Tim Holyoake
@timholyoake.uk
RetroComputing. Liberal Democrat. Caterham 7 Owner. In remission from Mantle Cell Lymphoma.
More often at https://oldbytes.space/@psychotimmy
Blogs at https://z80.timholyoake.uk/ , https://mcl.timholyoake.uk/ & https://railwaywalks.timholyoake.uk/
More often at https://oldbytes.space/@psychotimmy
Blogs at https://z80.timholyoake.uk/ , https://mcl.timholyoake.uk/ & https://railwaywalks.timholyoake.uk/
My 8255 rewrite seems to have fixed the keyboard weirdness & cursor blink speed issues on the #MZ700 emulation. It also seems to have sorted the glitches I still had with the #MZ80K keyboard. The new emulation is more efficient, so I may be able to drop the Pico clock speed another 10MHz or so ...
November 7, 2025 at 4:14 PM
DESQview/X is my main memory of early PCs!
November 5, 2025 at 9:40 PM
DESQview/X is my main memory of early PCs!
I think I may have found the weirdness in the keyboard handling today. Looks like I may need to rewrite my 8255 emulation as it could also be the root cause of my cursor blink speed issues. More investigation needed however. #RetroComputing #Sharp #MZ700 #PicoMZ
November 4, 2025 at 8:20 PM
I think I may have found the weirdness in the keyboard handling today. Looks like I may need to rewrite my 8255 emulation as it could also be the root cause of my cursor blink speed issues. More investigation needed however. #RetroComputing #Sharp #MZ700 #PicoMZ
Running the emulator at 200MHz is a definite improvement - it's only 2 seconds slower than the real thing for the primes up to 10,000.
#RetroComputing #Sharp #MZ700 #PicoMZ
#RetroComputing #Sharp #MZ700 #PicoMZ
November 2, 2025 at 5:10 PM
Running the emulator at 200MHz is a definite improvement - it's only 2 seconds slower than the real thing for the primes up to 10,000.
#RetroComputing #Sharp #MZ700 #PicoMZ
#RetroComputing #Sharp #MZ700 #PicoMZ
It all seems a little more intense than Ashbourne's shrovetide football!
October 30, 2025 at 12:47 PM
It all seems a little more intense than Ashbourne's shrovetide football!
Sorted out the display of the upper 256 characters today. Took longer to figure out than it should have ...
#RetroComputing #SharpMZ700 #Emulation
#RetroComputing #SharpMZ700 #Emulation
October 29, 2025 at 5:47 PM
Sorted out the display of the upper 256 characters today. Took longer to figure out than it should have ...
#RetroComputing #SharpMZ700 #Emulation
#RetroComputing #SharpMZ700 #Emulation
Using my trusty Sieve of Erastothenes program plus some trial and error, it looks as if overclocking a Pico to somewhere around 210 - 220MHz will work nicely for the #MZ700 #emulator
#RetroComputing #Emulation
#RetroComputing #Emulation
October 26, 2025 at 3:00 PM
Using my trusty Sieve of Erastothenes program plus some trial and error, it looks as if overclocking a Pico to somewhere around 210 - 220MHz will work nicely for the #MZ700 #emulator
#RetroComputing #Emulation
#RetroComputing #Emulation
Progress with the Pico #MZ700 #Emulator. Colour output works & I have a reasonable USB to MZ700 keyboard map.
Next up - timings (can I really emulate a 3.5MHz MZ700 on a Pico or is a Pico2 required) & the banked memory implementation, completely different to the MZ-80A.
#RetroComputing #Emulation
Next up - timings (can I really emulate a 3.5MHz MZ700 on a Pico or is a Pico2 required) & the banked memory implementation, completely different to the MZ-80A.
#RetroComputing #Emulation
October 25, 2025 at 5:27 PM
Progress with the Pico #MZ700 #Emulator. Colour output works & I have a reasonable USB to MZ700 keyboard map.
Next up - timings (can I really emulate a 3.5MHz MZ700 on a Pico or is a Pico2 required) & the banked memory implementation, completely different to the MZ-80A.
#RetroComputing #Emulation
Next up - timings (can I really emulate a 3.5MHz MZ700 on a Pico or is a Pico2 required) & the banked memory implementation, completely different to the MZ-80A.
#RetroComputing #Emulation
Reposted by Tim Holyoake
Please sign the petition to fund free COVID boosters for all vulnerable people this year: petition.parliament.uk/petitions/73...
Petition: Fund NHS COVID boosters for Clinically Vulnerable people – keep covid boosters
'Protect the NHS' and 'Save Lives' by continuing to fund NHS COVID boosters for Clinically Vulnerable people, including most previously shielded as CEV, rather than limiting them to over-75s, care hom...
petition.parliament.uk
October 22, 2025 at 2:46 PM
Please sign the petition to fund free COVID boosters for all vulnerable people this year: petition.parliament.uk/petitions/73...