Search found 1306 matches
- Thu Jan 11, 2024 8:25 am
- Forum: Compatibles Corner
- Topic: ICL OPD
- Replies: 180
- Views: 168544
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...
- Wed Jan 10, 2024 10:08 pm
- Forum: Compatibles Corner
- Topic: ICL OPD
- Replies: 180
- Views: 168544
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...
- Wed Jan 10, 2024 9:42 pm
- Forum: Compatibles Corner
- Topic: ICL OPD
- Replies: 180
- Views: 168544
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...
- Wed Jan 10, 2024 11:13 am
- Forum: Hardware
- Topic: Solid State Microdrive Cartridge?
- Replies: 18
- Views: 1321
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...
- Tue Jan 09, 2024 8:47 pm
- Forum: Hardware
- Topic: Solid State Microdrive Cartridge?
- Replies: 18
- Views: 1321
- Tue Jan 09, 2024 3:04 pm
- Forum: Hardware
- Topic: Solid State Microdrive Cartridge?
- Replies: 18
- Views: 1321
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...
- Mon Jan 08, 2024 2:58 pm
- Forum: Hardware
- Topic: White screen problem
- Replies: 3
- Views: 464
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...
- Sat Jan 06, 2024 10:09 pm
- Forum: Compatibles Corner
- Topic: ICL OPD
- Replies: 180
- Views: 168544
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...
- Sat Jan 06, 2024 8:41 pm
- Forum: Compatibles Corner
- Topic: ICL OPD
- Replies: 180
- Views: 168544
Re: ICL OPD
On my bare board - the powerdown pin hit's the gates of three of those FETS - the small square items labelled FT1 - FT6, If you have the scanned schematics - there is a readable circuit diagram for the power delivery section - 'page 143' - the FET's are FT1 (controls the relay on the main board), FT...
- Sat Jan 06, 2024 6:48 pm
- Forum: Compatibles Corner
- Topic: ICL OPD
- Replies: 180
- Views: 168544
Re: ICL OPD
I've updated the Decoding notes - latest one attached - there a good few corrections and some further lines identified. The powerdown pin on the J3 connector on the main board is indeed used to gate CE2 on the SRAM along with controlling the power to the whole board. Enjoy the latest updates - I've ...