| Author |
Message |
Forum: Programming Topic: Crenshaw - Let's Build a Compiler |
| BigDumbDinosaur |
|
Posted: Thu Oct 17, 2024 1:35 pm
|
|
Replies: 102
Views: 10243
|
| ... get a burr under my saddle and see if I can spin a 65C816 rendition. While a C02 rendition would run on the 816 in native mode as is—assuming no Rockwell extensions and no zero-page hinkiness in the code, some of the 816-specific features might help to compact code and improve execution speed. ... |
|
 |
Forum: Hardware Topic: -30 volts |
| jds |
|
Posted: Fri Sep 27, 2024 11:32 pm
|
|
Replies: 8
Views: 274
|
| ... a good source of 16-character VF displays if anyone is interested in them. I guess a character LCD is much easier now, but old computers like the Rockwell AIM-65 used displays a bit like this and they are getting very expensive now. Since they are very easy to interface with, apart from the power ... |
|
|
Forum: Hardware Topic: -30 volts |
| jds |
|
Posted: Thu Sep 26, 2024 4:06 am
|
|
Replies: 8
Views: 274
|
| I have purchased a module with a VF display and keypad on it, suitable for interfacing with a 6502 system (it has a Rockwell 10937 VF display controller on it, that can be controlled with two pins, clock and data). It has a 16 character segmented VF display and a 28 pin keypad, it ... |
|
|
Forum: Programming Topic: Streamlining code with JSR |
| BigDumbDinosaur |
|
Posted: Sun Sep 01, 2024 8:15 am
|
|
Replies: 18
Views: 829
|
| ... with inverted and uninverted outputs on PH1 and PH2. Now we have PHI2 as the input and PHIO1 and PHIO2 as the outputs. Adding to the confusion, Rockwell refers to these signals as Ø0 (IN) , Ø1 (OUT) and Ø2 (OUT) in their data sheet. In the narratives, they further confuse things by referring ... |
|
|
Forum: Programming Topic: Smallest native 65c02 disassembler? |
| BigDumbDinosaur |
|
Posted: Fri Aug 23, 2024 12:52 am
|
|
Replies: 39
Views: 2030
|
| ... xyabb tho I assume the choice was to align with the units hex digit?). Just means lots of special case code I guess. Adding insult to injury, the Rockwell extensions are zero page only, which limits their utility. They were developed to facilitate the use of the 65C02 in modem chipsets, which ... |
|
|
Forum: Programming Topic: Smallest native 65c02 disassembler? |
| BigDumbDinosaur |
|
Posted: Thu Aug 22, 2024 10:49 pm
|
|
Replies: 39
Views: 2030
|
| ... ...are incorrect, as 4 is an operand that represents the particular entity being tested—the instruction mnemonic is BBS . I should note that the Rockwell data sheet contradicts itself on this; the mnemonic list says one thing and the opcode table says another. In adherence to the original (and ... |
|
|
Forum: Emulation and Simulation Topic: 6502 instruction unit tests |
| Yuri |
|
Posted: Sat Aug 17, 2024 4:54 pm
|
|
Replies: 4
Views: 613
|
| ... Depending on how accurate you want to go, different variations of the 6502 will have some slightly different side effects in some cases. Rockwell NMOS vs. WDC CMOS vs. Roch 2C02 for example. |
|
|
Forum: General Discussions Topic: Self-hosting 65xx systems ... (Languages, OS, etc.) |
| BigDumbDinosaur |
|
Posted: Mon Aug 05, 2024 4:46 pm
|
|
Replies: 39
Views: 2035
|
| ... of a 6502-family MPU and perhaps some 6502-type I/O. Even there, differences between the capabilities and behavior of the NMOS 6502, the generic (Rockwell, CMD, etc.) 65C02, the WDC 65C02 and the 65C816 mean these MPUs might all be speaking 6502 machine language, but they aren’t all speaking the ... |
|
|
Forum: Hardware Topic: 6570 / 6571. What is it? |
| jds |
|
Posted: Sun Jul 21, 2024 1:01 am
|
|
Replies: 20
Views: 8527
|
| ... and a TIM monitor for development. For hobbyists it didn't really get useful until EPROM based microcontrollers became available, but really Rockwell did have some good development options. I've no idea how much they cost, they were probably expensive. I found a couple of photos of the 6500/1's ... |
|
|
Forum: Newbies Topic: 6502 + Raspberry Pi Pico Idea??? |
| Osric |
|
Posted: Sat Jul 20, 2024 7:35 pm
|
|
Replies: 9
Views: 1520
|
| ...I don't know if the Rockwell chip you are using will work properly with the clock halted, check your datasheet. All CMOS versions of the 6502 will tolerate the clock being stopped in the high phase, which is a viable method of wait-stating ... |
|
|
Forum: Newbies Topic: 6502 + Raspberry Pi Pico Idea??? |
| BigDumbDinosaur |
|
Posted: Sat Jul 20, 2024 6:48 pm
|
|
Replies: 9
Views: 1520
|
| ...I don't know if the Rockwell chip you are using will work properly with the clock halted, check your datasheet. All CMOS versions of the 6502 will tolerate the clock being stopped in the high phase, which is a viable method of wait-stating ... |
|
|
Forum: Newbies Topic: 6502 + Raspberry Pi Pico Idea??? |
| Osric |
|
Posted: Sat Jul 20, 2024 3:58 pm
|
|
Replies: 9
Views: 1520
|
| ... For starters, I'd like to just see if there is a way I can test communications between the Pico and the 6502 and work up from there. I'm using a Rockwell R65C02 if it makes a difference. Does anyone know where a good place to start with this would be and how I can work up from that? I see you ... |
|
|
Forum: Hardware Topic: 6570 / 6571. What is it? |
| BigEd |
|
Posted: Sat Jul 20, 2024 7:21 am
|
|
Replies: 20
Views: 8527
|
| Thanks! I might well guess that the Rockwell people working on 6502 cores - rather than variant chips - might have more expertise and more resources than CSG. This is evidently a new core, in the sense that there are quite deep changes to logic and layout. |
|
|
Forum: Hardware Topic: 6570 / 6571. What is it? |
| jds |
|
Posted: Sat Jul 20, 2024 2:17 am
|
|
Replies: 20
Views: 8527
|
| It looks like the MOS 6500/1 is a second sourced Rockwell R6500/1. An interesting possibility! Why would you think Rockwell are the original, and not themselves the second source? I'm at home with RSV at present, so maybe not thinking straight. However ... |
|
|
Forum: Hardware Topic: 6570 / 6571. What is it? |
| BigEd |
|
Posted: Thu Jul 18, 2024 7:58 am
|
|
Replies: 20
Views: 8527
|
jds wrote: It looks like the MOS 6500/1 is a second sourced Rockwell R6500/1.
An interesting possibility! Why would you think Rockwell are the original, and not themselves the second source?
Related recent dissection of the chip:
MOS 6571 Amiga keyboard controller dissection > 6500/1 |
|
|
| Sort by: |
Login
Register
FAQ
Search