Sharp MZ

Thank you. No dice with the Lotharek. The Sharp seeks and pops up a 'RA' message on the Lotharek display but goes no further. So frustrating. Looks like a controller issue then, perhaps make some simple voltage checks on the interface IC's, ie. IC24 (75452). IC21 (7414), IC19 (74145) as these may h...

@dat-alex - looking good, what package are you using, Quartus II schematic capture? I havent studied the differences between the 1772/1773 but I should image it wont take much effort to update the 1772 design. I will take a look soon as Im currently porting my Sharp MZ Series emulator to a Cyclone I...

Ok, will let you know, just waiting for the boards and parts. I decided to go with 74LS devices, as per the original card and ordered them from ebay so just a matter of waiting until they all arrive. I should be able to put a kit of parts together or build them and will advise accordingly. Good luck...

The link is via private message.

Schematics captured in Kicad from the original hand drawn schematic.
Did you get the link as it still seems stuck in my outbox?

This is just a test of the GAL (to replace the PAL) in the original board. The new boards are almost the same (different routing and copper fills) so I dont expect any gotcha's, made several tests to verify the hand drawn schematic against the physical card. Just waiting for the parts to arrive, hop...

Link sent. I like the teensy devices, pjrc were the inspiration for me using the K64F on the 3.5 module rather than the usual ST32 mpu suspects! Would be good if you complete the project to share it. The MZ-800 and MZ-2000/2200 share the same floppy interface so very useable. I'm just in the process...

Yep, should be as it is quite simple, especially compared to the Sharp disk interfaces. The Sharp devices use a lesser WD Floppy Disk controller and therefore need the data separators and filters etc. Hopefully the boards will arrive next week.

Hi alo2004, I can create you a zip file and PM you a link tomorrow. If you have the floppy disk interface, then the disk pack on original.sharpmz.org -> Download -> MZ80B->Operating Systems - at the bottom of the screen is very useful. Once you have CP/M running you immediately have all the assemble...

Tested the SFD800 on the MZ-80B today using the HxC, an ASUS twisted floppy cable, the disk images from original.sharpmz.org and the new GAL and as can be seen, everything works, CP/M + DISK BASIC SB-6511. If you dont have joy with your HxC then the Floppy Disk Interface card will be the culprit. MZ...