am1933 Posted April 3, 2014 Share Posted April 3, 2014 I am starting to think I have imagined this-but I am sure that in some obscure leaflet/catalogue there was some kind of expansion system for the 4a that provided CPM compatibility. As CPM was Z80 based in nature, I have to assume that the hardware in question had an onboard Z80, basically does anyone know if this actually existed and did the second processor provide any speed benefits to the system. Or did the infamous TMS9900 bottleneck negate any possible useful communication between the two processors? I only ask as I have a BBC micro with a Z80 second processor attached that also has an extra 64K of RAM, the machine runs considerably faster in Z80 mode as the computer in effect uses the second processor as the main processor and switches the native 6502 to handling all of the machines I/O functions. Quote Link to comment Share on other sites More sharing options...
Tempest Posted April 3, 2014 Share Posted April 3, 2014 There was a Z80 card for the PEB: http://atariage.com/forums/topic/174989-my-first-z80-card-for-peb/ 3 Quote Link to comment Share on other sites More sharing options...
am1933 Posted April 3, 2014 Author Share Posted April 3, 2014 There was a Z80 card for the PEB: http://atariage.com/forums/topic/174989-my-first-z80-card-for-peb/ Well-at least now I know that It was not a figment of my imagination. Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted April 3, 2014 Share Posted April 3, 2014 It appears that several of us on the board have one of them too, but unless OPA has the RP/M disk for it, none of us have a fully functional setup for it. . . Quote Link to comment Share on other sites More sharing options...
Gary from OPA Posted April 4, 2014 Share Posted April 4, 2014 It appears that several of us on the board have one of them too, but unless OPA has the RP/M disk for it, none of us have a fully functional setup for it. . . Sadly alot of my good invaluable ti99 stuff i collected over years is in cold storage back in Canada, here in DR I got very little in the way of TI99, Geneve stuff. -- And as such my rp/m floppies are not accessable at the moment, if they even readable anymore, -- wish i could help, there must be out there someplace, we really do need a more complete online archive of invaluable disks as backup for everyone. 3 Quote Link to comment Share on other sites More sharing options...
+InsaneMultitasker Posted April 4, 2014 Share Posted April 4, 2014 Sadly alot of my good invaluable ti99 stuff i collected over years is in cold storage back in Canada, here in DR I got very little in the way of TI99, Geneve stuff. -- And as such my rp/m floppies are not accessable at the moment, if they even readable anymore, -- wish i could help, there must be out there someplace, we really do need a more complete online archive of invaluable disks as backup for everyone. Reminds me of the Coleco Interpreter based on the Geneve GPL interpreter. Sadly, my disk of that interpreter and handful of Coleco cartridges appears to be damaged (even though the disk files read properly with no errors) as it no longer works Quote Link to comment Share on other sites More sharing options...
sometimes99er Posted January 30, 2019 Share Posted January 30, 2019 (edited) Nice show all together - about CP/M - and Microsoft. https://youtu.be/sDIK-C6dGks?t=247 Edited January 30, 2019 by sometimes99er Quote Link to comment Share on other sites More sharing options...
sometimes99er Posted February 1, 2019 Share Posted February 1, 2019 And one gets a brief look at this ... 1 Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted November 10, 2022 Share Posted November 10, 2022 @Tuxon86 see this topic for more info 1 Quote Link to comment Share on other sites More sharing options...
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