'''printer ports<br>'''
*7 bit [[Printer Port|printer port ]] (native)*[[8bit Printer Ports|8 bit printer port ]] 6128 Plus ('''unclear''' it does not work on 464+ ???)*8 bit printer port patch ([[8255|PIO]]) ('''unclear''' is that the "[[8bit Printer Ports|Happy Computer Mod]]" using CAS_WRITE as Bit7 ???)
'''Drives<br>'''
*Atari ST 80 Track DS B-drive
*[[Dobbertin|Dobbertin]] D-DOS Double drive. Up to four drives 80 track, doublesided.
*[[Dobbertin|Dobbertin ]] X-drive]] 80 tracks, DS ('''unclear''' what is that? maybe it means a Vortex X-Drive, like those listed below ???)
*[[F1|Vortex disc drives FI-D, F1-S, F1-X, M1-D, M1-S, M1-X]]. Up to four drives 80 track, doublesided.
'''Joysticks<br>'''
*[[Analog Joysticks|Analog Joystick ]] (6128 Plus) *[[Digital Joystick Joysticks]] 1 *Digital Joystick and 2
'''Memory expansions<br>'''
'''Real-Time-Clocks'''
*dk[[Dk'tronics Real Time Clock]] ('''unclear''' is that true? the source files refer to "Happy Computer RTclock", not to "Dk'tronocs RTC ")
*Dobbertin Smart Watch (at ROM select 15)
*[[SYMBiFACE II:Realtime clock|SYMBiFACE II]]
== Additional HIDs ==