In 2018, I had developed the first XoomFloppy Pro. A XUM1541, but which is 100% compatible with the ZoomFloppy and also requires the same firmware.
Over time, I had then made some improvements. So I have now attached all components on the upper side. Then I added a Centronics connector for the IEEE-488 interface, so that the usual standard GPIB cables can be used.
This made the XoomFloppy Pro II a little bit wider, and it is now 99,6 x 50,3mm (ZoomFloppy = 118,3x77,5mm). This is still within the size that is fairly inexpensive from the board manufacturers.
On the one hand there is the CBM bus known from the VIC20, C64 and C128 in form of the 6pin DIN socket. In addition, the connection for a floppy speeder with parallel cable is available as a PCB connector (analog to the user port of the C64/C128), as well as a DSUB25 connector.
Furthermore, an IEEE-488 (GPIB) interface is on board, which is also available as a platinum connector (like on the PET and CBM devices), Centronics socket and pin header (IDC connector).
Of course, only one of the two interfaces can be used at a time. So either CBM bus with additional parallel cable OR IEEE-488.
First of all, the SMD parts should be assembled in descending order of size. So first the ATMega, then the 75LS06, etc.
And only then the sockets and connectors. I have left as much space as possible between the individual components, so that even less experienced should be able to assemble this board without problems.
For overview a 3D picture of the assembled board:
The completely assembled board looks like this:
The firmware is flashed via USB analog to the ZoomFloppy. The openCBM package is required for operation. The instructions for openCBM can be found at https://opencbm.trikaliotis.net/
Here is the list of components needed. I have chosen the manufacturers as examples. Of course, compatible components from other manufacturers can also be selected.
| Quantity | Designator | Manufacturer | Manufacturer Part Number | Description |
|---|---|---|---|---|
| 1 | C5 | KEMET | C0603C105K3RACTU | KEMET 1F Multilayer Ceramic Capacitor (MLCC) 25 V 10% X7R dielectric C SMD max op. temp. +125C |
| 1 | CN1 | HARTING Technology | 09642237802 | HARTING 09 64 223 7802 Filtered D Sub Connector, Ferrite, DA, Plug, 15 Contacts, 0 F, Steel Body |
| 1 | CN2 | Wurth Electronics | 629105150521 | Socket micro-USB B 5P, 629105150521, Würth Elektronik |
| 1 | CN3 | Lumberg | 010599 06 | DIN chassis socket, right angle version, with ground contact, suitable for locking, for printed circuit boards |
| 1 | CN6 | L-Com | CIB24SRA | L-COM - CIB24SRA - CONNECTOR GPIB R/A FEMALE |
| 1 | CN7 | Samtech Inc. | TST-112-01-G-D | IEEE-488 IDC Connector Right Angle or Straight |
| 1 | D1 | Wurth Electronics | 150060BS55040 | LED BLUE DIFFUSED 0603 SMD |
| 1 | D2 | Wurth Electronics | 151033BS03000 | WURTH ELEKTRONIK 151033BS03000 LED, 3MM, BLUE, 3800MCD, 470NM |
| 1 | DZ1 | STMicroelectronics | USBLC6-2SC6 | TVS DIODE 5.25V 17V SOT23-6 |
| 1 | F1 | Littelfuse | 1206L150THWR | PTC RESET FUSE 8V 1.5A 1206 |
| 1 | R1 | Yageo | RC0603FR-0710KL | RES SMD 10K OHM 1% 1/10W 0603 |
| 1 | R8 | Yageo | RC0603FR-07220RL | RES SMD 220 OHM 1% 1/10W 0603 |
| 1 | U1 | Texas Instruments | SN74LS06DR | IC INVERTER OPEN COL 6CH 14SOIC |
| 1 | U2 | Microchip / Atmel | ATMEGA32U2-AU | ATMEL ATMEGA32U2-AU MCU, 8BIT, MEGAAVR, 16MHZ, TQFP-32 |
| 1 | Y1 | Raltron Electronics | R2016-16.000-9-1010-TR-NS1 | 16MHz ±10ppm 9pF 200Ω SMD,2.0x1.6mm SMD Crystal Resonators RoHS |
| 2 | C3, C4 | KEMET | C0603C220J5RACTU | 22.0PF 50.0V |
| 2 | R3, R4 | Yageo | RC0603FR-0722RL | RES SMD 22 OHM 1% 1/10W 0603 |
| 2 | RN1, RN2 | Yageo | TC124-FR-07100KL | RES ARRAY 4 RES 100K OHM 0804 |
| 3 | C1, C2, C6 | KEMET | C0603C104J3RACTU | KEMET C0603C104J3RACTU SMD Multilayer Ceramic Capacitor, 0603 [1608 Metric], 0.1 F, 25 V, 5%, X7R, C Series |
| 5 | R2, R5, R6, R7, R9 | Yageo | RC0603FR-074K7L | RES SMD 4.7K OHM 1% 1/10W 0603 |
The PCB can either be ordered directly from PCBWay, or you can create it yourself from the Gerber files available here.
If you liked my project, I would be very happy about a small coffee donation.
The contents of this repository, with the exception of the Docs and Software directories, are released under the following license:
- the "Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License" (CC BY-NC-SA 4.0) full text of this license is included in the LICENSE.CC-NC-BY-SA-4.0 file and a copy can also be found at https://creativecommons.org/licenses/by-nc-sa/4.0/