Search found 13 matches

by greghol
Sun Dec 17, 2023 2:24 am
Forum: Welcome
Topic: Greetings from Phoenix Arizona
Replies: 6
Views: 1788

Re: Greetings from Phoenix Arizona

You need a Serial USB to 5V TTL adaptor as mentioned above. What you have there is a TTL single ended RX/TX to RS422 differential RX/TX. Yes the NABU has a RS422 RX/TX driver which is half of the RS422 circuit. The other half is is what is in the picture that came with the NABU So Computer <=> USB s...
by greghol
Tue Jul 04, 2023 5:29 am
Forum: Project Suggestions & Ideas
Topic: Using the option slots
Replies: 1
Views: 1346

Re: Using the option slots

There are NABU backplane based CF card, Arduino based card and a PIC18F serial/SD cards that people have done so far in various stages. I've seen a generic protoboard for the NABU too. I have been thinking about a design for a few weeks that would adapt a RC2014/RCBus 80/40 pin card to the NABU bus ...
by greghol
Sat Jun 03, 2023 8:39 pm
Forum: Welcome
Topic: New Old User
Replies: 6
Views: 1663

Re: New Old User

Yeah, I didn't like too many pics of myself being taken as I was always self conscious about it for some reason. My mother must of snuck up on me. The wall paper is long gone. Well that wall is gone too as the new buyers took two walls in the kitchen out to make the kitchen and dining/living room on...
by greghol
Sat Jun 03, 2023 9:31 am
Forum: Welcome
Topic: New Old User
Replies: 6
Views: 1663

New Old User

I've been here early on from the start of the forum so this is long over due. Always loved HW and SW but from a gaming point of view just kinda mild. I used to play on my girlfriend's Atari 2600 as well as hitting the arcades. I have a lot of plans for the NABU with the parallel port driving SPI com...
by greghol
Sun May 21, 2023 5:18 am
Forum: Cloud CP/M
Topic: Cloud CPM woes
Replies: 15
Views: 4034

Re: Cloud CPM woes

John, Make sure you don't have any 'A' disk drive files in you 'store' directory location. 'A' disk drive should go to 'temp' directory location and it will update here if new 'A' disk images are available. For some reason I experienced what you your experiencing on the latest disk image with the ne...
by greghol
Mon May 15, 2023 4:27 pm
Forum: NABU Repair, Operations and Hacks
Topic: Nabu video
Replies: 32
Views: 6511

Re: Nabu video

BTW, to do this I am hijacking the serial out from HCCA and banging out text to see what is happening. Since I don't have any EEPROM's yet to program I am doing this by starting up the IA and the Nabu which luckily still loads the test code and runs it. Once serial data starts spitting out the HCCA...
by greghol
Sun May 07, 2023 11:31 pm
Forum: Hard Drive Interface
Topic: Hard Drive Interface Photos
Replies: 9
Views: 38893

Re: Hard Drive Interface Photos

WD1001 Datasheet/Manual for reference:
http://www.bitsavers.org/pdf/westernDig ... _Feb83.pdf

Greg
by greghol
Tue May 02, 2023 4:47 pm
Forum: Cloud CP/M
Topic: Cloud CPM F18a 80-Column
Replies: 40
Views: 17938

Re: Cloud CPM F18a 80-Column

It sure does look sharp... Yes, This is the original F18A that Hans had for sale awhile back for US$100. The MK1 should work too.

Greg
by greghol
Tue May 02, 2023 7:25 am
Forum: Cloud CP/M
Topic: Cloud CPM F18a 80-Column
Replies: 40
Views: 17938

Re: Cloud CPM F18a 80-Column

Nice!!!! :D
IMG_4817.jpg
by greghol
Fri Mar 31, 2023 11:36 pm
Forum: 8251 CPM Serial Output
Topic: 8251A introduction
Replies: 14
Views: 6083

Re: 8251A introduction

I assume I'm still running into some baudrate mis-match that the VT510 can't handle. I tried rigging up a Pico to translate the baudrates but I wasn't successful. Nabu (TX) -> (RX) RS232-TTL adapter (TX) -> (RX) Pico UART1 @ 111875 -> [ CircuitPython ] -> Pico UART2 @ 115200 (TX) -> (RX) TTL-RS232 ...