Search found 222 matches

by Silicebit.
Fri Aug 18, 2017 8:16 pm
Forum: General Discussion
Topic: CoCoMEM-512 for CoCo 3.
Replies: 1
Views: 38

CoCoMEM-512 for CoCo 3.

Do you have a Tandy color computer 3 and you are searching for a 512K upgrade? Then look at here: http://www.retrowiki.es/viewtopic.php?f=18&t=686
by Silicebit.
Sun Aug 06, 2017 11:45 pm
Forum: 6502 assembly coding
Topic: Convert a byte as hex string (to display on screen)
Replies: 9
Views: 375

Re: Convert a byte as hex string (to display on screen)

Other more simple routine. :-)

Code: Select all

; A = entry value
;
TAX
LSR
LSR
LSR
LSR
TAY
TXA
LDX table,Y
AND #$0F
TAY
LDA table,Y
RTS
;
table .byte 30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 ; 0 1 2 3 4 5 6 7 8 9 A B C D E F
;
; X = MSN ASCII char
; A = LSN ASCII char
by Silicebit.
Sun Aug 06, 2017 9:54 pm
Forum: 6502 assembly coding
Topic: Convert a byte as hex string (to display on screen)
Replies: 9
Views: 375

Re: Convert a byte as hex string (to display on screen)

Indeed it is a nice piece of code! I never manage to make the correct comparisons or use of the decimal mode for these things. :) By the way you can also use a 16-byte table (4 bit value - ascii code) and even save a few more cycles. No need for comparisons nor additions. Not sure about total cycle...
by Silicebit.
Fri Jul 14, 2017 10:49 am
Forum: Technical questions
Topic: How to install a 3" floppy drive on a modern pc?
Replies: 15
Views: 4646

Re: How to install a 3" floppy drive on a modern pc?

I have a Gotek with HxC firmware as drive A, and real 3.5" drive as drive B. Only convert .dsk files to .hfe and copy hfe to USB drive. On real Oric boot on hfe then use command BACKUP A TO B.
by Silicebit.
Tue Jul 04, 2017 5:55 pm
Forum: Hardware hacks and extensions
Topic: Box for AmpliBus.
Replies: 3
Views: 269

Re: Box for AmpliBus.

Happy to help. :)
by Silicebit.
Thu Jun 29, 2017 9:05 pm
Forum: Hardware hacks and extensions
Topic: Box for AmpliBus.
Replies: 3
Views: 269

Box for AmpliBus.

Do you want a box for your AmpliBus? You can download the STL files for 3D printer from here: http://www.retrowiki.es/viewtopic.php?f=40&t=200033156
by Silicebit.
Thu Jun 29, 2017 8:26 pm
Forum: Hardware hacks and extensions
Topic: List for Microdisc controller + Amplibus, LAST BATCH.
Replies: 9
Views: 668

Re: List for Microdisc controller + Amplibus, LAST BATCH.

Great news, PCB's quantity extended to 10 more units. :-)

Cheers.
by Silicebit.
Thu Jun 22, 2017 9:20 pm
Forum: Technical questions
Topic: Compatible transister ?
Replies: 5
Views: 396

Re: Compatible transister ?

Three transistors, TR1 in tape input circuitry (collector connected to pin 18 of VIA 6522), TR2 in keyboard interface (collector connected to pin 13 of VIA 6522) and TR3 to activate tape relay. All them working in commutation mode.
by Silicebit.
Thu Jun 22, 2017 8:23 pm
Forum: Hardware hacks and extensions
Topic: List for Microdisc controller + Amplibus, LAST BATCH.
Replies: 9
Views: 668

Re: List for Microdisc controller + Amplibus, LAST BATCH.

I forgot to put fandenivoldsk in list, he wrote a pm to me the may 17. Sorry, ibisum and Hergoth!! :-(
by Silicebit.
Tue Jun 20, 2017 10:26 pm
Forum: Technical questions
Topic: Compatible transister ?
Replies: 5
Views: 396

Re: Compatible transister ?

Yes, the BC547 can replace the BC184.
by Silicebit.
Thu Jun 15, 2017 5:15 pm
Forum: Technical questions
Topic: Transformer/ power supply
Replies: 23
Views: 1079

Re: Transformer/ power supply

Here's a picture Two voltage regulators 7805 and 7812. I'm guessing 5V and 12 V Yes. :-) There's a bridge rectifier RS402L Can't get one of these very easily. Could I substitute a similar one ? Search for GBL01. Havent' poked my probes at it. I'm a bit scared of 240V. But the interface powers up bu...
by Silicebit.
Tue Jun 13, 2017 9:13 am
Forum: Technical questions
Topic: Oric Atmos resets after a few seconds ... when not grounded
Replies: 38
Views: 10619

Re: Oric Atmos resets after a few seconds ... when not grounded

In this thread you can see an Oric with ROM: http://forum.defence-force.org/viewtopi ... 733#p15730

To use Microdisc controller with EPROM or EEPROM you can use this invention.http://retrowiki.es/viewtopic.php?f=7&t=200031702
by Silicebit.
Mon Jun 12, 2017 7:32 pm
Forum: Technical questions
Topic: Oric Atmos resets after a few seconds ... when not grounded
Replies: 38
Views: 10619

Re: Oric Atmos resets after a few seconds ... when not grounded

Hi, as promised in my welcome post here is the problem that i have with my Oric Atmos. It's a german Atmos that was sold to me as new old stock. So i bought it directly. When i got it first i measured the power adapter to check if the output voltage is too high. But it wasn't too high, nothing came...