Search found 1298 matches

by Pr0f
Thu Jan 11, 2024 9:56 am
Forum: Compatibles Corner
Topic: ICL OPD
Replies: 180
Views: 166821

Re: ICL OPD

And I agree Stephen - the OPD is strange!
by Pr0f
Thu Jan 11, 2024 9:55 am
Forum: Compatibles Corner
Topic: ICL OPD
Replies: 180
Views: 166821

Re: ICL OPD

Is David still contactable?
by Pr0f
Thu Jan 11, 2024 8:25 am
Forum: Compatibles Corner
Topic: ICL OPD
Replies: 180
Views: 166821

Re: ICL OPD

On the subject of programs - does anyone have any information / ROM cartridge images for any sofware that provides serial interface for the ICL OPD? I know there was the 64180 based CPM module which supported disks and a serial port, I also know there was a unit based on a 80C31 which provided a DB2...
by Pr0f
Wed Jan 10, 2024 10:08 pm
Forum: Compatibles Corner
Topic: ICL OPD
Replies: 180
Views: 166821

Re: ICL OPD

The issue with BASIC is that it doesn't fit in the 32K ROM slot size. The Telestore hacked things and fitted it in two 32K ROM slots. RAM expansions have to pretend to be ROMs in the ROMpack and then have code which hacks the OS into ignoring the "BAD ROMs" and telling where the extra RAM...
by Pr0f
Wed Jan 10, 2024 9:42 pm
Forum: Compatibles Corner
Topic: ICL OPD
Replies: 180
Views: 166821

Re: ICL OPD

That's great news ! I am waiting on some parts to get power and video working for my base unit (I got no monitor), and once I've got the setup at least giving me some video - I plan on porting ICL basic to a ROM and seeing if it can be made to be available without having to be loaded up from cartrid...
by Pr0f
Wed Jan 10, 2024 11:13 am
Forum: Hardware
Topic: Solid State Microdrive Cartridge?
Replies: 18
Views: 1302

Re: Solid State Microdrive Cartridge?

That was also my understanding - that if the QL was writing data - it would be present on the head, and would not be there if we were reading - it would expect the tape to be providing it. Since the QL would normally spin up the tape before attempting to write anything, and as I understand it - it n...
by Pr0f
Tue Jan 09, 2024 3:04 pm
Forum: Hardware
Topic: Solid State Microdrive Cartridge?
Replies: 18
Views: 1302

Re: Solid State Microdrive Cartridge?

Or perhaps a custom magnetic, but it would need to be 2 tracks. The other issue is power to the unit, as it would need to be battery powered most likely and a likely power source would be a 3v lithium cell. I suppose the motor would only need to drive an encoder wheel or something to give the tape m...
by Pr0f
Mon Jan 08, 2024 2:58 pm
Forum: Hardware
Topic: White screen problem
Replies: 3
Views: 453

Re: White screen problem

Probably one or more of the memory chips on the board is not making good contact with the socket - you could carefully take each one out and reseat them in the socket - if the pins look a little tarnished - give them a gentle rub with some contact clearner before reseating them in the sockets. Hopef...
by Pr0f
Sat Jan 06, 2024 10:09 pm
Forum: Compatibles Corner
Topic: ICL OPD
Replies: 180
Views: 166821

Re: ICL OPD

This entry on RWAP site: https://rwapsoftware.co.uk/oneperdesk/technical_info.html 5. ICL MODIFICATIONS The following modifications have been seen on the mainboard. 5.1 C10 changed from a 220n, 40v tantalum to a 220n film capacitor in series with a 1ohm resistor 5.2 R47 changed from a 1Kohm resistor...