Macintosh-HW/tashtwenty
1
0
Fork 0
mirror of https://github.com/lampmerchant/tashtwenty.git synced 2024-11-22 21:31:02 +00:00
Code Issues Projects Releases Wiki Activity

update README.md with compatibility information

Browse Source
This commit is contained in:
lampmerchant 2022-03-19 15:11:38 -06:00 committed by GitHub
parent 0e76b01818
commit 7dd3c0b5a7
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
README.md
View File

@ -23,6 +23,15 @@ Due to the dearth of documentation on the DCD protocol (see below), the protocol
namely read, write, and device identification. Responses to other commands are faked. Fortunately, this seems to be enough for the
device to function properly, including formatting.
The disk drive interface relies on use of the phase lines to read and write one-bit registers. Because the microcontroller mimics the register set in code instead of programmable logic, it has a response time that is, in the worst case, approximately one microsecond. This is not fast enough for Macs with faster processors to reliably detect that the device is present. As such, it can only be used on Macintosh computers with 8 MHz 68000 processors.
Compatible Macs:
* 512k (with Hard Disk 20 INIT)
* 512ke
* Plus
* SE
* Classic
## Technical Details