROM socket free, for QL-SD or similar interfaces.